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首页> 外文期刊>Journal of Applied Polymer Science >Properties of Extruded Starch-Poly(methyl acrylate) Graft Copolymers Prepared from Spherulites Formed from Amylose-Oleic Acid Inclusion Complexes
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Properties of Extruded Starch-Poly(methyl acrylate) Graft Copolymers Prepared from Spherulites Formed from Amylose-Oleic Acid Inclusion Complexes

机译：由直链淀粉-油酸包合物形成的球晶制备的挤出淀粉-聚丙烯酸酯（丙烯酸甲酯）接枝共聚物的性能

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Mixtures of high-amylose corn starch and oleic acid were processed by steam jet cooking, and the dispersions were rapidly cooled to yield amylose-oleic acid inclusion complexes as micron- and submicron-sized spherulites and spherulite aggregates. Dispersions of these spherulite particles were then graft polymerized with methyl acrylate, both before and after removal of uncomplexed amylopectin by water washing. For comparison, granular, uncooked high-amylose corn starch was also graft polymerized in a similar manner. Graft copolymers with similar percentages of grafted and ungrafted poly(methyl acrylate) (PMA) were obtained from these polymerizations. The graft copolymers were then processed by extrusion through a ribbon die, and the tensile properties of the extruded ribbons were determined. Although extruded ribbons with similar tensile strengths were obtained from the three starch- PMA graft copolymers, much higher values for % elongation were obtained from the spherulite-containing systems. Also, the tensile properties were not significantly affected by removal of soluble, uncomplexed amylopectin by water washing before graft polymerization. These results are consistent with the observation that these PMA-grafted starch particles did not melt during extrusion, and that continuous plastic ribbons were formed by fusing these particles together in the presence of small amounts of thermoplastic PMA matrix.
机译：通过蒸汽喷射蒸煮处理高直链玉米淀粉和油酸的混合物，并将分散体快速冷却，以得到微米和亚微米尺寸的球晶和球晶聚集体的直链淀粉-油酸包合物。然后在通过水洗除去未络合的支链淀粉之前和之后，将这些球晶颗粒的分散体与丙烯酸甲酯接枝聚合。为了进行比较，还以类似的方式将粒状的，未煮熟的高直链玉米淀粉进行了接枝聚合。从这些聚合中获得具有相似百分比的接枝和未接枝的聚（丙烯酸甲酯）（PMA）的接枝共聚物。然后通过带状模头通过挤出加工接枝共聚物，并测定挤出的带的拉伸性能。尽管从三种淀粉-PMA接枝共聚物获得了具有相似拉伸强度的挤出带材，但从含球晶的体系中却获得了更高的％延伸率值。而且，在接枝聚合之前通过水洗除去可溶性的，未络合的支链淀粉没有显着影响拉伸性能。这些结果与以下观察结果相一致：观察到这些PMA接枝的淀粉颗粒在挤出过程中不会熔化，并且在少量热塑性PMA基质存在下通过将这些颗粒融合在一起而形成连续的塑料带。

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