低含量聚乳酸对微孔发泡聚丁二酸丁二醇酯泡孔结构的改善

陈祥辉; 黄汉雄

doi:10.11777/j.issn1000-3304.2017.17003

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低含量聚乳酸对微孔发泡聚丁二酸丁二醇酯泡孔结构的改善

研究论文 | 更新时间：2021-01-26

- 低含量聚乳酸对微孔发泡聚丁二酸丁二醇酯泡孔结构的改善
- Improving Cellular Structure of Microcellular Poly (butylene succinate)via Adding Low Content of Poly (lactic acid)
- 高分子学报 2017年第8期页码：1331-1338
- 作者机构：
  
  华南理工大学塑料橡胶装备及智能化研究中心广州 510640
- 作者简介：
  
  黄汉雄, E-mail:mmhuang@scut.edu.cn Han-xiong Huang, E-mail:mmhuang@scut.edu.cn
- 基金信息：
  
  广东省自然科学基金重大基础培育项目(2016A030308018)
- DOI：10.11777/j.issn1000-3304.2017.17003
  中图分类号：
- 纸质出版日期：2017-8，
  
  收稿日期：2017-1-5，
  
  修回日期：2017-2-14，
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陈祥辉, 黄汉雄. 低含量聚乳酸对微孔发泡聚丁二酸丁二醇酯泡孔结构的改善[J]. 高分子学报, 2017,(8):1331-1338.

Chen Xiang-hui, Huang Han-xiong. Improving Cellular Structure of Microcellular Poly (butylene succinate)via Adding Low Content of Poly (lactic acid)[J]. Acta Polymerica Sinica, 2017,(8):1331-1338.
陈祥辉, 黄汉雄. 低含量聚乳酸对微孔发泡聚丁二酸丁二醇酯泡孔结构的改善[J]. 高分子学报, 2017,(8):1331-1338. DOI： 10.11777/j.issn1000-3304.2017.17003.

Chen Xiang-hui, Huang Han-xiong. Improving Cellular Structure of Microcellular Poly (butylene succinate)via Adding Low Content of Poly (lactic acid)[J]. Acta Polymerica Sinica, 2017,(8):1331-1338. DOI： 10.11777/j.issn1000-3304.2017.17003.

摘要

通过挤出制备了可生物降解聚丁二酸丁二醇酯（PBS）和3种聚乳酸（PLA）含量（7 wt%、15 wt%和20 wt%）的PBS/PLA共混物样品，采用超临界二氧化碳作为物理发泡剂对样品进行间歇发泡，研究发泡样品的泡孔结构，并分析其形成机理.在120℃发泡温度（

）下，借助PLA对PBS熔体黏弹性尤其是熔体强度的改善，获得了分布较均匀、形状较规则、直径较小（平均值约10 μm）的微孔；共混物发泡样品的直径分布明显变窄，且符合高斯分布，这归因于细小的PLA相较均匀地分布于PBS基体中.进一步地，研究

对PBS和PLA含量为15 wt%的PBS/PLA共混物发泡样品泡孔结构的影响.结果表明，加入15 wt%的PLA使PBS的

下限从115℃降低至110℃，并显著改善了较高

（120和125℃）下制备的发泡样品内泡孔结构的均匀性.

Abstract

A new strategy was proposed to improve foaming properties of poly(butylene succinate) (PBS)

via

blending it with low content of poly(lactic acid) (PLA). Biodegradable PBS/PLA blend samples with PLA content of 7 wt%

15 wt% and 20 wt% and pure PBS sample were prepared using a single-screw extruder with a chaotic mixing screw developed in our group. The samples were then foamed using supercritical carbon dioxide as physical foaming agent in a batch process. The cellular structure of the foamed samples was investigated

and its formation mechanism was analyzed. At foaming temperature (

) of 120℃

the foamed PBS sample exhibited an irregular cellular structure and wider cell diameter distribution (5-30 μm). Adding low PLA content (7 wt%

15 wt% or 20 wt%) obviously improved the foaming properties of the PBS. Microcells were developed with more uniform distribution

more regular shape

and smaller diameter (with a mean value of about 10 μm) for all the foamed blend samples. This is attributed to improved storage modulus

complex viscosity and especially melt strength of the PBS induced by added PLA. Moreover

the cell diameters for the foamed blend samples exhibited a much narrower distribution (4-18 μm) and followed Gaussian distribution

resulting from good dispersion of the PLA microdomains. Further

the effect of the

on the cellular structure of microcellular samples of the PBS and the blend with 15 wt% of PLA was investigated. As for the PBS

the lower

limit for foaming was dictated by its higher crystallinity degree

whereas the upper one by its low melt strength. Specifically

the lower

limit was 115℃. When lowering the

to 110℃

only a few sparse cells appeared in the foamed PBS sample

which was inferred to be developed at the core of spherulite. Raising the

to 120 or 125℃

the wall of some cells was ruptured. Adding 15 wt% of PLA shifted the lower

limit of the PBS from 115℃ to 110℃

and obviously improved the cellular structure uniformity and decreased the cell diameters for the foamed samples prepared at relatively high

s (120 and 125℃).

关键词

PBS/PLA共混物熔体共混超临界二氧化碳发泡泡孔结构流变性能熔体强度

Keywords

PBS/PLA blendMelt blendingSupercritical carbon dioxide foamingCellular structureRheological propertiesMelt strength

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