mprovement of the Low-Temperature Property of Aliphatic Polycarbonate Glycols-based Polyurethane Elastomers
mprovement of the Low-Temperature Property of Aliphatic Polycarbonate Glycols-based Polyurethane Elastomers
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脂肪族聚碳酸酯二醇类聚氨酯弹性体低温性能的改善
DOI：
10.1166/sam.2015.1913
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
K. Yoshinaga
中科院分区：
文献类型：
--
作者：
K. Kojio;M. Furukawa;M. Shimada;M. Shimada;T. Komatsu;S. Nozaki;S. Motokucho;K. Yoshinaga
研究了基于不同分子量（HO-[(CH2) m OC(=O)O] n -(CH2) m -OH，m = 3 和 6，Mn = 1000–3000）的基于脂肪族碳酸酯二醇（PC-二醇）的聚氨酯弹性体（PUE）的结构-性能关系，以改善其低温性能。差示扫描量热法 (DSC) 测量表明，PUE 中软链段的玻璃化转变温度 (Tg) 降低了约 10%。 10-25℃，随着PC-乙二醇分子量的增加，结晶硬段表现出更大的熔化热。这一趋势清楚地表明，随着 PC-乙二醇分子量的增加，PUE 的微相分离程度变得更强。在拉伸试验中，杨氏模量和拉伸强度随着微相分离程度的增加而增加。换句话说，PC-乙二醇分子量的增加使 PUE 具有较低的 Tg 和优异的机械性能。
Structure-property relationship of polyurethane elastomers (PUEs) based on aliphatic carbonate glycols (PC-glycols) with various molecular weights (HO-[(CH2) m OC(=O)O] n -(CH2) m -OH, m = 3 and 6, Mn = 1000–3000) were investigated to improve their low-temperature property. Differential scanning calorimetry (DSC) measurement revealed that the glass transition temperature (Tg ) of the soft segment in the PUEs decreased ca. 10–25 °C and crystallized hard segment exhibited larger heat of fusion with increasing molecular weight of the PC-glycol. This trend clearly implies that the degree of microphase separation of the PUEs became stronger with an increase in molecular weight of the PC-glycol. In the tensile testing, Young's modulus and tensile strength increased with increase in the degree of microphase separation. In other words, an increase in molecular weight of the PC-glycol gives the PUEs bearing lower Tg and superior mechanical properties.