Citation: Ya Li, Jian Zhou, Jun Li, Qu-ting Gou, Qun Gu, Zong-bao Wang. CRYSTALLIZATION AND MORPHOLOGY OF STAR-SHAPED POLYETHYLENOXYDE-b-POLYCAPROLACTONE UNDER HIGH PRESSURE CARBON DIOXIDE[J]. Chinese Journal of Polymer Science, ;2012, 30(5): 623-631. doi: 10.1007/s10118-012-1177-4 shu

CRYSTALLIZATION AND MORPHOLOGY OF STAR-SHAPED POLYETHYLENOXYDE-b-POLYCAPROLACTONE UNDER HIGH PRESSURE CARBON DIOXIDE

Received Date: 2 March 2012
Revised Date: 25 May 2012

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21004073), Natural Science Foundation of Ningbo Municipal (Nos. 2009A610050, 2008A610063, 2010A610193, 2011A610116), State Key Laboratory of Polymer Materials Engineering (Sichuan University)(KF201004), Program for Ningbo Innovative Research Team (2009B21008) and Ningbo Key Lab of Polymer Materials (No. 2010A22001).

Atomic force microscopy (AFM), wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry are used to analyze the crystallization morphology and melting behavior of 4-arm PEO-b-PCL under high-pressure CO2. It is demonstrated that CO2 has certain effect on the melting and crystallization behavior of the samples. After crystallization under CO2 at 4 MPa, spherulites with concentric ring-banded structure are formed which are composed of crystals with periodic thickness variation, and the band distance decreases with increasing treatment pressure. Due to the plasticization effect of CO2, depression of the melting temperature is observed with sorption of CO2 in polymers.
- Crystallization morphology
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