亚磷酸三苯酯对r-PETG扩链反应和力学性能的影响  

Effect on Extending Chain Reaction and Mechanical Property of r-PETG in the Presence of Triphenyl Phosphite

作　　者：周峰[1] 张月航[1] 吕奇[1] 崔美杰[1] 严海彪[1] 

机构地区：[1]湖北工业大学轻工学部材料学院,绿色轻工材料湖北省重点实验室,湖北武汉430068

出　　处：《塑料》2016年第2期77-80,共4页Plastics

摘　　要：采用亚磷酸三苯酯(TPPi)为扩链剂,通过扩链反应来提高回收的共聚酯(r-PETG)的分子量,增加其特性黏度。采用凝胶渗透色谱(GPC)、熔融指数仪和红外光谱(IR)考察了TPPi的用量、扩链反应温度和混炼转速对r-PETG扩链反应的影响。在最佳反应条件(TPPi为2.0%、温度200℃、转速60 r/min)下,r-PETG的熔体流动速率(MFR)由12.83 g/10 min降低到4.24 g/10min;数均分子量(M_n)由2.52×10~4g/mol提高到3.35×10~4g/mol,提高了33.3%;拉伸强度从41.2 MPa增加到了62.3 MPa;而无缺口冲击强度从38.4 k J/m^2大幅度提高至66.8 k J/m^2。红外光谱证实了扩链反应前、后r-PETG的分子结构没有变化。Triphenyl phosphite （TPPi） was used as a chain extender to increase the molecular weight and intrinsic viscosity of recycled copolyester （r-PETG） by chain-extension reaction in the torque rheometer. The influences of the amount of TPPi, reaction temperature and the rotor speed were studied on the mixing torque of r-PETG by fusion index instrument, gel permeation chromatography（ GPC）, infrared spectroscopy （IR）. The optimum processing conditions were reached （200 ℃, 60 r/min,2.0% chain extender） , with the melt index of the r-PETG decreased from 12.83 to 4. 24 g/10min. But the number average molecular weight （M） of the r-PETG increased from 2.52×10^4to 3.35 ×10^4 g/mol. Meanwhile, the tensile strength increased from 41.2 to 62.3 MPa and the non-notched impact strength increased from 38.4 to 66. 8 kJ/m^2 , respectively. The infrared spectrum proved that r-PETG＇ s molecular structure was kept after the reaction.

关 键 词：r-PETG 亚磷酸三苯酯 扩链剂 特性黏度 扩链反应 

分 类 号：TQ323.41[化学工程—合成树脂塑料工业]