Thermosetting polymers have the distinct advantage of being chemically and thermally resistant materials used in many high-performance applications.()

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Totally elastic deformation occurs very quickly, and the strain is independent of time.()
Polycarbonate has a lower Tg than polyethylene.()
Which one (s) of the following is or are correct?()
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Poly(1,4-cis-butadiene) has a higher Tg than Poly(1,4-trans-butadiene) because the cis -form. reduces the energy barrier for rotation of adjacent bonds.()
Fillers are most often added to improve tensile strength, and ().
营业场所严禁吸烟,禁止存放易燃易爆物品。()
Through controlled ving free-radical polymerization (CRP), molecular weight distribution could be narrowed greatly, and PDI could be near to 1.()
Which of following properties are the problem natural rubber in practical application?()
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The formation of cross-linked structures in synthetic rubbers is usually called vulcanization.()
录音录像资料至少保留到产品终止日起6个月后或合同关系解除日起12个月后,发生纠纷的要保留到纠纷最终解决后。()
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The molecular weight distribution, PDI, could be a value near to 1, when polymers are produced by living or controlled polymerizations.()
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