中文摘要：

利用铜离子（Cu2＋）对聚氧乙烯（PEO）的配位作用所形成的对分子链运动的束缚,研究了链段受限下PEO的结晶和熔融行为.首先利用宽频介电松弛谱（BDS）对受限条件下PEO的松弛行为进行表征,结果表明,加入铜离子后PEO的β-过程和γ-过程的特征松弛时间都变长,说明PEO的链段协同运动和主链扭转运动都变得更加困难;松弛时间为评价受限程度提供了定量的依据.DSC的测试结果表明,受限条件下PEO的玻璃化转变温度（Tg）升高,同时出现冷结晶现象,说明Cu2＋配位作用确实对PEO的链段运动产生了束缚作用;同时PEO的结晶度和熔点都随着铜离子含量的提高而降低.WAXD结果表明,CuBr2在共混物中没有发生结晶,同时PEO的晶型没有发生改变.利用AFM进一步研究了PEO/CuBr2共混物薄膜的结晶形貌,发现在不同Cu2＋含量的共混物中PEO都形成伸直链晶体,片晶厚度没有变化,说明熔点的降低并非是片晶厚度变化所导致.但是AFM的结果却显示螺位错晶体的数量随着Cu2＋含量的提高明显增加.可以认为,在Cu2＋配位受限下的PEO体系中,晶体缺陷应是引起熔点下降的主要原因,和金属等其它晶体材料的情况有着类似效应.

英文摘要：

Segment confinement is constructed by the coordination effect between copper （ Ⅱ ） and poly- （ethylene oxide）. The crystallization and melting behaviors of PEO under segment confinement are studied. Broadband dielectric spectroscopy （BDS） is used to characterize the relaxation behaviors of PEO under confinement. The characteristic relaxation time of/3 and y process of PEO is found to be increased with copper （ Ⅱ） contents,which indicates the cooperative motion of PEO segments and twisting motion of main chain are frustrated. The relaxation time obtained from BDS provides a quantitative evaluation of confinement degree. DSC results show a significant increase of glass transition temperature of PEO with increasing copper （ Ⅱ ） contents and cold crystallization is observed,which indicates the coordination effect of copper（Ⅱ ） has actually restricted the segment motion of PEO. Meanwhile,the crystaIIinity and melting temperature of PEO decrease with the increase of copper（ Ⅱ） contents. WAXD shows that copper（ Ⅱ ） bromide does not crystallize in the blends. No crystal modification of PEO is observed. AFM shows that in all thin films of PEO/CuBr2 blends, PEO forms extended chain crystals （ IF （0）） and the lamella thickness of PEO does not change with copper （ Ⅱ） contents. However, much more screw dislocations are observed as the copper（ Ⅱ ） content increases, which indicates a large number of defects are formed in the PEO crystals. Similar with the situation of metal material, the defects should be responsible for the melting point depression.