Article (Scientific journals)
Stress‐Strain isotherms for stereoirregular and stereoblock cis‐trans polybutadienes
Sharaf, M. A.; Mark, J. E.; Gunesin, B. et al.
1986In Polymer Engineering and Science, 26 (2), p. 162-166
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Keywords :
ELASTOMERS - Mechanical Properties; GAMMA RAYS - Applications; POLYMERS - Crystallization; CIS-TRANS POLYBUTADIENES; STEREOBLOCK POLYMERS; STEREOIRREGULAR POLYMERS; STRESS-STRAIN ISOTHERMS; POLYBUTADIENES
Abstract :
[en] Gamma radiation and high‐energy electrons were used to crosslink two types of polybutadiene (PBD), the first having random cis‐trans‐vinyl contents and the second consisting primarily of blocks of cis units and blocks of trans. The resulting elastomers were studied in elongation in the unswollen stale, generally at 5°C, and in swelling equilibrium in a thermodynamically good solvent. Stress‐strain isotherms obtained for the random‐PBD networks did not show upturns in the reduced stress [f*] at high elongations, which is consistent with their non‐crystallizability. The stereoblock polymers were found to be crystalline, with melting points ranging from 14 to 65°C. Attempts to achieve strain‐induced crystallization in the stereoblock networks by judicious choice of temperature were unsuccessful as judged by the absence of any significant upturns in [f*]. Values of the elasticity constants 2C1 and 2C2, and the molecular weight between crosslinks were similar to those obtained from the linear portions of the isotherms previously reported for high‐cis and high‐trans PBD, which readily undergo strain‐induced crystallization. Copyright © 1986 Society of Plastics Engineers
Disciplines :
Chemistry
Author, co-author :
Sharaf, M. A.;  Department of Chemistry, Polymer Research Center, University of Cincinnati, Cincinnati, Ohio, 45221, United States
Mark, J. E.;  Department of Chemistry, Polymer Research Center, University of Cincinnati, Cincinnati, Ohio, 45221, United States
Gunesin, B.;  Central Research Laboratories, Firestone Tire and Rubber Company, Akron, Ohio, 44317, United States, Research Laboratories, Mobil Chemical Company, Edison, New Jersey, 18818, United States
Julemont, M.;  Laboratoire de Chimie Macromoleculaire Et de Catalyse Organique, University of Liege, Liege, 4000, Belgium
Teyssié, Philippe ;  Université de Liège - ULiège > Relations académiques et scientifiques (Sciences)
Language :
English
Title :
Stress‐Strain isotherms for stereoirregular and stereoblock cis‐trans polybutadienes
Publication date :
1986
Journal title :
Polymer Engineering and Science
ISSN :
0032-3888
eISSN :
1548-2634
Publisher :
John Wiley & Sons, Hoboken, United States - New Jersey
Volume :
26
Issue :
2
Pages :
162-166
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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