以下为句子列表：
英文: Abstract: The mathematical model that describes the reaction kinetics and molecular weight distribution for the polycondensation reaction process is developed by methods of reaction extent and generation function,in which an industrial process of poly(eth
中文: 文摘:以一个工业化聚酯生产过程为例，将反应度法和生成函数作为工具，建立了描述此类缩聚反应过程的反应动力学及其分子量分布的数学模型，并介绍了求解数学模型的方法。
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英文: It was found that loop reactor could narrow the molecular weight distribution, increase the content of carbonate in product molecules and improve catalyst efficiency.
中文: 研究发现，环流反应器能够使产品分子量分布变窄，提高产品中碳酸酯基团含量及催化剂的催化效率。
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英文: The molecular weight distributions, infra-red, ultraviolet and nuclear magnetic resonance spectra for the polysilane polymers have been described.
中文: 本文还讨论了这些聚硅烷的分子量分布以及红外、紫外、核磁共振等光谱性质。
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英文: The products are polyethers synthesized with new catalyst, characterized by low unsaturation, narrow molecular weight distribution, high activity and high primary hydroxyl content.
中文: 本产品系新型催化剂合成的聚醚，其特点是不饱和度低，分子量分布窄，活性高，伯羟基含量高。
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英文: Using 80% dipropylene glycol and 20% 1,4-butanediol as molecular regulator could also narrow the molecular weight distribution and reduce the amount of smaller molecules in product.
中文: 研究还发现分子量调节剂对产品分子量分布有较大影响，采用混合型调节剂也能够使分子量分布变窄并降低小分子物质含量。
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