LWoo Associates


patentspublicationscapabilitiestraining courses

Book Chapters

 

“Selecting materials for Medical Products”, Sherwin Shang and Lecon Woo, Handbook of Materials Selection, Myer Kutz Ed., Chapter 38, 1195-1222,  John Wiley, New York, (2002)

“Relevance of High Temperature Oxidative Stability Testing to Long Term Polymer Durability”, L. Woo, Atul Khare, Craig Sandford, Michael T.K. Ling and Samuel Y Ding,  Proceedings of the 12th International Congress on Thermal Analysis and Calorimetry Vol II, Toft Sorenso, Juul Moller, eds, 539-548, Adademiai Kiado, Budapest (2001).

“Polypropylene Degradation and Durability Estimates Based on the Master Curve Concept”, L. Woo, Michael T. K. Ling, Atul R. Khare and Y. Samuel Ding, 499-506, in Ageing Studies and Lifetime Extension of Materials, L. Mallinson ed., Kluwer Academic/Plenum Publishers, New York, (2001)

“Short Chain Branching Distribution of Amorphous Ethylene Copolymers”, L. Woo, Michael T. K. Ling, Atul khare, and Stanley P. Westphal, Chapter 10, p.151-162, Olefin polymerization, Emerging Frontiers, P. Arjunan, J. McGrath, T. Hanlon, eds. ACS Symposium Series 749, American Chemical Soc. Washington, DC, 2000

“Further Studies on Metallocene ULDPE/PP Blends Impact –Morphology Relationships”, Stanely Westphal, Michael T. K. Ling, Samuel Ding, and L. Woo, 135-141, Metallocene Catalysed Polymers, G. Benedikt, B. Goodall Eds, SPE, Plastics Design Library, New York, 1998

“ Further Studies on Oxidative Induction Test on Medical Polymers”, L. Woo, Samuel Y. Ding, Michael T. K. Ling, and Stanley P. Westphal, Oxidative Behavior of Materials by Thermal Analytical Techniques, p. 44-57, ASTM STP 1326, A. T. Riga and G. H Patterson, Eds., Am. Soc. of Testing Materials, Philadelphia, (1997).

“ Study on the Oxidative Induction Test Applied to Medical Polymers”, L. Woo, S. Y. Ding, M. T. K. Ling and S. P. Westphal,Proceedings of the 11th International Congress on Thermal Analysis and Calorimetry, Vol. I,  131-138, M. Keating Ed., John Wiley Ltd,Chichester (1997)

" Advanced Testing Methods for Biomaterials"; L. Woo, Michael T. K. Ling and Wilson Cheung, High Performance Biomaterials, p.91-123, M. Szycher, Editor, Technomic Press, Lancaster, PA, (1992).

 " Application of the Oxidative Induction Test to Medical Polymers"; L. Woo, Michael T. K. Ling, and Eddie Chan, Thermochimica ACTA, Vol.192, p. 209-219,  A. Riga, Editor, Elsevier, Amsterdam, (1991).

" Physical Aging Studies in Amorphous Polyethylene Terephthalate (PET) Blends"; L. Woo and Wilson Y. Cheung, Thermochimica ACTA vol. 66, p. 7792, A. Riga and M. Neag, Editors, Elsevier, Amsterdam, (1990).

 " Recent Advances in Medical Plastics"; L. Woo, Craig Sandford, and R. Walter, in Advances in Biomaterials, p. 53, S. Lee Editor, Technomic Press, Lancaster, PA, ( 1987).

 "Study on Adhesive Performance by Dynamic Mechanical Techniques"; L. Woo in Analytical Calorimetry, vol. 5, p.155, J.F. Johnson and P. S. Gill Editors, Plenum Press, New York, (1984).


Invited Presentations and Reviewed Publications

 

“Long term Polyurethane Catheter Alcohol Compatibility I, Physical and Rheological studies”, Lecon Woo,  John Wesley MD, Maryellen Zibell, Christopher Gardner and William Anderson, Soc of Plastics Eng ANTEC (2010)

“Thermal Oxidative Stability Tests, a Re-examination” L. Woo, V. Krongauz, B. Eu, Soc. of Plastics Engineers ANTEC Proceedings, Milwaukee, 2008

 “Oxidative and Hydrolytic Stability Studies on Medical Thermoplastics Polyurethanes”, L. Woo and W. Anderson. Soc. of Plastics Engineers ANTEC Proceedings, Milwaukee, 2008 

“Multi-Phase Polymers – Opportunities and Considerations for Medical Devices”, Invited Lecture, Medical Device and Manufacturing West Conference, Anaheim, 2008

“Kinetics of dihydro-dibenzazepine Derivatives Sublimation”, V.V. Krongauz, L. Woo et al, Thermochimica ACTA, 457 p35-40, (2007)

“Scientific Optimization for Medical Elastomer Performance”, Invited lecture, International Medical Device Technology Conference , BirminghamUK, Feb, (2004)

“Medical Device Failures and Prevention” Invited lecture, International Medical Device Technology Conference, BirminghamUK, Feb, (2003)

“Application and Considerations of Chemiluminescence in Polymer Degradation Studies”, L.Woo, Craig L. Sandford, Henk Blom, Journal of Applied Medical Polymers Vol 6, No2, 58-63, (2002)

“Use of a CCD imager for simultaneous DSC-Chemiluminescence and multiple sample polymer degradation studies”  L. Woo, Craig Sandford, Henk Blom and Y. Samuel Ding, Thermochimica ACTA 392-393 23-27 (2002)

“Comparison of electron beam irradiation with gamma processing for medical packaging materials”, L. Woo, Craig L. Sandford, Radiation Physics and Chemistry, vol 63, 845-850, (2002) 

“Evidence for a Master Curve Behavior for Polypropylene (PP) Degradation and Durability”, Samuel Y Ding, Craig L. Sandford, Michael Ling, Atul Khare and L. Woo, Journal of Applied Medical Polymers, Vol. 5, #2, p80-87, (2002)

“Advances and Opportunities in Sterilization Modality and Interaction with Medical Materials” L. Woo and K. S. Purohit, Invited Lecture, International Medical Device Technology Conference, Birmingham, UK, (2002).

“Surface Delamination of an Injection Molded Medical Device Using Flexible PVC”, Tahua Yang, Sherwin Shang, L. Woo et.al, Journal of Applied Medical Polymers, Vol.5, #2, p55-58 (2002)

“Thermal, mechanical, and rheological comparison of stereoblock flexible polypropylenes”, Atul R. Khare, Samuel Y. Ding, Michael T.K. Ling, Chuan Qin, and L. Woo, Thermochimica ACTA Vol.367-368 119-124 (2001).

“Polyolefin Durability Estimates by Oxidative Stability Testing”,L. Woo, Craig L. Sandford, Samuel Y. Ding, ACS Polymer Preprints, 42(1) (2001).

“Relevance of high temperature oxidative stability testing to long term polymer durability”, L. Woo, Atul Khare, Craig L. Sandford, M. Ling, and Samuel Y. Ding, J. Thermal Analysis and Calorimetry, 64, 539-548, (2001).

“Application of the oxidative induction test to depolymerizing systems”, L. Woo, Atul Khare, Henk P. Blom, Craig Sandford, Samuel Y. Ding, Thermochimica ACTA, vol 367-368, 113-118,(2001).

“Prevention of medical devices failure and degradation during processing”, Michael T. K. Ling, Craig Sandford, Adel Sadik, Henk Blom, Samuel Y. Ding and Lecon Woo, Plastics Engineering, Vol.1, 50-55, (2001).

“Polymer durability estimates based on apparent activation energies for thermal oxidative degradation” Samuel Y. Ding, Atul Khare, M.T. K. Ling, Craig L. Sandford and L. Woo Thermochimica ACTA, 367-368,107-112 (2001).

“Medical Kink-Resistant Tubing”, S. Shang, E. Chim, T. Yang, L. Woo, Journal of Applied Medical Polymers, 66-71, Vol.4/ No.2, (2000).

“Radiation Resistance of Multilayer films by Instrumented Impact Testing”, R. Wojnarowski, M. T. K. Ling, A. Khare, and L. Woo, Journal of Applied Medical Polymers, 56-60, Vol.4/ No.2, (2000).

“Failure Mechanism and Progression of Irradiated Polypropylene and other Medical Polymers”, Michael T. K. Ling, Samuel Y. Ding, Atul Khare, Craig L. Sandford, and L. Woo, Journal of Applied Medical Polymers, spring, Vol.4, #1, p20-27, (2000).

“Durability of a Reference Material over Diverse Conditions”, Samuel Y. Ding, Michael T. K. Ling, Atul R. Khare, and L. Woo, Thermochimica ACTA 358, p147-153 (2000).

“Thermal and Dynamic Mechanical Analysis on Metallocene ULDPE/PP Blends to Optimize Impact Properties”, Atul R. Khare, Stanley P. Westphal, Michael T. K. Ling, Chuan Qin, and L. Woo, Thermochimica ACTA, 358, p155-160, (2000).

“Flow, Pressure, Temperature Dependence of Oxidative Induction Time (OIT) Measurements on a Heat Flow DSC”, Samuel Ding, Michael T.K. Ling, Atul R. Khare, Craig Sandford, and L. Woo, Journal of Applied Medical Polymers, Spring 2000, Vol.4, #1, 28-37 (2000).

“Thermal and Dynamic Mechanical Analysis on Metallocene ULDPE /PP Blends to Optimize Impact Properties”, Atul R. Khare, Stanley P. Westphal, Michael T.K. Ling, Chuan Qin and Lecon Woo, Thermochimica ACTA, 357, p155-160 (2000).

“Radiation Sterilization Compatibility of Medical Packaging Materials”, Sherwin Shang, Michael T. K. Ling, Stan Westphal, and L. Woo, Journal of Applied Medical Polymers, p. 44-49, Vol.3#2 (1999).

“Polypropylene Degradation and Durability Estimates Based on the Master Curve Concept”, L. Woo, Michael Ling, Atul Khare, and Y. Samuel Ding, Proc. International Conference on Aging Studies and Lifetime Extension of Materials, OxfordUK, (1999).

“The Quest For High Temperature Flexible Polymers For The Medical Industry”, L. Woo, Invited Lecture, Proc. Medical Device and Technology Conference, p. 101-111, London, UK.(1999).

“Manufacturing Process Enhancements for Polyolefin Based Medical Products”, L. Woo, T. Yang, and Sherwin Shang, p.417-425, Proceedings Am. Inst. Chem. Engr. National Meeting, HoustonTX (1999).

“ Medical Device Processing Development Based on Rheology and Thermal Analysis”, Stanley P. Westphal, Atul R. Khare, Michael T. K. Ling, and Lecon Woo, Thermochimica ACTA, 324, 175-178(1998). 

“ Effect of Ionizing Radiation on the Thermal Oxidative Stability of Medical Polymers”, L. Woo, Michael T.K. Ling, Samuel Y. Ding, andStanley P. Westphal, Thermochimica ACTA, 324/1-2, 179-185, (1998).

“Optimizing Performance of Metallocene ULDPE Modification for Medical Applications”

L. Woo, Invited Lecture, Proceedings of Polypropylene’98 International Conference, Session IX, 4-1. Zurich, (1998).

“Short Chain Branching Distribution of Amorphous Ethylene Copolymers”, L. Woo, S. P. Westphal, T.K. Ling, and A. R. Khare, Am. Chem. Soc. Polymer Preprints, 39#1, p.203 (1998).

“Global Medical Material Opportunities and Challenges for The Next Millennium”, Invited Lecture, Medical Device Technology Conference, LondonUK, Conference Proceedings 11-24 (1998).

"Variations on the Oxidative Induction Testing Methodology for Medical Polymers", L. Woo, Michael T. K. Ling, Stanley P. Westphal, and Samuel Y. Ding, J. Vinyl and Additive Technology, 3, #4, 1-5, (1997).

“Study on the Oxidative Induction Test Applied to Medical Polymers”, L. Woo, S. Y. Ding, M. T. K. Ling and S. P. Westphal, Journal of Thermal Analysis, Vol. 49, 131-138 (1997)

“ Sterilization Compatibility and Shelf-life Predictions for Medical Devices”, Invited Lecture, 4th International Medical Design and Materials Conference, London, United Kingdom, Conference Proceedings, p.140-150, (1997).

“ The Corporate Perspective and Advanced Aging Techniques”, Invited Lecture, Proceedings of MDM Conference, on Predicting Shelf Life From Accelerated Aging Data, 108, 45, (1997).

 “ Further Studies on Oxidative Induction Test on Medical Polymers”, L. Woo, Samuel Y. Ding, Michael T. K. Ling and Stanley P. Westphal ASTM Symposium on Oxidative Behavior of Materials by Thermal Analytical Techniques, New Orleans, (1996).

“ Relating Dynamic Mechanical Data to Flexible PVC Low Temperature Performance”, L. Woo, Stanley P. Westphal, Sherwin Shang, and Michael T. K. Ling, Thermochimica ACTA, 284, 57-66, (1996).

“ Study on the Oxidative Induction Test Applied to Medical Polymers”, L. Woo, Samuel Y. Ding, Michael T. K. Ling, and Stanley P. Westphal, Proceedings Intl. Calorimetry and Thermal Analysis Conference, P.333, (1996).

“Shelf-Life Prediction Methods and Applications”, Lecon Woo, J. Palomo, Michael T. K. Ling, and C. Sanford, Medical Plastics and Biomaterial, Vol.3, #2, p., (1996).

“ Metallocene Properties and Potential ”, L. Woo Medical Device Technology (United Kingdom), Vol. 9, p.22, (1996).

 “ Explaining Ductility Loss in Steam-Sterilized Polycarbonate”, K. Z. Hong, Chuan Qin, and Lecon Woo, Medical Plastics and Biomaterials, Vol.3, #3, p. 14, (1996).

“ Flexible Packaging For Healthcare Industry: What’s Ahead? “, L. Woo and Sherwin Shang, Invited Lecture, FlexPac’96, Chicago, (1996).

“ Phase Morphology and Performance Origins of Metallocene ULDPE/ PP Blends”, L. Woo and Stanley P. Westphal, Invited Lecture, World Wide Metallocene Conference, Metcon’96, Houston (1996).

“ Thermal and Morphological Comparisons of Blends of Metallocene and Ziegler-Natta Ultra Low Density Polyethylene (ULDPE) with Polypropylene (PP), L. Woo, Stanley P. Westphal, and Michael T. Ling,  ACS Polymer Preprints, vol.37, #1, 273, (1996).

“ The Impact of the Metallocene Revolution on Medical Industry”, L. Woo, Invited Lecture, International Medical Design and Materials Conference, LondonUnited Kingdom (1996).

" Polyethylene Structural Heterogeneity by Thermal and Rheological Techniques", Stanley P. Westphal, Michael T. K. Ling, and Lecon Woo, Thermochimica ACTA, Vol. 272, 181, (1996).

" Dynamic Mechanical Analysis (DMA) and Low Temperature Impact Properties of Metallocene Polyethylenes", L. Woo, Michael T. K. Ling, and Stanley P. Westphal, Thermochimica ACTA, vol. 272, 171, (1996).

" Prospect for Material Substitutions in the Medical Market", L. Woo, Invited Lecture, Metcon'95, World Wide Metallocene Conference, Session II, HoustonTX, 1995.

" Metallocene ULDPE and Modified PP vs. PVC for Low Temperature Medical Applications", L. Woo, invited lecture, Proceedings of International Congress on Metallocene Polymers, Brussels, Belgium, 191, 1995.

" Dynamic Mechanical Studies on Secondary Relaxations of Ethylene Copolymers", L. Woo, Michael T. K. Ling and Stanley P. Westphal, Thermochimica ACTA, 243/2, p.147-154, (Sept 15, 1994).

" Properties of Ultra Low Density Polyethylenes", L. Woo, T. K. Ling, and Stanley P. Westphal, Journal of Plastic Film and Sheeting10/2, p. 116-134, (April, 1994).

" Dynamic Mechanical Analysis and the Relationship to Impact Transitions", L. Woo, Stanley Westphal, and Michael T. K. Ling, Polymer Engineering and Science, 34/5, p.420-427, (March 1994). 

" Mechanical Spectroscopy and Impact Performance of Metallocene ULDPEs", L. Woo, Stanley Westphal, and Michael T. K. Ling, Am. Chem. Soc., PSME Preprints 71, 611, (1994). 

" Structure and Performance of the New Generation of Polyethylenes", L. Woo Soc. Mechanical Engineers, Cincinnati, (1994).

" Low Temperature Impact Property of Metallocene ULDPE", L. Woo, MetCon'94, #5, (1994).

" Structure and Properties of Ultra Low Density Polyethylenes", L. Woo, Stanley P. Westphal, and Michael T. K. Ling, Thermochimica ACTA, Vol. 226, p. 85-98, (1993).

" Thermoplastic Elastomer Behavior of Ultra Low Density Polyethylenes for Medical Applications", L. Woo, Invited Lecture, SPO'93 Intl. Conference, p. 254, (1993).

" Secondary Relaxations of Polyethylene Copolymers", L. Woo, Invited Lecture, Penn State Polymer Symposium, (1993).

"Global Medical Materials for the 90's", L. Woo, Invited Lecture, PolyMed 93, p. 3, (1993).

" Sub-ambient Relaxations of Polyethylene Copolymers", L. Woo, Michael Ling, and Stanley P. Westphal, Am. Chemical Soc. PMSE Vol. 69, p. 316, (1993).

"ULDPE for the Medical Industry: a Structure-Property Comparison", L. Woo, T.K. Ling, SP Westphal, Proceedings of Polyolefins VIII Intl. Conference, Houston, TX, p. 242, (1993).

"Failure Prevention for Injection Moulded Medical Devices", L. woo, M.T. K. Ling, S. P. Westphal, Engineering Plastics, Vol. 6, p. 175, (1993).

" Failure Free Injection Molding of Medical Devices", L. Woo, Stanley P. Westphal, and Michael T. Ling, Plastics Engineering, vol. 9, p. 29, (1992).

" Model Simulation of Radio Frequency Heatseal Performance of Flexible PVC and Other Materials", Michael T. K. Ling, Stanley P. Westphal, and Lecon Woo, J. of Vinyl Technology, Vol.14-4, p.1, (1992).

" Cryogenic Impact Properties of Medical Packaging Films"; L. Woo and Michael T. K. Ling, Journal of Plastic Films and Sheetings, Vol. 8-1,  p. 11, (1992).

" Application of the Oxidative Induction Test to Medical PVC and Other Polymers"; L. Woo, Michael T. K. Ling, and E. K. Chan, Journal of Vinyl Technology, vol. 13, No.4, p. 199 (1991).

" Considerations for Injection Molding Medical Plastics "; Invited Panelist, Medical Design and Manufacturing Conference, New York, N. Y., (1990).

" Influence of Physical Aging on Medical Plastics Properties"; L. Woo and Wilson W. Cheung, J. of Vinyl Technology, Vol. 11, no. 3, p. 121, (1989).

" Design Considerations in Polyolefin Medical Packaging "; Invited Speaker, Proceedings of SP'89 Conference on Polyolefins, Zurich, Switzerland, p. 376, (1989).

" Degradation Mechanisms During and Post Gamma Irradiation"; Invited Lecture, Medical Design and Manufacturing West Conference, Anaheim, CA. Jan. 17, 1989.

" Shelf-life Prediction of Radiation Sterilized Polymeric Materials"; L. Woo, C. Sandford, Int. Journal of Radiation Physics and Chemistry, vol. 31, p. 671, (1988).

" Failure Analysis of Rigid Vinyl"; L. Woo, Michael T.K. Ling, and Wilson Y. Cheung, Journal of Vinyl Technology, Vol.10-4, p.210 (1989).

"Controlling Factors for Shelf-life of Radiation Sterilized Medical Devices"; L. Woo and Craig Sandford, Invited Speaker, Proceedings of Medical Plastics '89 International Conference, Copenhagen, Denmark, p. 26, ( 1987).

" Polyolefin Structure Properties in Biomedical Applications"; Invited Seminar Lecture, Material Science Department, Northwestern Univ. April 29, 1987.

"Baxter Product Development Based on Material Knowledge"; Invited Keynote Speaker, Baxter Technical Symposium, Oct. 14, 1986.

"A New Dynamic Mechanical Analysis (DMA) Instrument for Polymer Analysis"; R. Blaine, P. Gill, R. Hassel, and L. Woo. Journal of Appl. Poly. Science, Appl. Polym. Symp. 34, p. 157-171, (1978).

"Polymer Characterization by Dynamic Mechanical Analysis", Roger Blaine and L. Woo, Soc. of Plas. Engineers ANTEC, p. 503, (1977).

"Stress Relaxation and Fiber Tension Measurements in Thermal Analysis", L. Woo, P.S. Gill, and R. Hassel, North American Thermal Analysis Soc. Proceedings, (1975).

"Routine Analysis of Thermosets by Dynamic Mechanical Analysis", L. Woo, R.L. Hassel, Proceedings Pittsburgh Conf. on Anal.Chem. & Apl. Specro. p. 524, (1976).

"New Dynamic Mechanical Analysis System for Polymer Properties Characterization", R. Blaine, L. Woo, FACSS, (1976).

"Dynamic Mechanical Analysis of Polymers", P.S. Gill, L. Woo, Proceed. Pitt. Conf. p. 56, (1976).

" Recent Advances in Thermomechanical Analysis of Polymers", P.S. Gill, R. L. Hassel, L. Woo, Proceedings Pitt. Conf. p. 62, (1975).

" Precision Thermomechanical Analysis as Applied to Polymer and other Systems", L. Woo, Proceedings Pittsburgh Conf. p. 376, ( 1975).

"A Digital Microwave Frequency Lock System", L. Woo, D.H. Levy, Rev. Sci. Instr. vol. 44,-6, p.732, (1973).

Symposium Presentations and Contributed Abstracts

Over 75 papers

Biblio-Abbr1 9-2007