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Long‐chain branched random polyethylene via acyclic diene metathesis (ADMET) copolymerization Part A Polymer chemistry

Author:
Li, Hong, Rojas, Giovanni, Wagener, Kenneth B.
Source:
Journal of polymer science 2018 v.56 no.15 pp. 1705-1710
ISSN:
0887-624X
Subject:
branches, composite polymers, copolymerization, endothermy, feedstocks, melting, models, polyethylene
Abstract:
Five types of ethylene/α‐alkene model copolymers containing 21‐carbon alkyl branches have been synthesized via acyclic diene metathesis (ADMET) copolymerization. The overall branch content is controlled by varying the feedstock ratio of the long‐chain branched symmetrical α, ω‐diene and 1,9‐decadiene. Well‐defined melting transitions are present at low branch incorporation, followed by the broadening of the endotherms as the branch contents increase. However, instead of making the material amorphous, further increasing of the branch contents leads to the retrieval of the semi‐crystalline material creating a new crystalline domain, branches that co‐crystallize. Detailed IR spectra analyses suggest a crystal morphology transformation from orthorhombic to hexagonal phase as the branch content increases in these polymers. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018
Agid:
5983102