摘要
利用ＰＢＴ、ＰＥＴ的特性参数，通过不同组份比ＰＢＴ／ＰＥＴ共混体系的混合自由能ΔＧｍ，从理论上预测其相容性。在一定的条件下ΔＧｍ＜０，ＰＢＴ、ＰＥＴ可以相容。示差扫描量热法（ＤＳＣ）和动态力学粘弹谱（ＤＭＡ）分析结果表明：在不同配比的ＰＢＴ／ＰＥＴ共混体系中均只能观察到一个玻璃化转变温度Ｔｇ，说明其非晶态是相容的。共混体系的Ｔｇ介于两纯组份的Ｔｇ之间，随ＰＢＴ含量的增加而下降。对不同组份比共混体系的玻璃化转变过程从分子链段运动的角度进行分析。
According to the characteristics of PBT and PET, the mixing free energyΔ G m was theoretically calculated to predict the compatibility of poly(ethy lene terephthalate) and poly (butylene terephthalate) blends with diffferentcompositions On the desirable conditions, Δ G m<0, it indicated that PBT and PET are compatible The results from DSC and DMA enhanced the theoretical predictions Although the composition of PBT and PET can be varied, only one glass transition temperature T g can be observed, which also indicated that the amorphous phase of PBT and PET is compatible T g of the blends varied with composition, and its value is between the T g of the two purecomponents With increasing the content of the PBT in the blends, T g of blends decrease The glass transition behavior of the blends was discussed in the view of molecular segments motion
出处
《功能高分子学报》
CAS
CSCD
1996年第3期351-356,共6页
Journal of Functional Polymers
关键词
PET
PBT
共混物
相容性
工程塑料
Poly(ethylene terephthalate), Poly(butylene terephthalate), Blend, Compatibility
