Formation of Poly(L-lactic acid) Bundles or Microspheres by Solution Phase Separation

Rui-lai LIU; Xiao-hong DING; Jin-yun ZHAO; Jia-peng HU; Ji-lin MU; Xing-ping FU

doi:10.14028/j.cnki.1003-3726.2022.06.006

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Formation of Poly(L-lactic acid) Bundles or Microspheres by Solution Phase Separation

更新时间：2022-09-09

- Formation of Poly(L-lactic acid) Bundles or Microspheres by Solution Phase Separation
- Polymer Bulletin Vol. 35, Issue 6, Pages: 54-61(2022)
- 作者机构：
  
  1.武夷学院生态与资源工程学院,武夷山 354300
  2.福建师范大学化学与材料学院,福州 350007
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2022.06.006
  CLC：
- Published：20 June 2022，
  
  Received：28 April 2021，
  
  Revised：08 August 2021，
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Rui-lai LIU, Xiao-hong DING, Jin-yun ZHAO, Jia-peng HU, Ji-lin MU, Xing-ping FU. Formation of Poly(L-lactic acid) Bundles or Microspheres by Solution Phase Separation. [J]. Polymer Bulletin 35(6):54-61(2022)
DOI：

Rui-lai LIU, Xiao-hong DING, Jin-yun ZHAO, Jia-peng HU, Ji-lin MU, Xing-ping FU. Formation of Poly(L-lactic acid) Bundles or Microspheres by Solution Phase Separation. [J]. Polymer Bulletin 35(6):54-61(2022) DOI： 10.14028/j.cnki.1003-3726.2022.06.006.

摘要

将左旋聚乳酸(PLLA)/乙腈溶液淬火至亚稳态

使其发生液-液相分离

得到PLLA 捆束或微球。通过控制淬火时间

使PLLA从捆束向微球转变。与此同时

随着淬火时间的增加PLLA 从α'-晶型转变为更加有序规整堆积的α-晶型。淬火时间和淬火温度不变的条件下

低浓度有利于形成捆束形貌

而高浓度形成微球形貌。最后讨论了聚乳酸捆束或微球的形成机理。

Abstract

To prepare poly(L-lactic acid) (PLLA) porous microsphere

the thermally induced phase separation (TIPS) method was applied to quench PLLA/acetonitrile solutions to the metastable state

resulting in liquid-liquid phase separation of the polymer solutions. By controlling the quenching time

the porous microsphere grew from lamellar bundles to microsphere. Meanwhile

with increasing quenching time

the PLLA microsphere transformed from α'- to more stable and compact-packing α-crystal. When the quenching time and temperature were kept constant

solutions with low PLLA concentration were favorable for the formation of bundles

whereas solutions with high PLLA concentration contributed to the formation of microsphere. At last

the mechanism for the formation of PLLA bundles or microspheres was discussed.

关键词

左旋聚乳酸多孔微球相分离溶液结晶

Keywords

Poly(L-lactic acid)Porous microspheresSolution crystallizationPhase separation

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