CROSSLINKING AQUEOUS POLYVINYL PYRROLIDONE) SOLUTIONS BY PERSULFATE
CROSSLINKING AQUEOUS POLYVINYL PYRROLIDONE) SOLUTIONS BY PERSULFATE
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DOI：
10.1002/app.1979.070230823
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发表时间：
1979-01-01
影响因子：
3
通讯作者：
THURSTON, DA
中科院分区：
文献类型：
--
作者：
ANDERSON, CC;RODRIGUEZ, F;THURSTON, DA
含有 1.5 至 6.5 wt% 聚（乙烯基吡咯烷酮）PVP 的水溶液通过与过硫酸钾反应转化为稳定的凝胶。高模量凝胶需要大量的过硫酸盐，通常需要 PVP 重量的 50% 至 150%。通过使凝胶作为简单扭摆中的恢复元件，可以在反应过程中测量剪切模量G'。模量增加到最大平台值 G′max 可以表示为一阶过程： \documentclass{article}\pagestyle{empty}\begin{document}\end{document} 其中反应时间和 K 随聚合物浓度的平方根增加。G′max 随聚合物浓度的二次方变化。它还随着反应温度的升高和过硫酸盐/PVP 比率的升高而迅速增加。
Aqueous solutions with 1.5 to 6.5 wt‐% poly(vinyl pyrrolidone), PVP, are converted to stable gels by reaction with potassium persulfate. Large quantities of persulfate are needed for high‐modulus gels, 50% to 150% of the weight of PVP being required typically. The shear modulusG′ can be measured during reaction by making the gel the restoring element in a simple torsion pendulum. The increase in modulus to a maximum plateau value ofG′maxcan be expressed as a first‐order process: \documentclass{article}\pagestyle{empty}\begin{document}\end{document} Wheretis elapsed time of reaction andKincreases with the square root of polymer concentration.G′maxvaries with the second power of the polymer concentration. It also increases rapidly with increasing temperature of reaction and with persulfate/PVP ratio.