MDI-based polyurethane ionomers. 2. Structure-property relationships
MDI-based polyurethane ionomers. 2. Structure-property relationships
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基于 MDI 的聚氨酯离聚物。
DOI：
10.1021/ma00182a027
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发表时间：
1988
期刊：
影响因子：
5.5
通讯作者：
S. Cooper
中科院分区：
文献类型：
--
作者：
Daychyuan Lee;R. Register;Chang;S. Cooper
研究了多元醇相对分子质量和电离水平对弹性聚氨酯离聚体性能的影响。橡胶平台模数取决于材料中离子基团的比例。共聚物的玻璃化转变温度可用Fox方程描述。随着电离能级的增加，由于电离的MDI单元的聚集，基质Tg下降。广角X射线散射表明，由短链聚四氢呋喃多元醇制备的离聚体没有应力诱导结晶。将一种新的形态模型应用于小角X射线散射数据，并将其结果与物理特性趋势进行了比较。
The effects of polyol molecular weight and ionization level on the properties of elastomeric polyurethane ionomers were studied. The rubbery plateau modulus was found to depend on the fraction of ionic groups in the material. For the unionized polyurethane, the glass transition temperature of the copolymer was adequately described by the Fox equation. As the ionization level increased, the matrix T g dropped due to aggregation of the ionized MDI units. Wide-angle X-ray scattering revealed no stress-induced crystallization in an ionomer prepared from a short-chain poly (tetramethylene oxide) polyol. A new morphological model is applied to small-angle X-ray scattering data and the results are compared with the physical property trends.