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A novel method to produce sustainable biocomposites based on thermoplastic corn-starch reinforced by polyvinyl alcohol fibers

机译：一种新的制备基于聚乙烯醇纤维的热塑性玉米淀粉的可持续生物复合材料的新方法

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摘要

Adding reinforced fiber or cross-linking agent into thermoplastic starch (TPS) is an effective method to improve its performance. Herein, biodegradable polyvinyl alcohol fiber (PVAF) and sodium hexametaphosphate (SHMP) were not added into TPS directly; the PVAFs were preliminary treated (pre-soaking) by an SHMP solution, and then mixed with starch and glycerol to prepare 2 wt% PVAF/TPS composites through extrusion and injection molding. This process promoted crosslinking action between PVAFs and starch, and as a consequence enhanced the mechanic and dynamic mechanic behavior. The PVAFs with different immersion times were characterized by SEM, FTIR, and WAXD. The results confirmed that the SHMP coating was formed by a chemical bond connection on the surface of the PVAFs, particularly for the PVAFs soaked for 1.5 h, which produced a corresponding PVAF/TPS composite with a maximum tensile strength of 9.18 MPa and an impact strength of 21.29 kJ m(-2). The corresponding tensile fractured cross-section images were shown by SEM. The DMA curves indicated that the pre-soaked PVAFs effectively improved the energy storage modulus and transition temperature of composites, and the activation energy of the starch macromolecules reached a maximum of 349.9 kJ mol(-1)during the dynamic mechanic process. The contact angle attained a maximum of 66.25 degrees. Compared with TPS, the pre-soaked PVAF-reinforced PVAF/TPS composites had better mechanical properties, good processability through traditional extrusion and injection molding, reduced water wettability, and potential applications for packaging and catering.
机译：将增强纤维或交联剂加入热塑性淀粉（TPS）是改善其性能的有效方法。这里，未将可生物降解的聚乙烯醇纤维（PVAF）和六偏磷酸钠（SHMP）直接添加到TPS中;通过SHMP溶液进行初步处理（预浸泡）PVAF，然后用淀粉和甘油混合，通过挤出和注塑制备2wt％PVAF / TPS复合材料。该方法促进了PVAF和淀粉之间的交联作用，结果增强了机械和动态技工行为。具有不同浸入时间的PVAF是SEM，FTIR和WAXD的特征。结果证实，SHMP涂层通过PVAF表面上的化学键连接形成，特别是对于浸泡的PVAF为1.5小时，其产生相应的PVAF / TPS复合材料，其最大拉伸强度为9.18MPa和冲击强度21.29 kJ m（-2）。相应的拉伸裂缝横截面图像通过SEM显示。 DMA曲线表明，预浸泡的PVAFS有效地改善了复合材料的能量储存模量和转变温度，并且在动态机械过程中，淀粉大分子的激活能量最多达到了349.9kJ摩尔（-1）。接触角最多达到66.25度。与TP相比，预浸泡的PVAF加强PVAF / TPS复合材料具有更好的机械性能，通过传统的挤出和注塑，降低水润湿性和用于包装和餐饮的潜在应用，良好的加工性。

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  • 来源
    《RSC Advances》 |2020年第40期|共12页
  • 作者

    Yin Peng; Dong Xin; Zhou Wen; Zha Dongdong; Xu Jie; Guo Bin; Li Panxin;

  • 作者单位

    Nanjing Forestry Univ Coll Sci Nanjing 210037 Peoples R China;

    Nanjing Forestry Univ Coll Sci Nanjing 210037 Peoples R China;

    Nanjing Forestry Univ Coll Sci Nanjing 210037 Peoples R China;

    Nanjing Forestry Univ Coll Sci Nanjing 210037 Peoples R China;

    Wuhan Text Univ State Key Lab Hubei New Text Mat &

    Adv Proc Techn Coll Mat Sci &

    Engn Wuhan 430200 Peoples R China;

    Nanjing Forestry Univ Coll Sci Nanjing 210037 Peoples R China;

    Agr &

    Forest Prod Proc Academician Workstn Henan Luohe 462600 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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