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首页> 外文期刊>Journal of Applied Polymer Science >The Effects of Solvent Polarity and pKa on the Absorption of Solvents into Poly(glutaric acid-glycerol) Films
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The Effects of Solvent Polarity and pKa on the Absorption of Solvents into Poly(glutaric acid-glycerol) Films

机译：溶剂极性和pKa对溶剂在聚戊二酸-甘油膜中吸收的影响

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摘要

In this study, solvent absorption into the matrices of poly(glutaric acid-glycerol) films has been evaluated. It was determined that the combined effects of polarity and the size and shape of the solvent molecule, rather than pKa, have the most significant influence on absorption into the films. Polar aprotic solvents (with solvent polarity index values >4) such as 1,4-dioxane (absorbed 163.8% 6 0.3% [w/w] of the original weight of the polymer), pyridine (200.4% 6 3.5%), and dimethyl sulfoxide (186.0% 6 11.4%) were among the highest absorbed solvents into the polymer matrix. Solvents with polarity index values ≤4.0 were absorbed poorly (≤5.3% 6 1.5%). The polymer films only absorbed ≤26.5% 6 2.1% of their weight of most protic solvents (water and mono-alcohols) but absorbed 72.6% 6 6.5% of ethylene glycol, a diol. The only high absorbing polar protic solvent was acetic acid (131% 6 13.1%). Except for chloroform, ethyl acetate, and ethanol, all of the solvents examined displayed small increases in absorption (7.8%, on average) when the films were desorbed and used again to absorb solvent. Erosion of the films ranged from 0.0% 6 0.0% to 22.0% 6 3.2% after 2–10 h absorption cycles. Miscible (7.7% 6 2.3% to 15.1% 6 2.2%) and immiscible (12.3% 6 6.4% to 80.0% 6 1.9%) solvents were preferentially absorbed from aqueous solutions. However, up to approximately 5% of those absorption values could be from water absorption.
机译：在这项研究中，已经评估了溶剂吸收到聚（戊二酸-甘油）薄膜的基质中。已经确定，极性，溶剂分子的大小和形状而不是pKa的综合作用对薄膜的吸收影响最大。极性非质子溶剂（溶剂极性指数值大于4），例如1,4-二恶烷（吸收的聚合物原重的163.8％6 0.3％[w / w]），吡啶（200.4％6 3.5％）和二甲基亚砜（186.0％6 11.4％）是被吸收到聚合物基质中的溶剂最高的溶剂。极性指数值≤4.0的溶剂吸收不良（≤5.3％6 1.5％）。聚合物薄膜仅吸收占其大部分质子溶剂（水和一元醇）重量的≤26.5％6 2.1％，但吸收72.6％6 6.5％的乙二醇（一种二醇）。唯一的高吸收质子惰性溶剂是乙酸（131％6 13.1％）。除氯仿，乙酸乙酯和乙醇外，当薄膜解吸并再次用于吸收溶剂时，所有检测到的溶剂均显示出少量吸收增加（平均7.8％）。在2-10小时的吸收周期后，薄膜的侵蚀范围为0.0％6 0.0％至22.0％6 3.2％。从水溶液中优先吸收混溶性溶剂（7.7％6 2.3％至15.1％6 2.2％）和不混溶性溶剂（12.3％6 6.4％至80.0％6 1.9％）。但是，这些吸收值中大约有5％可能来自吸水率。

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