Open AccessA study of ADMET polyethylene with 21‐carbon branches on every 15th compared to every 19th carbon: What a difference four extra backbone methylenes make
Author(s) -
Matsui Kazuya,
Li Hong,
Nozue Yoshinobu,
Rojas Giovanni,
Bell Michael,
Shinohara Yuya,
Amemiya Yoshiyuki,
Wagener Kenneth B.
Publication year - 2017
Publication title -
journal of polymer science part a: polymer chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.768
H-Index - 152
eISSN - 1099-0518
pISSN - 0887-624X
DOI - 10.1002/pola.28649
Subject(s) - crystallization , carbon fibers , chain (unit) , polyethylene , carbon chain , alkyl , polymer chemistry , polymer , side chain , materials science , chemistry , polymer science , chemical engineering , crystallography , composite material , organic chemistry , physics , astronomy , engineering , composite number
Precision polyethylenes with 21‐carbon alkyl branches precisely spaced on every either 15th or 19th carbon along the polymer backbone lead to the formation of two kinds of lamellae, yielding different thicknesses during the crystallization process. Thinner lamellae originate from side‐chain crystallization, whereas thicker lamellae are formed by cocrystallization of the branch and the main chain. Side‐chain crystallization (separate from main chain crystallization) is favored when the branch is placed on every 15th carbon. Cocrystallization (side chain with main chain) is favored with the branch on every 19th carbon. Both form stable hexagonal crystal units. A branch spacing separation of just four carbons along the main chain makes a remarkable difference in crystallization behavior. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55 , 3090–3096