食品科学 ›› 2018, Vol. 39 ›› Issue (7): 221-229.doi: 10.7506/spkx1002-6630-201807033

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改性方式及马来酸酐添加量对淀粉/聚羟基脂肪酸酯复合膜性能的影响

孙圣麟1,刘鹏飞2,秦 洋1,王文涛1,侯汉学1,*,董海洲1   

  1. 1.山东农业大学食品科学与工程学院,山东 泰安 271018;2.齐鲁工业大学食品科学与工程学院,山东 济南 250353
  • 出版日期:2018-04-15 发布日期:2018-04-17
  • 基金资助:
    国家自然科学基金面上项目(31371747);“十二五”国家科技支撑计划项目(2013BAD18B10-3);山东省自然科学基金项目(ZR2012CM016)

Effects of Modification Methods and Maleic Anhydride Content on the Properties of Starch/Polyhydroxyalkanoate Composite Films

SUN Shenglin1, LIU Pengfei2, QIN Yang1, WANG Wentao1, HOU Hanxue1,*, DONG Haizhou1   

  1. 1. College of Food Science and Engineering, Shandong Agricultural University, Taian 271018, China; 2. College of Food Science and Engineering, Qilu University of Technology, Jinan 250353, China
  • Online:2018-04-15 Published:2018-04-17

摘要: 以羟丙基交联木薯淀粉、聚羟基脂肪酸酯(polyhydroxyalkanoate,PHA)为成膜基材,马来酸酐(maleic anhydride,MAH)为增容剂,采用挤压吹塑法制备淀粉/PHA复合膜。马来酸酐通过两种不同方式加入淀粉/PHA 体系中,即淀粉、PHA与MAH直接共混挤出(直接添加处理)和PHA先与MAH干法改性,再与淀粉共混挤出(干 法改性处理),且MAH的添加量分别为1%、3%和5%。研究改性方式及MAH添加量对膜性能的影响。结果表明: PHA质量分数为12%时,由直接添加处理1% MAH所成膜具有较高的抗拉强度和透光率,较好的阻水性、热稳定性 和相容性,且具有较为平滑均匀的微观结构;由干法改性处理5% MAH所成膜的断裂伸长率较高,膜表面较为平整 光滑。PHA质量分数为24%时,由直接添加处理3% MAH所成膜具有较高的抗拉强度,较好的阻水性、热稳定性, 且微观结构较为平滑均匀;由干法改性处理3% MAH所成膜具有较好的机械性能;由干法改性处理5% MAH所成 膜具有较高的透光率。傅里叶变换红外光谱表明MAH的添加能够增强各分子间的相互作用。综合膜的各项性能得 出,当PHA质量分数为12%时,由直接添加处理1% MAH所成膜具有较优的性能;当PHA为24%时,由直接添加处 理3% MAH所成膜的性能较优。

关键词: 马来酸酐, 改性方式, 挤压吹塑, 淀粉/聚羟基脂肪酸酯复合膜, 性能

Abstract: Hydroxypropyl distarch phosphate/polyhydroxyalkanoate (PHA) composite films were prepared by extrusion blowing using maleic anhydride (MAH) as a compatibilizer. MAH was added at 1%, 3% or 5% into the starch/PHA system by two different methods, viz., blending starch and PHA with MAH directly by extrusion (method 1) or blending PHA modified with MAH under dry conditions with starch by extrusion (method 2). The aim was to explore the effects of modification methods and MAH content on the properties of composite films were explored. The results showed that when PHA content was 12%, the films prepared by direct addition of 1% MAH exhibited higher tensile strength and light transmittance, as well as better moisture barrier property, heat stability and compatibility with a flat, smooth and uniform microstructure, while those prepared by method 2 with 5% MAH had higher elongation at break and a flat and smooth surface. The films prepared with 24% PHA and 3% MAH by the first method exhibited higher tensile strength, moisture barrier property and heat stability with a smooth and uniform microstructure. The films prepared by the second method with 24% PHA and 3% MAH had better mechanical properties, while films with higher light transmittance were obtained with 5% MAH when other conditions were kept the same. Fourier transform infrared spectroscopy suggested that addition of MAH could enhance the intermolecular interaction. These results suggested that the films prepared by direct addition of 1% MAH exhibited better properties when PHA content was 12%, whereas those prepared by direct addition 3% MAH showed better properties when PHA content was 24%.

Key words: maleic anhydride, modification method, extrusion blowing, starch/polyhydroxyalkanoate composite films, properties

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