对具有良好液晶聚合物微纤结构的聚丙烯/热致液晶聚合物/玻璃纤维(PP/TLCP/GF)混杂复合材料,使用静态拉伸和动态力学分析(DMA)的方法研究了材料的力学性能。拉伸实验结果表明,混杂复合材料的拉伸强度和模量随着PP和TLCP挤出后的牵伸... 对具有良好液晶聚合物微纤结构的聚丙烯/热致液晶聚合物/玻璃纤维(PP/TLCP/GF)混杂复合材料,使用静态拉伸和动态力学分析(DMA)的方法研究了材料的力学性能。拉伸实验结果表明,混杂复合材料的拉伸强度和模量随着PP和TLCP挤出后的牵伸速率增大而上升,并且含有增容剂PP g MAH的体系,力学性能更优异。DMA测试结果表明,混杂复合材料的动态模量E′随着体系中玻纤的含量增加而增大;当体系中加入增容剂后,复合材料的刚性得到进一步提高。但无论是否使用了增容剂PP g MAH,当体系中玻纤含量高于20%后,模量随玻纤含量增大的趋势变缓。当体系中增强相的含量增加,以及加入增容剂使增强相与基体的界面粘结得到改善后,PP基体的损耗因子(tanδ)峰值都有一定的减小。展开更多
Aroylhydrazones,formed by condensation of benzoylhydrazine with benzoylaldehyde,2-methoxybenzoylaldehyde and 2,4-dimethoxybenzoylaldehyde,reacted with TiCl 4 to form their corresponding complexes.The titanium complexe...Aroylhydrazones,formed by condensation of benzoylhydrazine with benzoylaldehyde,2-methoxybenzoylaldehyde and 2,4-dimethoxybenzoylaldehyde,reacted with TiCl 4 to form their corresponding complexes.The titanium complexes were characterized by elementary analysis,IR,and 1H-NMR.Their catalytic properties for ethylene polymerization performed up to 104gPE/(molTi·h).The resultant PE was studied by DSC,GPC,WAXD,FT-IR analyses.The results reveal that the product obtained is a typical linear polyethylene.展开更多
考察了熔融挤出后施加的牵伸比和增容剂对聚丙烯(PP)/热致液晶聚合物(TLCP)原位复合材料中TLCP分散相形貌的影响。结果表明,复合材料中的TLCP相随着牵伸比的增大逐渐形成良好的微纤结构,TLCP微纤的长径比随牵伸比增大而增大;当体系中... 考察了熔融挤出后施加的牵伸比和增容剂对聚丙烯(PP)/热致液晶聚合物(TLCP)原位复合材料中TLCP分散相形貌的影响。结果表明,复合材料中的TLCP相随着牵伸比的增大逐渐形成良好的微纤结构,TLCP微纤的长径比随牵伸比增大而增大;当体系中加入增容剂PP g MAH后,体系中TLCP在较小的牵伸速率下即可形成长径比很大的微纤结构。将上述所得原位复合材料与玻纤在200℃(低于TLCP熔融温度)下熔融挤出制得玻纤和液晶聚合物微纤混杂增强的材料。实验证明,在此加工温度下液晶聚合物形态得到较好保持,注射样品中不存在原位复合材料中典型的"皮 芯"形貌。同时,增容剂PP g MAH还明显改善了玻纤与基体之间的界面粘结。展开更多
A series of bridged ligand 4,4′-methylene-bis [2,6-dialkyl-N-(2-phenylmethylene)-anil] was efficiently synthesized by the condensation reaction of 4,4′-methylene-bis(2,6-disubstituted aniline) and salicyl aldehyde.T...A series of bridged ligand 4,4′-methylene-bis [2,6-dialkyl-N-(2-phenylmethylene)-anil] was efficiently synthesized by the condensation reaction of 4,4′-methylene-bis(2,6-disubstituted aniline) and salicyl aldehyde.They easily coordinated with Ni (Ⅱ) to form the title complexes,which were characterized by IR spectroscopy and elemental analysis.The complexes show good activities for vinyl polymerization of norbornene with methylalumoxane (MAO) as co-catalyst.The variations of complexes and catalytic parameters were investigated along with viscosimetric measurement of resultant polynorbornenes.展开更多
文摘 对具有良好液晶聚合物微纤结构的聚丙烯/热致液晶聚合物/玻璃纤维(PP/TLCP/GF)混杂复合材料,使用静态拉伸和动态力学分析(DMA)的方法研究了材料的力学性能。拉伸实验结果表明,混杂复合材料的拉伸强度和模量随着PP和TLCP挤出后的牵伸速率增大而上升,并且含有增容剂PP g MAH的体系,力学性能更优异。DMA测试结果表明,混杂复合材料的动态模量E′随着体系中玻纤的含量增加而增大;当体系中加入增容剂后,复合材料的刚性得到进一步提高。但无论是否使用了增容剂PP g MAH,当体系中玻纤含量高于20%后,模量随玻纤含量增大的趋势变缓。当体系中增强相的含量增加,以及加入增容剂使增强相与基体的界面粘结得到改善后,PP基体的损耗因子(tanδ)峰值都有一定的减小。
文摘Aroylhydrazones,formed by condensation of benzoylhydrazine with benzoylaldehyde,2-methoxybenzoylaldehyde and 2,4-dimethoxybenzoylaldehyde,reacted with TiCl 4 to form their corresponding complexes.The titanium complexes were characterized by elementary analysis,IR,and 1H-NMR.Their catalytic properties for ethylene polymerization performed up to 104gPE/(molTi·h).The resultant PE was studied by DSC,GPC,WAXD,FT-IR analyses.The results reveal that the product obtained is a typical linear polyethylene.
文摘 考察了熔融挤出后施加的牵伸比和增容剂对聚丙烯(PP)/热致液晶聚合物(TLCP)原位复合材料中TLCP分散相形貌的影响。结果表明,复合材料中的TLCP相随着牵伸比的增大逐渐形成良好的微纤结构,TLCP微纤的长径比随牵伸比增大而增大;当体系中加入增容剂PP g MAH后,体系中TLCP在较小的牵伸速率下即可形成长径比很大的微纤结构。将上述所得原位复合材料与玻纤在200℃(低于TLCP熔融温度)下熔融挤出制得玻纤和液晶聚合物微纤混杂增强的材料。实验证明,在此加工温度下液晶聚合物形态得到较好保持,注射样品中不存在原位复合材料中典型的"皮 芯"形貌。同时,增容剂PP g MAH还明显改善了玻纤与基体之间的界面粘结。
文摘A series of bridged ligand 4,4′-methylene-bis [2,6-dialkyl-N-(2-phenylmethylene)-anil] was efficiently synthesized by the condensation reaction of 4,4′-methylene-bis(2,6-disubstituted aniline) and salicyl aldehyde.They easily coordinated with Ni (Ⅱ) to form the title complexes,which were characterized by IR spectroscopy and elemental analysis.The complexes show good activities for vinyl polymerization of norbornene with methylalumoxane (MAO) as co-catalyst.The variations of complexes and catalytic parameters were investigated along with viscosimetric measurement of resultant polynorbornenes.
