AB—交联聚合物(PPU/PS)中分子运动和相容性的固态高分辨NMR研究(英文)

SOLID STATE HIGH RESOLUTION NMR STUDY OF THE MOLECULAR MOTION AND COMPATIBILITY OF AB-CROSSLINKED POLYMER BASED ON PPU/PS

本文用固体高分辨NMR技术测量了AB-交联聚合物(即ABCP)PPU/PS(聚氨酯/聚苯乙烯)中侧甲基的^(13)C弛豫时间T_1。使用分子内旋转的平均谱密度函数分析了ABCP中CH_3侧基的内旋转运动。结果表明PPU/PS,ABCP中PPU的CH_3侧基运动与PS的含量有关。当体系发生相反转时,侧甲基的运动也发生一转变。这反映了侧甲基的运动与ABCP的宏观性质密切相关。对该ABCP体系还进行了~1HT_(1ρ)的测量,分析了其相容性。

The 13C T1s of side-CH3 group in PPU/PS, AB-crosslinked polymer were measured by using high resolution solid state NMR technique. The motion of side-CH3 group in this system was analyzed by means of the average spectral density functions of internal rotation. The results showed that the motion of side-CH3 group of PPU in PPU/PS ABCPs depends on the content of PS. There is a transition in -CH3 motion when the phase is reversed. The motion of-CH3 group is related closely to the macroscopic properties of the ABCP. The measurements of 1H Tlρ were also carried out.