Poly (ethylene terephthalate) (PET) is widely used in the fields of the fiber, film and engineering plastics because of its excellent rigid, heat and chemical resistance properties.
聚对苯二甲酸乙二醇酯(PET)具有高的刚性、耐热性和耐化学药品性等优良性能，被广泛应用于纤维、薄膜和工程塑料等领域。
But the poly resistance has got lower temperature coefficient and lower Sheet resistance than well resistance So we choose the resistance type depending upon the requirements.
但多晶硅电阻有较低的温度系数和低的方块电阻，应根据需要来选择电阻。
The methods for modifying heat resistance of poly(vinyl chloride) (PVC) resins were reviewed, including blending modification, copolymerization modification and chlorination modification, etc.
对聚氯乙烯（PVC）树脂耐热改性方法的研究进行了综述。 PVC树脂耐热改性方法有共混改性、共聚合改性、氯化改性和其他改性。
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