Employing Sliding Graft Copolymer to Toughen Polylactide

Xue LI; Li-qun ZHANG; Hai-lan KANG

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Employing Sliding Graft Copolymer to Toughen Polylactide

更新时间：2022-09-18

- Employing Sliding Graft Copolymer to Toughen Polylactide
- Polymer Bulletin Vol. 27, Issue 9, Pages: 65-71(2014)
- 作者机构：
  
  北京化工大学材料科学与工程学院先进弹性体研究中心，北京市新型聚合物材料加工与　制备实验室，北京　100029
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2014-09，
  
  Received：21 April 2014，
  
  Revised：01 May 2014，
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Xue LI, Li-qun ZHANG, Hai-lan KANG. Employing Sliding Graft Copolymer to Toughen Polylactide. [J]. Polymer Bulletin 27(9):65-71(2014)
DOI：

Xue LI, Li-qun ZHANG, Hai-lan KANG. Employing Sliding Graft Copolymer to Toughen Polylactide. [J]. Polymer Bulletin 27(9):65-71(2014) DOI：

摘要

通过熔融共混的方法，在聚乳酸(PLA)中加入不同质量分数的滑动接枝聚合物(SGC)，对其进行增韧改性。使用扫描电子显微镜(SEM)用来表征PLA和SGC共混物的相结构，冲击断裂样条断面SEM考察聚合物的增韧机理，差示扫描量热分析(DSC)和广角X-射线衍射(XRD)用来考察PLA以及PLA/SGC共混物的热性能和结晶性能。结果表明：PLA和SGC粒子呈现典型的“海-岛”结构，SGC粒子尺寸为0. 8μm〜4.1μm含20%(wt) SGC的PLA/SGC共混物的断裂伸长率和缺口冲击强度较纯PLA分别提高了 6倍和2倍，说明SGC能够有效地对PLA进行增韧改性。体外细胞毒性测试表明，PLA/SGC共混物的细胞毒性等级为1级，为无毒材料，因此可应用在生物医学领域。

Abstract

The "sliding graft copolymer" (SGC) was employed to toughen brittle polylactide (PLA) by melt blending. The SEM was characterized the phase structure of PLA/SGC blend. The toughening mechanism was investigated by the SEM photo of impact-fractured surface of PLA/SGC blend. The thermal properties and crystallization behavior of PLA/ SGC blend were investigated by DSC and XRD. It is found that the blends showed a typical "sea-island" morphology. The particle size is from 0. 8μm to 4. lμm. The elongation at break and notch impact strength has been increased 6 and 2 times respectively as compared to unmodified PLA

which indicating the toughening effect of SGC. The in vitro cytotoxicity tests showed that the cytotoxicity of PLA/SGC blends belonged to grade 1

indicating good cytocompatibility

thus can be applied in the biomedical field.

关键词

聚乳酸增韧滑动接枝聚合物熔融共混

Keywords

PolylactideToughenSliding graft copolymerMelt blending

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