Toughening of Poly(lactic acid) by Epoxy Functionalized Core-Shell Starch-based Nanoparticles

Zheng-gui Wu; Xin-yi Dong; Wei-fu Dong

doi:10.11777/j.issn1000-3304.2020.20274

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Toughening of Poly(lactic acid) by Epoxy Functionalized Core-Shell Starch-based Nanoparticles

Research Article | 更新时间：2024-02-20

- Toughening of Poly(lactic acid) by Epoxy Functionalized Core-Shell Starch-based Nanoparticles
- ACTA POLYMERICA SINICA Vol. 52, Issue 7, Pages: 734-740(2021)
- 作者机构：
  
  江南大学化学与材料工程学院无锡 214122
- 作者简介：
  
  Wei-fu Dong, E-mail: wfdong@jiangnan.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2020.20274
  CLC：
- Published：20 July 2021，
  
  Published Online：26 May 2021，
  
  Received：12 December 2020，
  
  Revised：07 January 2021，
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吴正贵,董新一,东为富.环氧化淀粉基核壳纳米粒子增韧聚乳酸的研究[J].高分子学报,2021,52(07):734-740.

Zheng-gui Wu, Xin-yi Dong, Wei-fu Dong. Toughening of Poly(lactic acid) by Epoxy Functionalized Core-Shell Starch-based Nanoparticles. [J]. ACTA POLYMERICA SINICA 52(7):734-740(2021)
吴正贵,董新一,东为富.环氧化淀粉基核壳纳米粒子增韧聚乳酸的研究[J].高分子学报,2021,52(07):734-740. DOI： 10.11777/j.issn1000-3304.2020.20274.

Zheng-gui Wu, Xin-yi Dong, Wei-fu Dong. Toughening of Poly(lactic acid) by Epoxy Functionalized Core-Shell Starch-based Nanoparticles. [J]. ACTA POLYMERICA SINICA 52(7):734-740(2021) DOI： 10.11777/j.issn1000-3304.2020.20274.

摘要

通过酰氯接枝反应在淀粉大分子链上引入长烷基链和碳碳双键，使淀粉具有自乳化性能并增加反应位点，采用无皂乳液聚合将丙烯酸乙酯(EA)与酯化改性淀粉接枝共聚制备以淀粉为核的核壳粒子，即核壳粒子为硬核软壳的结构，通过添加甲基丙烯酸缩水甘油醚(GMA)进一步制备环氧化核壳粒子. 将环氧化核壳粒子与聚乳酸(PLA)进行熔融共混改性，研究不同环氧化程度的核壳粒子对PLA性能的影响. 结果表明，环氧化淀粉核壳粒子粒径约250 nm，与PLA共混改性后，环氧化核壳粒子能够明显提高PLA的韧性，而且其拉伸强度维持在较高水平，共混物缺口冲击强度提高至纯PLA的17倍. 进一步研究表明环氧官能团的引入提高了核壳粒子与PLA的相容性同时增加了界面相互作用.

Abstract

The long alkyl chain and carbon-carbon double bonds were introduced on the surface of starch through the reaction of starch and acid chloride

which endowed the starch with excellent emulsification properties and reaction sites. Then the core-shell starch-based nanoparticles

where the starch worked as the rigid core while poly(ethyl acrylate) (PEA) served as the soft shell

were prepared by soap-free emulsion copolymerization of ethyl acrylate (EA) to form PEA shell covering the starch. After that

glycidyl methacrylate (GMA) was added into the core-shell nanoparticles emulsion to prepare epoxy functionalized core-shell nanoparticles. Finally

the obtained epoxy functionalized core-shell nanoparticles were melt-blended with poly(lactic acid) (PLA) and PLA-based nanocomposites were prepared. Effects of epoxy functionalized core-shell nanoparticles on the mechanical properties of PLA were studied. FTIR spectra and TEM test revealed that the epoxy functionalized core-shell nanoparticles with an average particle size of around 250 nm were successfully prepared. Mechanical property test showed that the prepared epoxy functionalized core-shell nanoparticles dramatically improved the toughness of PLA and maintained its high tensile strength. Specifically

the notched impact strength of the blends was as high as 17 times that of neat PLA. In addition

the SEM and DMA tests indicated that the introduction of epoxy functional groups of core-shell nanoparticles significantly improved the compatibility of core-shell nanoparticles with PLA matrix.

关键词

酯化淀粉核壳粒子环氧化聚乳酸增韧

Keywords

Esterified starchCore-shell particlesEpoxy functionalizedPoly(lactic acid)Toughening

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Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University

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