增塑剂对PHBV/PBS共混物性能的影响

Effect of Plasticizers on Properties of PHBV/PBS Blends

分别以柠檬酸三乙酯(TEC)、聚乙二醇(PEG)作为聚β-羟基丁酸/戊酸酯(PHBV)和聚丁二酸丁二酯(PBS)共混时的增塑剂,通过熔融加工制得PHBV/PBS共混物。利用熔体流动速率仪、差示扫描量热仪、X射线衍射仪)、万能材料试验仪、扫描电子显微镜等研究PHBV/PBS共混物的熔体流动速率、热性能、晶胞结构、力学性能、相形态等性能。结果表明,随着增塑剂添加量的增加,共混物性能发生显著变化。当PEG和TEC用量均为10份(质量份)时,共混物的熔体流动速率分别增大到纯共混物的约3倍和1.8倍;PEG和TEC均使共混物的拉伸断裂伸长率先增加后降低,其中PEG和TEC的含量分别为2.5份和10份时,共混物有最大断裂伸长率;共混物的结晶(Tc)和熔融温度(Tm),随着两种增塑剂量增加均略有下降。扫描电镜照片表明两种增塑剂对共混物中两相的分散起到促进作用。

Blends of poly （hydroxbutyrate-co-hydroxyvalerate）/poly （ butylene succinate） （PHBV/PBS） were prepared by means of melting mixing added with triethyl citrate （TEC） and polyethylene glycol （PEG） as plasticizers respectively. The melting rate, thermal, crystalline, mechanical properties and phase morphology structure of the blends were characterized by means of MFI, DSC, XRD, SEM and tensile tester. The results showed that the performance of the blends changed significantly with the increase of the content of plasticizers. When the content of plasticizers （PEG and TEC） was 10 phr, the melt flow rate of blends was 3 times and 1. 8 times more than pure PHBV/PBS blend respectively. The elongation at break was the maximum wherein the contents of PEG and TEC were 2. 5 phr and 10 phr. The crystalline temperature （Tc） and melting temperature （Tm） were slightly decreased when the amount of two plasticizers increase＆ SEM micrographs indicated that the joining of both plastieizers promoted interface combination between two phases.