胺端基型超支化乙二胺三嗪聚合物对PLA/PPC的增韧改性研究

以乙二胺和三聚氯氰作为原料，以丙酮为溶剂，通过“一步法”合成了胺端基型的超支化乙二胺三嗪聚合物(HBETP)。以HBETP作为改性剂，采用双螺杆挤出机熔融共混和注射成型法制备了聚乳酸(PLA)/聚碳酸亚丙酯(PPC)共混物，并用差示扫描量热仪(DSC)、 热失重分析仪(TGA)、电子万能试验机、扫描电字显微镜(SEM)等测试手段对共混物的热性能、力学性能以及断面形貌等进行表征与测试。结果表明，与PLA/PPC共混物相比，当HBETP含量为0.6份时，PLA/PPC/HBETP共混体系在保持拉伸强度基本不变的基础上，断裂伸长率和冲击强度分别提高了266.0 %和122.9 %；HBETP是一种增韧PLA/PPC共混物的有效助剂。

Study on Toughening Modification of PLA/PPC Blends with Hyperbranched Ethylenediamine Trazine Polymer

Hyperbranched ethylenediamine triazine polymer (HBETP) was synthesized by a one?step method using ethylenediamine and cyanuric chloride as raw materials and acetone as a solvent, and then polylactic acid (PLA)/polypropylene carbonate (PPC) blends were prepared by melt blending with HBETP as an impact modifier. The thermal properties, mechanical properties and the cross?sectional morphology of PLA/PPC/HBETP blends were investigated by means of differential scanning calorimetry thermogravimetric analysis, electronic universal testing machine and scanning electron microscopy. The results indicated that the elongation at break and impact strength of the blends increased by 266.0 % and 122.9 %, respectively, when 0.6 phr of HBETP was incorporated. HBETP can act as an effective impact modifier for toughening of PLA/PPC blends.