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以马来酸酐接枝聚丙烯(PP-g-MAH)为相容剂,回收聚对苯二甲酸乙二醇酯(rPET)为基体材料,动态硫化热塑性弹性体(TPV)为增韧材料,制备了rPET/TPV/PP-g-MAH共混物。用SEM、DMA及DSC分析了TPV及PP-g-MAH对rPET断面结构、储能模量和结晶性能的影响,并测试了共混物的力学性能。结果表明:加入9.95%TPV后,rPET/TPV共混物的熔融温度下降了2.33℃,结晶温度提高了2.82℃,断裂伸长率及缺口冲击强度明显提高,弯曲强度和拉伸强度略有下降;加入PP-g-MAH后,TPV球状粒子嵌入rPET基体材料中,共混物的相容性提高,储能模量明显增大,刚性增强,弯曲强度和拉伸强度有所提高;与纯rPET相比,含1.8%PP-g-MAH的rPET/TPV/PP-g-MAH共混物的断裂伸长率提高了129.06%,缺口冲击强度提高了47.02%。
Polyethylene terephthalate (rPET) was recycled as matrix material and dynamically vulcanized thermoplastic elastomer (TPV) as toughening material by using maleic anhydride grafted polypropylene (PP-g-MAH) as compatibilizer. The rPET / TPV / PP-g-MAH blends were prepared. The effects of TPV and PP-g-MAH on the structure, storage modulus and crystallinity of rPET were analyzed by SEM, DMA and DSC. The mechanical properties of the blends were also tested. The results showed that the melting temperature of rPET / TPV blend decreased by 2.33 ℃ and the crystallization temperature increased by 2.82 ℃ after adding 9.95% TPV, the breaking elongation and notched impact strength increased obviously, and the flexural strength and tensile strength decreased slightly ; After adding PP-g-MAH, the spherical particles of TPV embedded in rPET matrix material, the compatibility of the blend increased, storage modulus increased significantly, rigidity increased, flexural strength and tensile strength increased; and pure Compared with rPET, the elongation at break of rPET / TPV / PP-g-MAH blend containing 1.8% PP-g-MAH increased by 129.06% and the notched impact strength increased by 47.02%.