题目内容

What is random coil?Why polymers always showrandom coil in solution or melt states? (用中文回答）

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List the main differences in molar mass between polymers and other chemical compounds. ( answer in English)

写出数均分子量和重均分子量的计算公式。

Explain the terms of "mono-disperse" and "polydispersity index".( answer in English)

列出测定聚合物分子量及其分布的三种主要方法。并阐述基本原理，基本过程。