Volume 28 Issue 5
Mar 2015
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YUAN Chao-Sheng, WANG Zheng, WANG Yong-Qiang, ZHU Xiang, YANG Kun, CHENG Xue-Rui, SU Lei. Influence of High Pressure on Single-Crystal Growth of Poly(L-Lactic Acid) in the Solution[J]. Chinese Journal of High Pressure Physics, 2014, 28(5): 513-518. doi: 10.11858/gywlxb.2014.05.001
Citation: YUAN Chao-Sheng, WANG Zheng, WANG Yong-Qiang, ZHU Xiang, YANG Kun, CHENG Xue-Rui, SU Lei. Influence of High Pressure on Single-Crystal Growth of Poly(L-Lactic Acid) in the Solution[J]. Chinese Journal of High Pressure Physics, 2014, 28(5): 513-518. doi: 10.11858/gywlxb.2014.05.001

Influence of High Pressure on Single-Crystal Growth of Poly(L-Lactic Acid) in the Solution

doi: 10.11858/gywlxb.2014.05.001
  • Received Date: 20 Aug 2013
  • Rev Recd Date: 10 Oct 2013
  • Lamellar single crystals of poly (L-lactic acid) (PLLA) were prepared from its dilute xylene solutions under 500 MPa by an isothermal crystallization method.Their morphology and structural features were characterized by transmission electron microscopy, raman and infrared spectra.The results show that the single crystals of PLLA grown under high pressure are only α-type crystal structure, and their average size is larger than those obtained under atmospheric conditions.Under high pressure, crystal nucleus on different sides have different growth rates, leading to the formation of asymmetric rhombic lozenge.It is found that high pressure has induced conformational distribution change of the PLLA single crystal.Furthermore, during the PLLA crystal growth period, high pressure induction is favorable for promoting the nucleus number and depressing the grown of PLLA crystal.

     

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