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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >Molecular weight effect on the quaternization of poly(4-vinylpyridine) with alkylbromide
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Molecular weight effect on the quaternization of poly(4-vinylpyridine) with alkylbromide

机译：分子量对烷基溴化物对聚（4-乙烯基吡啶）季铵化的影响

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摘要

The objective of this work is to study the influence of molecular weight on the quaternization of poly(4-vinylpyridine) (P4VP) with octyl and dodecyl bromide. The P4VP with different molecular weight was synthesized by radical polymerization. The molecular weight was determined by viscosimetric and light scattering. A set of copolymers containing the poly(4-vinylpyridine) of different molecular weights quaternized with octyl and dodecyl bromide (C _8Br and C _(12)Br) were prepared. In order to determine the solubility limit of each copolymer; phase diagramswere established according to thewater percentage in themixturewater-ethanol. Empiric laws for the rate maximum (Tmax) andMw were proposed. We have considered six P4VP samples in wide intervals of molecular weights: 0.75.10 ~4 to 94.10 ~4 g/mol. The ratio between the high size and the small size is 106.7. The maxima rate of quaternization (Tmax) and the initial constants rate k0 increase with P4VP molecular weights. Critical time for the quaternization kinetics is 360 h, which is independent of Mw. The length of alkyl chain from C _8 does not affect the quaternization kinetics. The solubility of copolymers in water decreases with macromolecular weight,which is not the case for P4VP homopolymer.
机译：这项工作的目的是研究分子量对辛基和十二烷基溴化物对聚（4-乙烯基吡啶）（P4VP）季铵化的影响。通过自由基聚合合成了不同分子量的P4VP。分子量通过粘度和光散射测定。制备了一组包含不同分子量的聚（4-乙烯基吡啶）的共聚物，该共聚物被辛基和十二烷基溴化物季铵化（C _8Br和C _（12）Br）。为了确定每种共聚物的溶解度极限;根据水-乙醇混合物中的水百分比建立相图。提出了最大速率（Tmax）和Mw的经验定律。我们已经考虑了六个P4VP样品，其分子量分布范围很广：0.75.10〜4至94.10〜4 g / mol。高尺寸和小尺寸之间的比例为106.7。季铵化的最大速率（Tmax）和初始常数速率k0随着P4VP分子量的增加而增加。季铵化动力学的关键时间为360 h，与Mw无关。来自C -8的烷基链的长度不影响季铵化动力学。共聚物在水中的溶解度随大分子量而降低，而P4VP均聚物则不然。

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