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背景:将热塑性聚氨酯弹性体与双酚A型聚砜或聚甲基丙烯酸甲酯共混可改善热塑性聚氨酯弹性体、双酚A型聚砜、聚甲基丙烯酸甲酯的性能,还可拓宽其应用领域。但共混物的性能主要取决于共混物的相容性。用稀溶液黏度法测定聚合物共混物相容性理论已经很成熟,但关于用稀溶液黏度法测定热塑性聚氨酯弹性体/聚砜和热塑性聚氨酯弹性体/聚甲基丙烯酸甲酯两种聚合物共混体系相容性的研究未见报道。目的:稀溶液黏度法观察热塑性聚氨酯弹性体/聚砜和热塑性聚氨酯弹性体/聚甲基丙烯酸甲酯2种聚合物共混体系的相容性,验证μ和α两类判据在判断聚合物共混体系相容性方面的一致性。设计:观察对比分析。单位:河南科技大学化工与制药学院。材料:热塑性聚氨酯弹性体由洛阳市吉明化工有限公司提供;聚砜由大连第一塑料厂提供;聚甲基丙烯酸甲酯由本实验室合成;N,N-二甲基甲酰胺由北京化工厂提供。方法:实验于2006-05在河南科技大学高分子科学与纳米技术重点实验室完成。以N,N-二甲基甲酰胺为溶剂,配置不同浓度的热塑性聚氨酯弹性体/聚砜和热塑性聚氨酯弹性体/聚甲基丙烯酸甲酯两种聚合物共混体系。在(25.00±0.01)℃的恒温槽中进行测定。用内径0.5～0.6mm的乌氏黏度计分别测热塑性聚氨酯弹性体/聚砜和热塑性聚氨酯弹性体/聚甲基丙烯酸甲酯两种聚合物共混溶液的流动特性,秒表记录时间,由时间得出相对黏度,进一步可得增比黏度。由实验得到的相对黏度、增比黏度及其他数据,可计算出两种聚合物共混体系的μ值和α值。主要观察指标:两种聚合物共混体系在乌氏黏度计中的流出时间。结果:热塑性聚氨酯弹性体/聚砜共混体系,μ﹥0,α﹥0,表明热塑性聚氨酯弹性体/聚砜共混物相容。热塑性聚氨酯弹性体/聚甲基丙烯酸甲酯共混体系,μ<0,α<0,表明热塑性聚氨酯弹性体/聚甲基丙烯酸甲酯共混物不相容。结论:μ、α两类判据在判定聚合物共混物相容性方面具有一致性。稀溶液黏度法操作简单,在测定聚合物共混物相容性方面具有一定的实用价值。
BACKGROUND: Blending thermoplastic polyurethane elastomers with bisphenol A-type polysulfones or polymethylmethacrylates improves the properties of thermoplastic polyurethane elastomers, bisphenol A-type polysulfones, and polymethylmethacrylates as well as widening Application areas. However, the properties of the blend mainly depend on the compatibility of the blend. The theory of dilute solution viscosity to determine the compatibility of polymer blends has been very mature, but with dilute solution viscosity method for the determination of thermoplastic polyurethane elastomer / polysulfone and thermoplastic polyurethane elastomer / polymethyl methacrylate two polymers Blending system compatibility studies have not been reported. OBJECTIVE: The dilute solution viscosity method was used to observe the compatibility of thermoplastic polyurethane elastomer / polysulfone and thermoplastic polyurethane elastomer / polymethylmethacrylate blend system. The two kinds of criteria, μ and α, Compatibility of blends compatibility. Design: Observation and comparative analysis. Unit: Henan University of Science and Chemical and Pharmaceutical College. Material: Thermoplastic polyurethane elastomer is provided by Luoyang Jiming Chemical Co., Ltd .; polysulfone is supplied by Dalian No.1 Plastic Factory; polymethyl methacrylate is synthesized by our laboratory; N, N-dimethylformamide is provided by Beijing Chemical Plant . Methods: The experiment was performed in Key Laboratory of Polymer Science and Nanotechnology of Henan University of Science and Technology in 2006-05. N, N-dimethylformamide as solvent, the configuration of different concentrations of thermoplastic polyurethane elastomer / polysulfone and thermoplastic polyurethane elastomer / polymethyl methacrylate two polymer blends. The measurement was performed in a thermostatic chamber of (25.00 ± 0.01) ° C. The flow characteristics of the thermoplastic polyurethane / polysulfone and thermoplastic polyurethane / polymethylmethacrylate blend solutions were measured by using an Ubbelohde viscometer with an inner diameter of 0.5-0.6 mm. The stopwatch recording time was measured by time The relative viscosity, further available to increase the viscosity. From the experimental results of relative viscosity, specific viscosity and other data, we can calculate the μ value and α value of the two polymer blends. MAIN OUTCOME MEASURES: Outflow time of two polymer blends in Ubbelohde viscometer. Results: Thermoplastic polyurethane elastomer / polysulfone blends, μ> 0, α> 0, indicating that the thermoplastic polyurethane elastomer / polysulfone blends are compatible. Thermoplastic polyurethane elastomer / polymethylmethacrylate blends, μ <0, α <0, indicate that the thermoplastic polyurethane elastomers / polymethacrylate blends are incompatible. Conclusion: The two kinds of criteria of μ and α are consistent in judging the compatibility of polymer blends. The dilute solution viscosity method is simple to operate and has certain practical value in determining the compatibility of polymer blends.