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扩链剂长度和分子结构对醚基聚氨酯相分离和流变性能的影响
Polymer Bulletin
(
IF
3.1
)
Pub Date : 2021-10-11
, DOI:
10.1007/s00289-021-03907-3
Mohammadali Pourmohammadi-Mahunaki
,
Vahid Haddadi-Asl
,
Hossein Roghani-Mamaqani
,
Mojtaba Koosha
,
Mohammad Yazdi
聚氨酯合成中不同类型的扩链剂会影响其结构、机械和流变性能。研究了扩链剂长度、官能度和反应物摩尔比对以聚(氧四亚甲基)二醇为软链段、甲苯二异氰酸酯为硬链段的聚氨酯弹性体不同性能的影响。使用不同的扩链剂合成聚氨酯样品,包括甘油作为三官能团,1,2-丙二醇、1,4-丁二醇和 1,6-己二醇作为双官能团含羟基化学品。傅里叶变换红外光谱、X 射线衍射、流变力学分析、动态机械热分析、差示扫描量热法和应力应变分析用于产品的表征。通过硬链段和软链段的相分离,观察到两种不同的玻璃化转变温度。增链剂和硬链段中二异氰酸酯之间的相分离和氢键结合程度的增加导致更高的机械性能。随着硬链段数量的增加,由于氢键的程度更高,聚合物的韧性更高。
"点击查看英文标题和摘要"
Effect of chain extender length and molecular architecture on phase separation and rheological properties of ether-based polyurethanes
Different types of chain extenders in the synthesis of polyurethanes affect its structural, mechanical, and rheological properties. Effects of chain extender length, functionality, and molar ratio of the reactants on different properties of polyurethane elastomers based on poly (oxytetramethylene)glycol as the soft segment and toluene diisocyanate as the hard segment were investigated. Polyurethane samples were synthesized using different chain extenders including glycerol as the trifunctional and 1,2-propanediol, 1,4-butanediol, and 1,6-hexanediol as the bi-functional hydroxyl-containing chemicals. Fourier-transform infrared spectroscopy, X-ray diffraction, rheomechanical analysis, dynamic mechanical thermal analysis, differential scanning calorimetry, and stress–strain analysis were used for characterization of the products. By phase separation of the hard and soft segments, two different glass transition temperatures were observed. Increasing phase separation and degree of hydrogen bonding between the chain extender and diisocynates in the hard segments were resulted in higher mechanical properties. With increasing the amount of hard segment, a higher polymer toughness is determined due to higher degree of hydrogen bonding.
更新日期:2021-10-11