Journal
POLYMER
Volume 54, Issue 26, Pages 7088-7093Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2013.10.055
Keywords
SAXS; Crystallization; End-linked network
Categories
Funding
- National Natural Science Foundation of China [51033004, 51120135002]
- Fund for One Hundred Talent Scientist of CAS
- Fundamental Research Funds for the Central Universities
- 973 program of MOST [2010CB934504]
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In this work extension induced crystallization of end-linked polyethylene oxide (PEO) network was investigated with in-situ small angle X-ray scattering (SAXS) and rheological measurement. The coupling between crystallinity and stress of crosslinked network makes the morphology time dependent. With a large strain the structure evolution in the stretched network is found to follow a two-stage process: i) crystals with high numerical density and small dimension form first, which laterally correlate with adjacent ones; ii) continuous melting and fusing of adjacent crystal happen after the first nucleation stage, leading to increase of crystal dimension and stability. Decreasing strain a gradual transformation to normal lamellae formation is found. Strain tuned confinement and crystallization induced confinement release is supposed to induce the structural change. (C) 2013 Elsevier Ltd. All rights reserved.
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