Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Z17: Responsive Polymers, Soft Materials, and Crystallization
11:30 AM–2:18 PM,
Friday, March 18, 2022
Room: McCormick Place W-184BC
Sponsoring
Units:
DPOLY DSOFT
Chair: Matthew Green, Arizona State University
Abstract: Z17.00011 : Rheological investigation of partially crystallized polymer melts
1:54 PM–2:06 PM
Presenter:
Marat Andreev
(Massachusetts Institute of Technology MI)
Authors:
Marat Andreev
(Massachusetts Institute of Technology MI)
Gregory C Rutledge
(Massachusetts Institute of Technology MIT)
Anthony Kotula
(National Institute of Standards and Technology)
Jaap den Doelder
(4Dow Benelux BV, Terneuzen, The Netherlands)
Jonathan Moore
(The Dow Chemical Company, Midland, MI)
In this work, we explore the relationships between short-chain branching (SCB), crystallite/amorphous domain arrangement, and rheology of partially crystallized polymers. We apply multi-scale modeling and rheo-Raman measurements to industrial-grade linear low density polyethylenes. SCB variations, usually implicit in the melt rheology, manifest strongly in the structure of the network formed from crystallites and polymer chains participating in both amorphous and crystalline domains. We use the Monte-Carlo copolymer crystallization model to distribute monomers between crystalline and amorphous phases. Then the entanglement-level discrete slip-link model (DSM) uses free, bridging, and dangling chains in the amorphous domain to calculate the rheology of semi-crystalline material.
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