Fatigue Damage Mechanisms in Short Fiber Reinforced PBT+PET GF30

Polyethylene terephthalate (PET) is one of the most important synthetic materials at present. Mainly used in the production of fibers, films and hollow containers. PET is cheap and has excellent wear resistance, heat resistance, chemical resistance, electrical insulation and high mechanical strength. It has been used in automobiles, motors, electronics, household appliances, machinery and other industries. When PET is used as an engineering plastic, its shortcomings are the slow crystallization speed, poor impact performance and high water absorption at the commonly used processing mold temperature (70～110℃), which limit its wide application. Since the 1970s, people have tried various ways to improve PET. Modification research mainly focuses on adding crystallization nucleating agent to speed up its crystallization speed and through blending, enhancing and improving impact strength.

PBT is a new type of engineering plastic that developed rapidly in the 1970s. Its general mechanical properties are better than PET, and it has good toughness and can be molded. PET and PBT have similar chemical structures, so they have good compatibility. After the two are blended, they can complement each other. The resulting product has high impact strength and low cost. PET/PBT blends also have excellent chemical stability, thermal stability, strength, rigidity and abrasion resistance, and their products have good gloss.