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Morphological Studies of Solution-Crystallized Thermoplastic Elastomers with Polyethylene Endblocks and a Random-Copolymer Midblock

Journal Article · · Macromolecular Rapid Communications
 [1];  [2];  [3];  [4]
  1. North Carolina State Univ., Raleigh, NC (United States); Kraton Corporation, Houston, TX (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Procter & Gamble Co., Cincinnati, OH (United States)
  4. North Carolina State Univ., Raleigh, NC (United States)

Styrenic thermoplastic elastomers (TPEs) in the form of triblock copolymers possessing glassy endblocks and a rubbery midblock account for the largest global market of TPEs worldwide, and typically rely on microphase separation of the endblocks and the subsequent formation of rigid microdomains to ensure satisfactory network stabilization. In this work, the morphological characteristics of a relatively new family of crystallizable TPEs that instead consist of polyethylene endblocks and a random-copolymer midblock composed of styrene and (ethylene-co-butylene) moieties are investigated. Copolymer solutions prepared at logarithmic concentrations in a slightly endblock-selective solvent are subjected to crystallization under different time and temperature conditions to ascertain if copolymer self-assembly is directed by endblock crystallization or vice versa. According to transmission electron microscopy, semicrystalline aggregates develop at the lowest solution concentration examined (0.01 wt%), and the size and population of crystals, which dominate the copolymer morphologies, are observed to increase with increasing aging time. Real-space results are correlated with small- and wide-angle X-ray scattering to elucidate the concurrent roles of endblock crystallization and self-assembly of these unique TPEs in solution.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1845898
Alternate ID(s):
OSTI ID: 1821495
Journal Information:
Macromolecular Rapid Communications, Journal Name: Macromolecular Rapid Communications Journal Issue: 21 Vol. 42; ISSN 1022-1336
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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