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首页> 外文期刊>Journal of Applied Polymer Science >Formation of monodisperse polyacrylamide particles by radiation-induced dispersion polymerization. I. Synthesis and polymerization kinetics
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Formation of monodisperse polyacrylamide particles by radiation-induced dispersion polymerization. I. Synthesis and polymerization kinetics

机译：通过辐射诱导的分散聚合反应形成单分散聚丙烯酰胺颗粒。一，合成与聚合动力学

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摘要

Highly monodisperse polyacrylamide (PAM) microparticles were directly prepared by radiation-induced dispersion polymerization at room temperature in an aqueous alcohol media using poly(N-vinylpyrrolidone) (PVP) as a steric stabilizer. Monomer conversion was studied dilatometrically and polymer molecular weight was determined viscometrically. The gel effect was found evidently from the polymerization kinetics curves. The influence of the dose rate, monomer concentration, stabilizer content, medium polarity, polymerization temperature on the polymerization rate, and the molecular weight of the polymer was examined. The polymerization rate (Rp) can be represented by Rp proportional to D-0.15[M](0.86)[S](0.47)[A/W](0.64) and the molecular weight 0 of the polymer can be represented by M-w proportional to D-0.19 [M](1.71)[S](0.43)[A/W](0.14) at a definite experimental variation range. The overall activation energy for the rate of polymerization is 10.57 kJ/mol (20-35degreesC). Based on these experimental results, the polymerization mechanisms were discussed primarily. (C) 2002 Wiley Periodicals, Inc. [References: 27]
机译：通过在室温下在水性醇介质中使用聚（N-乙烯基吡咯烷酮）（PVP）作为空间稳定剂，通过辐射诱导的分散聚合，直接制备高度单分散的聚丙烯酰胺（PAM）微粒。用对数法研究单体转化率，并用粘度法测定聚合物分子量。从聚合动力学曲线明显地发现了凝胶效应。考察了剂量率，单体浓度，稳定剂含量，介质极性，聚合温度对聚合速率和聚合物分子量的影响。聚合速率（Rp）可以用与D-0.15 [M]（0.86）[S]（0.47）[A / W]（0.64）成正比的Rp表示，聚合物的分子量0可以由Mw的比例表示。到D-0.19 [M]（1.71）[S]（0.43）[A / W]（0.14）在确定的实验变化范围内。聚合速率的总活化能为10.57 kJ / mol（20-35℃）。基于这些实验结果，主要讨论了聚合机理。 （C）2002 Wiley Periodicals，Inc. [参考：27]

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