摘要
通过熔融共混法制备了聚对苯二甲酸乙二醇酯(PET)与聚对苯二甲酸丙二醇酯(PTT)的共混物,采用差示扫描量热仪、动态热机械分析仪、万能电子试验机等对共混体系的热性能、动态力学性能及拉伸性能进行了测试。测得PET/PTT 共混体系只有1个玻璃化转变温度(T_g)和损耗峰,表明在非晶区完全相容,其中纯 PET 的了 T_g 为84℃,纯 PTT 的 T_g低于50℃;而双重熔融峰及热结晶峰宽化现象的出现表明,共混体系在晶区是部分相容,各组分倾向于分别进行有序化排列、单独结晶,其中纯 PET 的熔点为256℃,纯 PTT 的熔点为229℃;共混体系的拉伸模量和拉伸强度随 PTT 含量的增加旱上升趋势:但当共混比例接近时体系的拉伸模量和拉伸强度有所下降,共混比为5/5时的拉伸模量和拉伸强度分别低达1098 MPa 和51 MPa。
Poly（ethylene terephathalate） （PET） was blended with poly（trimethylene terephthalate） （PTT） via melt blending. The thermal, dynamically mechanical and tensile properties of PET/PTT blends were investigated by DSC, DMA, and tensile test. It shows that PET/PTT blends possess an excellent compatibility in amorphous phase. The Tg of neat PET and PTT is 84 and below 50 ℃, the melting points are 256 ℃ and 229℃, respectively. The chain segments of PET and PTT tend to crystallize separately in crystal phase corresponding to the appearances of two melting peaks and the width of the peak. Tensile modulus and tensile strength of blends increased with ascending PTT content. However, tensile modulus and tensile strength of blends decrease with the blend ratio approaching 0.5. The minimum tensile modulus and tensile strength of PET/PTT blends are 1 098 MPa and 51 MPa, respectively.
出处
《中国塑料》
CAS
CSCD
北大核心
2008年第5期20-24,共5页
China Plastics
