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首页> 外文期刊>Journal of Applied Polymer Science >Effect of temperature and thermodynamic quality of solvent over unperturbed chain dimensions of nylon 6
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Effect of temperature and thermodynamic quality of solvent over unperturbed chain dimensions of nylon 6

机译：溶剂的温度和热力学性质对尼龙6无扰链尺寸的影响

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摘要

A nylon 6 sample having average molecular mass 4.825 × 10~5 g mol~(-1) was fractionated into five different fractions with respect to molecular mass, which ranged from 3691 to 999,000 g mol-1. The light scattering and intrinsic viscosity measurements were made in m-cresol and its mixture with 1,4-dioxane. The second virial coefficient, radius of gyration and Mark Houwink's constant and unperturbed chain dimensions were determined by light scattering and viscosity measurement. It has been observed that all these parameters are composition of solvent and temperature dependent. The solvent having composition of 97% m-cresol and 3% dioxane, was best and it deteriorated with the increase/decrease in percentage of 1,4-dioxane in m-cresol. However, its thermodynamic quality was enhanced with the temperature. Such variation in quality of solvent was reflected in all the estimated parameters and showed maxima at this composition of solvent. The unperturbed dimensions obtained by different methods though, differed in values but showed same trend and NA-MKB method gave close results to the one obtained through [?· _o]. A new expression has also been proposed relating ko to solvent quality and temperature and the data obtained by us for nylon-6 and the one obtained from the literature for dextran obeyed this expression up to large extent irrespective of the solvent composition and temperature. The proposed equations have also been applied to dextran/methoxy ethylene and dextran/ethylene glycol systems and worked well.
机译：将平均分子量为4.825×10〜5 g mol〜（-1）的尼龙6样品相对于分子量分为五个不同的部分，范围为3691至999,000 g mol-1。在间甲酚及其与1,4-二恶烷的混合物中进行光散射和特性粘度测量。通过光散射和粘度测量来确定第二维里系数，回转半径和马克·霍温克的恒定链链尺寸。已经观察到，所有这些参数都取决于溶剂的组成和温度。组成为97％间甲酚和3％二恶烷的溶剂最好，并且随着间甲酚中1,4-二恶烷百分比的增加/降低而变差。但是，其热力学质量随温度而提高。溶剂质量的这种变化反映在所有估计的参数中，并在该溶剂组成下显示出最大值。尽管通过不同方法获得的不变尺寸值有所不同，但显示出相同的趋势，并且NA-MKB方法获得的结果与通过[？·_o]获得的尺寸接近。还提出了一种与溶剂质量和温度有关的新表达方式，并且我们从尼龙6中获得的数据以及从葡聚糖文献中获得的数据在很大程度上都遵守了该表达方式，而与溶剂的组成和温度无关。所提出的方程式也已经应用于葡聚糖/甲氧基乙烯和葡聚糖/乙二醇体系，并且效果很好。

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