Toughened Multiphase PBT Alloys Prepared By In-situ Reactive Extrusion And The Relationships Between Their Properties And Sub-Cluster Scales

Modern industry demands increaingly new materials with excellent properties. As a method to develop new polymeric materials, blending is no less important to modify their microstructures and thereby end-use properties. Superior properties can result through the combination of very different materials in polymer blends and composites. The correlation between properties and structure of polymer blends is more than critical for us to develop new blends with improved properties.PBT is an important engineering plastic, which has many merits but is fragile. So toughening for PBT has attracted great interesting of scientists In this thesis a wide range of PBT blends included PBT/POE, PBT/EVA, PBT/SEBS, PBT/ABS, PBT/EPDM, PBT/MBS (or MAS) was prepared through twin screw extruder. PBT/POE and PBT/EPDM blends were compatibilized by MAH through in-situ reactive extrusion. The compatibilizing effects of an epoxy resin (LER-2050) on the blend of PBT and MBS (methyl methacrylate-butadiene-styrene copolymer) or MAS (methyl methacrylate-butyl acrylate-styrene copolymer) core-shell impact modifiers were investigated. PBT/MBS (MAS)/Epoxy blends were also prepared by in-situ reactive extrusion. The rheology, crystallization kinetics, impact strength, morphology, and mechanical behavior of blends prepared above were researched. The research on PBT/Elastomer/UHMWPE blends explored PBT blends for self-lubricant materials, which can be used in bearings and slipping materials.Experimental facts showed that different blend systems express different mechanisms in the correlation between the property and the composition for their difference in compatibility. ABS, MBS and MAS are good impact modifier for PBT. Compatibilization is efficient to improve the properties of PBT blend.We have looked at how the various properties of Poly (butylene terephthalate) (PBT) and MBS (or MAS) blends are affected by the addition of an epoxy resin. The impact strength of the ternary blend increased dramatically with the addition of 1% Epoxy resin to the PBT/MBS blend, and supertough PBT alloy was obtained. Further addition of epoxy resin decreased the impact strength. At this point (1% Epoxy resin), the tensile strength and the ultimate elongation of the PBT80/MBS20/Epoxy blends with various...