NDLI: How flow affects crystallization in a heterogeneous polyethylene oxide melt

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhou, Weiqing Meng, Lingpu Tian, Nan Li, Liangbin Hu, Tingting Liu, Dong Li, Xiangyang
Copyright Year	2014
Abstract	Extension-induced crystallization in a heterogeneous polyethylene oxide (PEO) melt is investigated by small angle X-ray scattering (SAXS) and extensional rheology. The crystalline complex of PEO and sodium bromide is the heterogeneous component, which simulates the roles of crystal or strongly interacted additives during flow. It is aimed to demonstrate how the altered chain relaxation by the heterogeneous particle affects the crystallization. The main findings are listed as follows: (i) strain hardening occurs in heterogeneous melts but not in pure PEO. This indicates that the crystalline complex strengthens the entanglement network of free chains, leading to slower chain relaxation. (ii) In morphology, the orientation of lamellae becomes easier with the existence of the crystalline complex. A jump in the long period is also observed with large strain, accompanied by changes in the evolutional trend at the early stage. (iii) The crystallization kinetics converge with increasing strain; even the stress response significantly differs in different samples. Based on these findings, a quasi-network consisting of the crystalline complex and the entangled free chain is anticipated. Nucleation induced by the stretch of the quasi-network is supposed to lead to the change in crystallization observed.
Starting Page	9632
Ending Page	9638
Page Count	7
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	4
Issue Number	19
Journal	RSC Advances
DOI	10.1039/c3ra46504g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Work hardening Nucleation Polyethylene glycol Rheology Sodium bromide Small-angle X-ray scattering
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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