Journal
POLYMER
Volume 52, Issue 24, Pages 5659-5668Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2011.10.011
Keywords
Isotactic poly-1-butene; Melt-crystallization; Form I '
Categories
Funding
- National Natural Science Foundation of China [20976045, 20976046]
- Shanghai Shuguang Project [08SG28]
- Program for New Century Excellent Talents in University [NCET-09-0348]
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials (Dong Hua University)
- 111 Project [B08021]
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In this work, we found a new method to obtain isotactic poly-1-butene (iPB-1) with form I' through direct melt-crystallization using high-pressure CO2. The non-isothermal melt-crystallization behaviors of iPB-1 under atmospheric N-2 and 0.5-10 MPa CO2 at cooling rates ranging from 0.25 to 5 degrees C/min were carefully studied using high-pressure differential scanning calorimeter (DSC) and analyzed using the modified Avrami method. Wide-angle X-ray diffraction (WAXD) measurements showed that the crystal structure of non-isothermally melt-crystallized iPB-1 changed from form II under atmospheric N-2 and 0.5 8 MPa CO2 to form I' under 10 MPa CO2. In-situ high-pressure Fourier transform infrared (FTIR) was also used to investigate the non-isothermal melt-crystallization at CO2 pressure up to 18 MPa at the cooling rate of 1 degrees C/min. Likewise, it was found that form II crystallized under atmospheric N-2 and 0.5-8 MPa CO2, and form I' melt-crystallized directly at CO2 pressures higher than 10 MPa, which was confirmed by the followed DSC and WAXD characterizations on the iPB-1 films after FTIR measurements. The crystal morphology of the melt-crystallized iPB-1 films, characterized by using polarized optical microscopy (POM), showed that the Maltese cross pattern of iPB-1 spherulite became more diffuse with increasing CO2 pressure, and the spherulite size decreased abruptly at the CO2 pressure of 10 MPa. (C) 2011 Elsevier Ltd. All rights reserved.
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