梳状热塑性聚氨酯基固态聚合物电解质的制备与性能

以三羟甲基丙烷聚乙二醇单甲醚(Ymer-N120)、聚对苯二甲酸-3-甲基-1,5-戊二醇酯二醇(TPA-1000)、异佛尔酮二异氰酸酯和1,4-丁二醇合成了系列具有梳状结构的热塑性聚氨酯弹性体(TPU),再在TPU中加入锂盐得到系列固态聚合物电解质(SPEs);研究了TPA-1000和Ymer-N120加入量对固态聚合物电解质性能的影响。结果表明,制备的SPEs离子电导率与温度的关系符合Arrhenius方程,随着Ymer-N120含量的增加,SPEs的玻璃化转变温度降低,拉伸强度减小,其中以质量比m(TPA-1000)∶m(Ymer-N120)=1∶2制备的固态聚合物电解质(SPE4)综合性能最佳,拉伸强度为0.88 MPa、80℃时离子电导率为1.07×10^(-4) S/cm,以SPE4组装的LiFePO_4/SPE4/Li全固态电池在80℃、0.2 C下的放电比容量为138 mA·h/g。

Hemichorea in nonketotic hyperglycemia: Putamenal and cerebellum lesion on MR imaging

Hemichorea with corresponding putamenal T1 hyper-intensity and T2 hypointensity on MR imaging has occasionally been reported in diabetes mellitus with nonketotic hyperglycemia. However, the signal intensity in pu-tamenal and cerebellum lesion on MR imaging, which is believed to be pathogenetically related to hemichorea, is rarely documented in diabetes mellitus with nonketotic hyperglycemia. We describe a 57-year-old man with nonketotic hyperglycemic hemichorea on his right arm and legs, whose signal intensity in putamenal and cerebellum lesion was demonstrated by MR imaging.

静电纺丝制备锂离子电池用聚氨酯/有机硅复合隔膜

以聚氨酯与有机硅为原料,采用高压静电纺丝法制备了系列聚氨酯/有机硅复合纤维隔膜,通过傅里叶变换红外光谱及扫描电子显微镜等表征了纤维膜的结构、形貌与力学性能。结果表明,当有机硅加入量为10%时,纤维膜的拉伸强度达到10. 1 MPa,孔隙率为60. 9%,吸液率高达428. 7%,25℃离子电导率达到最佳值4. 5×10-3S/cm。以该隔膜组装成Li Fe PO4/Li电池测试,电流密度为0. 2 C时首次放电容量为152. 8 m A·h/g,1 C循环100次放电容量依旧能保持在135. 2m A·h/g,容量保持率为99. 2%,显示出较好的循环稳定性。