COMPATIBILIZING EFFECT OF POLY(ETHYLENE OXIDE)-B-POLYSTYRENE-B-POLY(ETHYLENE OXIDE) IN PHENOLPHTHALEIN POLY(ETHER ETHER KETONE) POLY(2,6-DIMETHYL-1,4-PHENYLENE OXIDE) BLENDS

The morphology and mechanical behaviour of phenolphthalein poly(ether ether ketone) (PEK-C)/poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) blends has been investigated. A poly(ethylene oxide)-b-polystyrene-b-poly(ethylene oxide) (PEO-PS-PEO) triblock copolymer was used as compatibilizer. It was found that PEO-PS-PEO has a compatibilizing effect on the PEK-C/PPO blends. The addition of PEO-PS-PEO to the blends greatly improves phase dispersion and interfacial interfacial adhesion and also enhances the ultimate tensile strength and Young's modulus at compositions ranging from 30 to 70% PEK-C. However, all the values of the ultimate tensile strength within the whole composition range are lower than those expected by simple additivity, probably owing to the poor mechanical properties of PEO-PS-PEO copolymer.

HDPE,LLDPE或LDPE高取向薄膜微结构的电子显微学研究

木工作用透射电子显微术及电子衍射技术研究3种PE(HDPE,LLDPE或LDPE)均聚物高取向薄膜的微结构。定量测定了它们的结晶尺寸。通过倾斜样品电子显微学研究确定了不同种PE纤维结构的对称性。

γ射线辐射交联LDPE/CSM共混物的结构和性能

本文研究了~(69)Cγ射线辐照对LDPE/CSM共混物红外光谱和结晶度的影响。讨论了辐射交联LDPE/CSM共混物的力学性能、介电性能及热性能。

γ—辐射交联LDPE的物理性能(摘要)

本文研究γ—辐射交联LDPE的力学、介电和热性能,同时讨论其动态力学性能。结果表明:经250KGy剂量辐照后,抗张强度接近极大,约20Pa,而伸长率在50KGy左右剂量出现极大值,辐照交联后,tanδ略有增加,但在1kHz以内,室温下仍为10~(-4),ε在22左右,热学参数随剂量增加而下降。辐照交联后LDPE的贮能模量增加,多重转变温度Tα、Tβ和Tγ向高温方向移动,松弛强度有一定变化。图3表2参4