Revisited Kinetic Chain Length and Reactivity Ratio Approaches for Linear Polymers and Copolymers

The Open Macromolecules Journal Pub Date : 2008-03-04 DOI:10.2174/1874343900802010001

M. Fares

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引用次数: 4

Abstract

Two revisited mathematical kinetic relationships were derived, evaluated and applied on linear polymers such as polystyrene and copolymers such as (NIPAAm-alt-HEMA) and (MAAm-alt-HEMA) copolymers respectively. The va- lidity of these equations was successfully verified. The first relationship, equation 12, interrelates exponentially kinetic chain length, average molecular weight and degree of polymerization of linear polymers with different temperatures. Fur- thermore; equation 12 could novelly define the rate of polymerization (Rp) and consequently the overall activation energy (￻ E) of the polymerization process could be determined. The second derived relationship interrelates the reactivity ratio product (r1r2) of two monomers interacting with each other, with different temperature. Application of equation 16 could determine the behavioral sequence of monomer 1 toward monomer 2 in the copolymerization process. The value of (E12+E21)￻ (E11+E22) could result with the determination of type of copolymers formed. The reactivity ratio values for (NIPAAm-alt-HEMA) and (MAAm-alt-HEMA) copolymers were determined using Kelen-Tudos technique.

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线性聚合物和共聚物的动力学链长和反应性比方法

在线性聚合物(如聚苯乙烯)和共聚物(如(NIPAAm-alt-HEMA)和(MAAm-alt-HEMA)共聚物(NIPAAm-alt-HEMA)上分别推导、评估和应用了两种重新审视的数学动力学关系。成功地验证了这些方程的有效性。第一个关系式，即公式12，将线性聚合物在不同温度下的指数动力学链长、平均分子量和聚合度联系起来。皮毛——thermore;公式12可以定义聚合速率(Rp)，从而可以确定聚合过程的总活化能(￻E)。第二种推导关系是两个单体在不同温度下相互作用的反应性比积(r1r2)的相互关系。应用方程16可以确定共聚过程中单体1对单体2的行为顺序。通过(E12+E21)￻(E11+E22)的值可以确定共聚物的种类。用Kelen-Tudos法测定了(NIPAAm-alt-HEMA)和(MAAm-alt-HEMA)共聚物的反应性比值。

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The Open Macromolecules Journal

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