Thermoplastic Elastomers

1987 ◽  
Vol 60 (3) ◽  
pp. 83-117 ◽  
Author(s):  
Norman R. Legge
Keyword(s):  
New Technology ◽  
American Chemical Society ◽  
Thermoplastic Elastomer ◽  
Chemical Society ◽  
Thermoplastic Elastomers ◽  
Technology Process ◽  
History Of ◽  
Chemistry Division ◽  
Successful Innovation ◽  
The Impact

Abstract It is a great pleasure to return to Montreal to receive the Charles Goodyear Medal at this joint meeting of the American Chemical Society, Rubber Division, and the Rubber Chemistry Division, Chemical Institute of Canada. This occasion has given me a delightful opportunity to renew old friendships in both organizations and to visit again my graduate school at McGill. First of all, I thank the Awards Committee and the Executive Committee of the Rubber Division for electing me to this high honor which I share with my many collaborators who were with me during those exciting years, and with the Shell Companies. The subject of the lecture is “Thermoplastic Elastomers,” specifically the triblock copolymers based on styrene and dienes, or hydrogenated dienes. Previously I have used the subtitle, “A Successful Innovation,” where I have defined “innovation” as the successful commercialization of a new technology, process, or product. In this lecture, I shall discuss the background of the innovation, the impact of it upon the thermoplastic elastomer field, and some of the early history of thermoplastic elastomers, which I believe you will find interesting.

Thermoplastic Elastomers—Three Decades of Progress

1989 ◽  
Vol 62 (3) ◽  
pp. 529-547 ◽  
Author(s):  
N. R. Legge
Keyword(s):  
Growth Rate ◽  
Physical Properties ◽  
Low Cost ◽  
American Chemical Society ◽  
High Volume ◽  
Chemical Society ◽  
Thermoplastic Elastomers ◽  
Component Integration ◽  
History Of ◽  
Processing Techniques

Abstract In these three decades of progress, thermoplastic elastomers have risen in 1987 to a position of tenth in the order of commercial thermoplastic sales in the U.S.A., with a growth rate, 1986–1987, of 9.7%. It is very probable that the quantity shown for 1987 sales, 441 million pounds, is low, since it is well known that the largest producer of styrenic TPEs does not report offtake data. Much of the styrenic TPE goes to the adhesive industry, which also is very secretive in regard to materials consumption information. Thus, the 1986–1987 reported growth rate of 9.7% is on the low side. Another indicator of progress in the growth of TPEs has been illustrated by the number of product introductions from January 1986 to June 1987. During that period, TPEs led the major thermoplastics with the introduction of 270 new product types, and the nylons were a close second with 250. A third estimate of the explosive growth in TPEs may be seen in Table V which lists the number of manufacturers of TPEs in 1975, 1985, and 1987, increasing from 10 to 28 to 50. To summarize, the present thermoplastic elastomers, now high-volume commercial products, had roots in the chemistry and technology of polymers in the 1920's. Throughout the history of the “Roots” period one can detect precursor events from which several TPEs could have been foreseen. In each of the three decades of progress, major advances were made in the technology, physical properties, availability, and utilization of TPEs. The numbers of these increased in each succeeding period. Several paradigms appear in this review, for example: 1. The triblock styrene-diene A-B-A copolymers, morphology, and elastomeric character, in the first decade. 2. The copolyesters with (A−B)n morphology and greatly enhanced physical properties in the second decade. 3. The dynamically-vulcanized blends of EPDM and PP, followed in time by the concept of compatibilization to permit practical blends of NBR and PP in the third decade. Throughout these periods, growth was catalyzed by the favorable economics of manufacturing finished elastomeric products via low-cost thermoplastic processing techniques as compared with thermoset rubber processes. The reuse of scrap also provided a major incentive. In addition to these, the concept of component integration is now showing a path toward even more cost reduction incentives. New applicational areas continue to appear. One of these, blending relatively small amounts of TPEs with existing large volume thermoplastics, promises to provide extremely large offtakes of TPEs in the next decade. I am sure that the numbers of papers presented in symposia at meetings of the Rubber Division of the American Chemical Society confirm the continued explosive growth of TPEs we have seen in these past three decades.

Weed Science in the 1990s: Will It be Forward or in Reverse?

1990 ◽  
Vol 4 (3) ◽  
pp. 671-689 ◽  
Author(s):  
Homer M. Lebaron
Keyword(s):  
Working Group ◽  
New Technology ◽  
Resistance Management ◽  
Basic Research ◽  
American Chemical Society ◽  
Chemical Society ◽  
Research Society ◽  
Plant Management ◽  
Weed Science ◽  
Scientific Publications

Dr. Homer M. LeBaron is Senior Research Fellow in the New Technology and Basic Research Department of CIBA-GEIGY Corporation, where He has the responsibility for coordinating and directing outside basic research on all of CIBA-GEIGY agricultural products. He has been employed in various R&D positions with Geigy and CIBA-GEIGY for 27 years. From 1960 to 1964, Dr. LeBaron was employed as a plant physiologist at the Virginia Tech Experiment Station in Norfolk, Virginia, mainly researching weed problems in vegetables and fruit crops.LeBaron was born May 13, 1926 in Southern Alberta, Canada, the third in a family of 10 children, and grew up on a diversified irrigation farm. He obtained his B.S. and M.S. degrees from Utah State University in 1955 and 1957. He received his Ph.D. degree from Cornell in 1960.LeBaron, in addition to WSSA, is a member of the American Society of Agronomy, American Chemical Society, Entomological Society of America, American Phytopathological Society, CAST, Sigma Xi, Aquatic Plant Management Society, European Weed Research Society, and all of the regional weed science societies.He has held numerous positions in several of these and other scientific societies. Homer served as president of NEWSS in 1969–70 and as president of the SWSS in 1986–87. He served on several WSSA committees, including the Executive Board of Directors. In 1978, Dr. LeBaron was elected a Fellow in the WSSA, and received the Distinguished Service Award in the SWSS in 1984.He is author of over 70 scientific publications, and has been editor and author of five books on herbicide and pesticide resistance and biotechnology. He is currently serving on the parent Herbicide Resistance Action Committee (HRAC) under GIFAP, as well as on the ALS/AHAS Inhibitors Resistance Working Group and as Chairman of the Triazine Resistance Working Group. He is on the Planning Committee and Co-Chair of the Weed Resistance Management Working Group within the International Organization for Pest Resistance Management (IOPRM). In addition to his busy professional schedule, Dr. LeBaron has always been involved in church and community affairs. He has 7 children and 20 grandchildren.

scholarly journals A Very Short History of the Carbohydrate Division of the American Chemical Society

2020 ◽  
Vol 85 (24) ◽  
pp. 15778-15779
Author(s):  
Todd L. Lowary ◽  
Nicola L. Pohl
Keyword(s):  
American Chemical Society ◽  
Chemical Society ◽  
Short History ◽  
History Of

scholarly journals Applicability of Thermoplastic Elastomers to Impact Load Reduction in Sports Equipment

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 163
Author(s):  
Akihiro Matsuda ◽  
Shigeru Kawahara
Keyword(s):  
Impact Load ◽  
Damage Model ◽  
Thermoplastic Elastomer ◽  
Tensile Loading ◽  
Thermoplastic Elastomers ◽  
Load Reduction ◽  
Loading Test ◽  
Element Analysis ◽  
Hyperelastic Model ◽  
The Impact

In this paper, mechanical properties of thermoplastic elastomers were investigated to expand the applicability of thermoplastic elastomers to the impact load reduction for the sports equipment. The thermoplastic elastomers show both thermoplastic and elastomeric properties. These are expected to apply to the impact load reduction in sports equipment due to good processability and less-smell. In this study, thermoplastic elastomers were applied for monotonic and cyclic tensile loading tests. The thermoplastic elastomer (TPE) materials in this study were newly developed for the specific purpose of impact load reduction. The nonlinear hyperelastic model considering the viscosity and damage model was applied to the tensile loading test results. finite element analysis (FEA) results of TPE specimens with periodic geometric shapes to reduce impact load were investigated.

Elastomeric Block Polymers

1980 ◽  
Vol 53 (3) ◽  
pp. 728-771 ◽  
Author(s):  
P. Dreypuss ◽  
L. J. Fetters ◽  
D. R. Hansen
Keyword(s):  
New Technology ◽  
Thermoplastic Elastomer ◽  
Thermoplastic Elastomers ◽  
Block Polymers ◽  
Difficult Challenge ◽  
New Applications

Abstract Development of new thermoplastic elastomers is a challenge for future years. It is a difficult challenge because existing thermoplastic elastomers offer a wide variety of prices and properties with good performance price ratios. Most advancements will probably be accomplished by blending or compounding or by slight molecular modifications of existing products. However, a new thermoplastic elastomer can not be ruled out if new technology is developed. With new applications yet to be discovered, and as existing markets mature, the growth of new and existing thermoplastic elastomers should be exciting in the years ahead.

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