Study on Non-isothermal Crystallization of Poly(L-lactide) under Steady Shear

Wen-xian HUANG; Song-chao TANG; Yun-fei GUO; Zhu-lin LIU

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Study on Non-isothermal Crystallization of Poly(L-lactide) under Steady Shear

更新时间：2022-09-18

- Study on Non-isothermal Crystallization of Poly(L-lactide) under Steady Shear
- Polymer Bulletin Vol. 27, Issue 7, Pages: 61-66(2014)
- 作者机构：
  
  华东理工大学材料科学与工程学院，上海市先进聚合物材料重点实验室，　超细材料制备与应用教育部重点实验室，上海　200237
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2014-07，
  
  Received：26 November 2013，
  
  Revised：27 March 2014，
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Wen-xian HUANG, Song-chao TANG, Yun-fei GUO, Zhu-lin LIU. Study on Non-isothermal Crystallization of Poly(L-lactide) under Steady Shear. [J]. Polymer Bulletin 27(7):61-66(2014)
DOI：

Wen-xian HUANG, Song-chao TANG, Yun-fei GUO, Zhu-lin LIU. Study on Non-isothermal Crystallization of Poly(L-lactide) under Steady Shear. [J]. Polymer Bulletin 27(7):61-66(2014) DOI：

摘要

利用光学流变显微镜(ORM)在线研究剪切场下左旋聚乳酸(PLLA)非等温结晶过程，采用差示扫描量热法(DSC)和广角X射线衍射(WAXD)研究了剪切后样品的热行为和结晶性能。实验结果表明，施加剪切作用不改变PLLA的晶型，但大大加快了结晶过程，提高了起始温度。PLLA在剪切场下的结晶形态主要受剪切速率的影响，当剪切速率高于临界剪切速率(10s~(-1)时，PLLA由球晶向串晶转变。随着剪切速率增大，串晶的数量变多变窄，结晶更完善，结晶度增大。与剪切速率相比，剪切时间对PLLA的非等温结晶影响影响较小。

Abstract

In-site optical rheological microscope(ORM) was used to study the non-isothermal crystallization of Poly(L- lactide) (PLLA). The thermal behavior and crystalline properties of PLLA after shear treatment was analyzed by differential scanning calorimetry(DSC) and wide angle X-ray diffraction(WAXD). The result indicated that shear flow had no effect on the crystal type of PLLA but greatly accelerated the crystallization

and improved the initial crystallization temperature. The crystalline morphology of PLLA under shear was mainly influenced by the shear rate. The crystalline morphology of PLLA changed from spherulites to shish-kebabs when shear rate was higher than the critical shear rate (10s

-1

). As the shear rate increased

more shish-kebabs with smaller size were acquired

the crystal structure was more perfect and the crystallinity increased. Compared with shear rate

shear time had little effect on the crystallization behavior of PLLA.

关键词

左旋聚乳酸稳态剪切非等温结晶结晶形态

Keywords

Poly(L-lactide)Steady shearNon-isothermal crystallizationCrystalline morphology

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