Study on the Crystallization Behavior of PLLA/PDLA Blends Assist by Compound Zinc Salt and Supercritical Fluids

Xun-xian ZHU; Hong-xiang GAO; Wei LIU; Xiang-dong SU; Xian WU

doi:10.14028/j.cnki.1003-3726.2020.09.005

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Study on the Crystallization Behavior of PLLA/PDLA Blends Assist by Compound Zinc Salt and Supercritical Fluids

更新时间：2022-08-31

- Study on the Crystallization Behavior of PLLA/PDLA Blends Assist by Compound Zinc Salt and Supercritical Fluids
- Polymer Bulletin Vol. 33, Issue 9, Pages: 43-51(2020)
- 作者机构：
  
  1.贵州理工学院材料与能源工程学院,贵阳 550003
  2.贵州省轻金属材料制备技术重点实验室,贵阳 550003
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2020.09.005
  CLC：
- Published：20 September 2020，
  
  Received：12 December 2019，
  
  Revised：29 July 2020，
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Xun-xian ZHU, Hong-xiang GAO, Wei LIU, Xiang-dong SU, Xian WU. Study on the Crystallization Behavior of PLLA/PDLA Blends Assist by Compound Zinc Salt and Supercritical Fluids. [J]. Polymer Bulletin 33(9):43-51(2020)
DOI：

Xun-xian ZHU, Hong-xiang GAO, Wei LIU, Xiang-dong SU, Xian WU. Study on the Crystallization Behavior of PLLA/PDLA Blends Assist by Compound Zinc Salt and Supercritical Fluids. [J]. Polymer Bulletin 33(9):43-51(2020) DOI： 10.14028/j.cnki.1003-3726.2020.09.005.

摘要

将PLLA和PDLA熔融共混

制备立构复合晶(Sc)和α晶的复杂结晶结构

并利用复合锌盐(CNA)和两种超临界流体协同诱导和调控Sc/α复杂晶形。研究发现:首先

PDLA 含量是控制Sc/α复杂晶形比例的直接方法。随着PDLA含量增加

Sc结晶度由0.4%提高至7.00%

同时α晶被抑制

结晶度由17.19%降低至1.29%。其次

CNA表现出高效的结晶促进和成核效果

能够同时提高α和Sc晶的结晶度。此外

超临界N

和CO

是一种增塑剂

其中CO

增塑效果更好

超临界流体会促进α晶的生成并抑制Sc晶的产生。超临界流体与CNA协同改性PLA结晶性能时

将有利于α结晶度大幅度提高。最终

Sc和α结晶度最高可达到8.07%和24.55%。

Abstract

The complex polycrystalline systems consisted of stereocomplex (Sc) and α crystals were prepared by meltmixing PLLA with PDLA. The mechanism of inducing and forming the complex crystalline structure was studied under compound phenylphosphonic acid zinc salt (CNA) and two supercritical fluids. The results shown that increase PDLA content was a useful way to control the Sc/α polycrystalline structure. With the PDLA content increase

the crystallinity of Sc increase from 0.4% to 7.00%

but the crystallinity of α decrease from 17.19% to 1.29%. Meanwhile

CNA is an efficient crystal promoter and nucleator agent. With the adding of CNA

the crystallinity of both Sc and α increased. The supercritical N

and CO

are plasticizers. And the plasticization effect of CO

is more obvious than that of N2. Under the two supercritical fluids

the Sc crystallization was suppressed

whereas the α crystallization was promoted. The co-existing of CAN and the two supercritical fluids could suppress the Sc crystallization. And

the α crystallinity was greatly increased. Eventually

the crystallinity of Sc and α could reach the maximum of 8.07% and 24.55%

respectively.

关键词

聚左旋乳酸聚右旋乳酸超临界流体立构复合晶苯基磷酸锌

Keywords

PLLAPDLASupercritical fluidStereocomplexPPZn

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