CRYSTAL ORIENTATION AND MELTING BEHAVIOR OF POLY(-CAPROLACTONE) UNDER ONE-DIMENSIONALLY HARD CONFINED MICROENVIRONMENT

Xuan-bo Liu Yong-feng Zhao Xing-he Fan Er-qiang Chen

Citation:  Xuan-bo Liu, Yong-feng Zhao, Xing-he Fan, Er-qiang Chen. CRYSTAL ORIENTATION AND MELTING BEHAVIOR OF POLY(-CAPROLACTONE) UNDER ONE-DIMENSIONALLY HARD CONFINED MICROENVIRONMENT[J]. Chinese Journal of Polymer Science, 2013, 31(6): 946-958. doi: 10.1007/s10118-013-1285-9 shu

CRYSTAL ORIENTATION AND MELTING BEHAVIOR OF POLY(-CAPROLACTONE) UNDER ONE-DIMENSIONALLY HARD CONFINED MICROENVIRONMENT

    通讯作者: Er-qiang Chen,
  • 基金项目:

    This work was financially supported by the National Nature Science Foundation of China (Nos. 20774006, 20990232, and 21074003).

摘要: Crystal orientation and melting behavior of poly(-caprolactone) in a diblock copolymer of poly(-caprolactone)-block-poly(2,5-bis[4-methoxyphenyl]oxycarbonyl)styrene) (PCL-b-PMPCS) was investigated. The degrees of polymerization of the PCL and PMPCS block are 200 and 98, respectively. With the PMPCS in a columnar liquid crystalline phase, the diblock is rod-coil one, which exhibits a lamellar phase morphology with the PCL layer thickness of 15.2 nm. Since the glass transition temperature of PMPCS block is much higher than the melting temperature of PCL, the crystallization of PCL is in a one-dimensionally hard confinement environment. Mainly on the basis of two-dimensional wide-angle X-ray diffraction experiments, we identified the orientation of PCL isothermally crystallized at various crystallization temperatures (Tcs). At high Tcs (Tc 10℃), the c-axis of the PCL crystal is along the layer normal of the microphase-separated sturcture. Decreasing Tc can result in the tilting of PCL c-axis with respect to the layer normal. The lower the Tc is, the more the c-axis inclines. Meanwhile, the b-axis of PCL remains perpendicular to the layer normal. At a very low Tc of -78℃, the orientation of the PCL crystals is completely random. For the samples isothermally crystallized at Tc 10℃, double melting behavior can be observed. While the low temperature endotherm reflects the melting of the crystals originally formed at the Tc applied, the high temperature one is associated with the crystals subjected to the process of recrystallization/reorganization upon heating due to the annealing effect.

English


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  • 发布日期:  2013-06-05
  • 收稿日期:  2013-01-31
  • 修回日期:  2013-02-06
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