Enantioselective alternating copolymerization of carbon monoxide with propylene was carried out using palladium catalyst modified by 1,4-3,6-dianhydro-2,5-dideoxy-2,5-bis (diphenylphosphino)-L-iditol (DDPPI). The chir...Enantioselective alternating copolymerization of carbon monoxide with propylene was carried out using palladium catalyst modified by 1,4-3,6-dianhydro-2,5-dideoxy-2,5-bis (diphenylphosphino)-L-iditol (DDPPI). The chiral diphosphine was proved to be effective at enantioselective copolymerization. Optical rotation, elemental analysis, H-1, C-13-NMR and IR spectra showed that the copolymer was optically active, isotactic, alternating poly(1,4-ketone) structure.展开更多
用在 5 0 L固相接枝反应器中合成的马来酸酐接枝聚丙烯 ( i PP g MAH)作界面改性剂 ,制备了马来酸酐接枝聚丙烯 /聚丙烯 /硫酸钙晶须 ( i PP g MAH/i PP/Ca SO4 )复合材料 .研究了 i PP g MAH/i PP/Ca SO4 复合材料的形态结构和力学性...用在 5 0 L固相接枝反应器中合成的马来酸酐接枝聚丙烯 ( i PP g MAH)作界面改性剂 ,制备了马来酸酐接枝聚丙烯 /聚丙烯 /硫酸钙晶须 ( i PP g MAH/i PP/Ca SO4 )复合材料 .研究了 i PP g MAH/i PP/Ca SO4 复合材料的形态结构和力学性能 .结果表明 :i PP g MAH对 i PP/Ca SO4 复合物的缺口抗冲强度、弯曲强度和拉伸强度均有增强作用 ;i PP g MAH对硫酸钙晶须填充的 i PP/Ca SO4 复合物表观粘度几乎没有影响 .SEM观察发现 i PP g MAH对硫酸钙晶须填充的 i PP/Ca SO4展开更多
用在 5 0L固相接枝反应器中合成的马来酸酐接枝聚丙烯 (PP g MAH )作界面改性剂 ,制备了马来酸酐接枝聚丙烯 /聚丙烯 /碳酸钙 (i PP/PP g MAH/CaCO3 )复合材料。研究了i PP/PP g MAH/CaCO3 复合材料的力学性能和增容机理。结果表明 ,PP ...用在 5 0L固相接枝反应器中合成的马来酸酐接枝聚丙烯 (PP g MAH )作界面改性剂 ,制备了马来酸酐接枝聚丙烯 /聚丙烯 /碳酸钙 (i PP/PP g MAH/CaCO3 )复合材料。研究了i PP/PP g MAH/CaCO3 复合材料的力学性能和增容机理。结果表明 ,PP g MAH对i PP/CaCO3 复合物的缺口冲击强度、弯曲强度和拉伸强度均有提高 ;PP g MAH与CaCO3 反应形成PP g MAH的钙盐 ,实现反应性增容。展开更多
Enantioselective alternating copolymerization of carbon monoxide with ω undecylenic acid was carried out using cationic palladium catalyst modified by 1,4 3,6 dianhydro 2,5 dideoxy 2,5 bis(diphenylphosphino) L iditol...Enantioselective alternating copolymerization of carbon monoxide with ω undecylenic acid was carried out using cationic palladium catalyst modified by 1,4 3,6 dianhydro 2,5 dideoxy 2,5 bis(diphenylphosphino) L iditol (DDPPI). The chiral diphosphine was proved to be effective in the enantioselective copolymerization. The pure poly(1,4 ketone) was obtained by dissolving the copolymer containing spiroketal and 1,4 ketone units in 1,1,1,3,3,3 hexafluoro 2 propanol and reprecipitating with methanol. Optical rotation, elemental analysis, spectra of 1H, 13 C NMR and IR showed that our copolymer was an optically active, isotatic, alternating poly(1,4 ketone) structure. The copolymerization was carried out at 45 ℃ for 20 h. Molecular weight: n=1.1× 10 4 versus polystyrene, w/ n=1.84. Molar optical rotation: 20 589 =+43°(CH 3COOC 2H 5, 5.0 mg/mL). The productivity of the copolymer of ω undecylenic acid with carbon monoxide was 40.6 g copolymer/(g Pd·h).展开更多
Enantioselective alternating copolymerization of carbon monoxide with 1 heptene was carried out using palladium catalyst modified by 1,4 3,6 dianhydro 2,5 dideoxy 2,5 bis(diphenylphosphino) L iditol (DDPPI). The chira...Enantioselective alternating copolymerization of carbon monoxide with 1 heptene was carried out using palladium catalyst modified by 1,4 3,6 dianhydro 2,5 dideoxy 2,5 bis(diphenylphosphino) L iditol (DDPPI). The chiral diphosphine was proved to be effective at enantioselective copolymerization. The pure poly(1,4 ketone) was obtained by dissolving the copolymer containing spiroketal and 1,4 ketone units in 1,1,1,3,3,3 hexafluoro 2 propanol and reprecipitating with methanol. Optical rotation, elemental analysis, spectra of 1H\|NMR, 13 C NMR and IR showed that our copolymer was optically active, isotatic, alternating poly(1,4 ketone) structure. The copolymerization was carried out at 45℃ for 48?h. Molecular weight: M n=4 02×10 3, M w/ M n=1 55 (GPC measurements with polystyrene standards). Optical rotation:[ α ] 20 589 =+63° (CH 2Cl 2, 5 0?mg/mL). T m=194℃, T g=11℃.展开更多
基金the National Natural Science Foundation of China for financial support (No. 29933050).
文摘Enantioselective alternating copolymerization of carbon monoxide with propylene was carried out using palladium catalyst modified by 1,4-3,6-dianhydro-2,5-dideoxy-2,5-bis (diphenylphosphino)-L-iditol (DDPPI). The chiral diphosphine was proved to be effective at enantioselective copolymerization. Optical rotation, elemental analysis, H-1, C-13-NMR and IR spectra showed that the copolymer was optically active, isotactic, alternating poly(1,4-ketone) structure.
文摘用在 5 0 L固相接枝反应器中合成的马来酸酐接枝聚丙烯 ( i PP g MAH)作界面改性剂 ,制备了马来酸酐接枝聚丙烯 /聚丙烯 /硫酸钙晶须 ( i PP g MAH/i PP/Ca SO4 )复合材料 .研究了 i PP g MAH/i PP/Ca SO4 复合材料的形态结构和力学性能 .结果表明 :i PP g MAH对 i PP/Ca SO4 复合物的缺口抗冲强度、弯曲强度和拉伸强度均有增强作用 ;i PP g MAH对硫酸钙晶须填充的 i PP/Ca SO4 复合物表观粘度几乎没有影响 .SEM观察发现 i PP g MAH对硫酸钙晶须填充的 i PP/Ca SO4
文摘用在 5 0L固相接枝反应器中合成的马来酸酐接枝聚丙烯 (PP g MAH )作界面改性剂 ,制备了马来酸酐接枝聚丙烯 /聚丙烯 /碳酸钙 (i PP/PP g MAH/CaCO3 )复合材料。研究了i PP/PP g MAH/CaCO3 复合材料的力学性能和增容机理。结果表明 ,PP g MAH对i PP/CaCO3 复合物的缺口冲击强度、弯曲强度和拉伸强度均有提高 ;PP g MAH与CaCO3 反应形成PP g MAH的钙盐 ,实现反应性增容。
文摘Enantioselective alternating copolymerization of carbon monoxide with ω undecylenic acid was carried out using cationic palladium catalyst modified by 1,4 3,6 dianhydro 2,5 dideoxy 2,5 bis(diphenylphosphino) L iditol (DDPPI). The chiral diphosphine was proved to be effective in the enantioselective copolymerization. The pure poly(1,4 ketone) was obtained by dissolving the copolymer containing spiroketal and 1,4 ketone units in 1,1,1,3,3,3 hexafluoro 2 propanol and reprecipitating with methanol. Optical rotation, elemental analysis, spectra of 1H, 13 C NMR and IR showed that our copolymer was an optically active, isotatic, alternating poly(1,4 ketone) structure. The copolymerization was carried out at 45 ℃ for 20 h. Molecular weight: n=1.1× 10 4 versus polystyrene, w/ n=1.84. Molar optical rotation: 20 589 =+43°(CH 3COOC 2H 5, 5.0 mg/mL). The productivity of the copolymer of ω undecylenic acid with carbon monoxide was 40.6 g copolymer/(g Pd·h).
文摘Enantioselective alternating copolymerization of carbon monoxide with 1 heptene was carried out using palladium catalyst modified by 1,4 3,6 dianhydro 2,5 dideoxy 2,5 bis(diphenylphosphino) L iditol (DDPPI). The chiral diphosphine was proved to be effective at enantioselective copolymerization. The pure poly(1,4 ketone) was obtained by dissolving the copolymer containing spiroketal and 1,4 ketone units in 1,1,1,3,3,3 hexafluoro 2 propanol and reprecipitating with methanol. Optical rotation, elemental analysis, spectra of 1H\|NMR, 13 C NMR and IR showed that our copolymer was optically active, isotatic, alternating poly(1,4 ketone) structure. The copolymerization was carried out at 45℃ for 48?h. Molecular weight: M n=4 02×10 3, M w/ M n=1 55 (GPC measurements with polystyrene standards). Optical rotation:[ α ] 20 589 =+63° (CH 2Cl 2, 5 0?mg/mL). T m=194℃, T g=11℃.
