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Renewable Elastomers Based on Blends of Maleated Polypropylene and Plasticized Starch

机译：基于马来化聚丙烯和增塑淀粉共混物的可再生弹性体

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Most recent developments in polymers from renewable resources have focused on thermoplastics, whereas there has been no comparable development of plastics with elastomeric properties. Here we evaluate the possibility of developing renewable elastomers based on starch. Potato starch plasticized with glycerol. (called plasticized starch, or PLS) was melt-blended with small quantities (5 wt %, or 15 wt%) of maleated polypropylene (MAPP). The maleic anhydride groups of the polypropylene are expected to react with the hydroxy groups of starch under melt blending conditions. The resulting blends of MAPP and PLS were characterized by mechanical testing, SEM, DMA, and DSC. SEM, solubility and adhesion tests indicate that the blends are two-phase materials, in which the continuous phase PLS is physically crosslinked by polypropylene domains. The materials showed rubbery properties as judged by a low glass transition temperature (similar to-50 degrees C independent of polypropylene content), and a wide rubbery plateau in DMA experiments that extended from room temperature to as high as 170 degrees C. The tensile properties are also characteristic of elastomers. However, slow aging due to starch crystallization, and extraction of glycerol upon water exposure remain two challenges that must be overcome before the materials can be used as practical elastomers.
机译：来自可再生资源的聚合物的最新进展集中在热塑性塑料上，而具有弹性的塑料却没有可比的发展。在这里，我们评估了开发基于淀粉的可再生弹性体的可能性。马铃薯淀粉用甘油增塑。将其（称为增塑淀粉或PLS）与少量（5 wt％或15 wt％）的马来化聚丙烯（MAPP）熔融共混。期望聚丙烯的马来酸酐基团在熔融共混条件下与淀粉的羟基反应。通过机械测试，SEM，DMA和DSC表征了MAPP和PLS的共混物。 SEM，溶解度和粘附力测试表明，共混物是两相材料，其中连续相PLS通过聚丙烯域物理交联。通过低玻璃化转变温度（与聚丙烯含量无关，类似于50摄氏度）和在DMA实验中从室温扩展至高达170摄氏度的宽橡胶平稳期来判断，该材料显示出橡胶性质。拉伸性能也是弹性体的特征。然而，由于淀粉结晶而导致的缓慢老化，以及暴露于水后甘油的提取仍然是在将该材料用作实用的弹性体之前必须克服的两个挑战。

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