Hydrogen bonding, glass transition, water absorption, and plasticization are studied as a function of hydrogen bond donor concentration in the chain of a non-isocyanate polyhydroxyurethane system, synthesized by solvent-free aminolysis of a poly(ethylene oxide) (PEO) based cyclic carbonate. The concentration of hydrogen bond donors is controlled by varying the ratio of diaminobutane (DAB) and triethylenetetramine (TETA) in the amine component. Introduction of secondary amino groups enhances hydrogen bonding and rigidity of the chain, and, as a result, slows down dynamics, as evidenced by an increase in glass transition temperature. Hydroxyurethane groups are the primary hydration sites despite the hydrophilicity of the polyether. Secondary amino groups act as secondary hydration sites which further increases water sorption capacity. The Couchman-Karasz model describes excellently the dependence of glass transition temperature on composition in both dry and hydrated systems.

中文翻译：

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聚环氧乙烷双（环状碳酸酯）基亲水性非异氰酸酯多羟基聚氨酯：聚合物-水相互作用和玻璃化转变行为


研究了氢键、玻璃化转变、吸水性和增塑作用，作为非异氰酸酯多羟基聚氨酯体系链中氢键供体浓度的函数，该体系是通过聚环氧乙烷 (PEO) 基环的无溶剂氨解合成的。碳酸盐。通过改变胺组分中二氨基丁烷（DAB）和三亚乙基四胺（TETA）的比例来控制氢键供体的浓度。仲氨基的引入增强了氢键和链的刚性，因此减缓了动力学，玻璃化转变温度的增加证明了这一点。尽管聚醚具有亲水性，但羟基氨基甲酸酯基团是主要的水合位点。仲氨基作为二级水合位点，进一步增加吸水能力。 Couchman-Karasz 模型很好地描述了干燥和水合体系中玻璃化转变温度对组成的依赖性。