Carboxylic ended aliphatic aromatic hyperbranched poly(5 hydroxyethoxyisophthalic acid)(PHEIA) was employed for an electrostatic layer by layer self assembly procedure. The self assembly films have been successfully f...Carboxylic ended aliphatic aromatic hyperbranched poly(5 hydroxyethoxyisophthalic acid)(PHEIA) was employed for an electrostatic layer by layer self assembly procedure. The self assembly films have been successfully formed from both aqueous solution and water THF mixture. The self assembly procedure was monitored by UV Vis spectroscopy and contact angle measurement meter. The obtained multilayers were characterized by AFM for the surface morphology investigation. The results indicate that PHEIA is able to form self assembly film in the presence of poly(diallyldimethylammonium chloride) (PDAC). On the self assembled surface where PHEIA acted as an outmost layer, the PHEIA aggregated into sphere like particles with uniform diameter. Furthermore, the layer by layer self assembly procedure provided a favorable method for modification of the hydrophilicity of the substrate without heavy interpenetration between these two polyelectrolyte layers.展开更多
A new process was designed to modify the hydroxy capped aliphatic hyperbranched polyester, derived from 2,2 bis(methylol) propionic acid and trimethylopropane in which the crude polyester reacted directly with maleic ...A new process was designed to modify the hydroxy capped aliphatic hyperbranched polyester, derived from 2,2 bis(methylol) propionic acid and trimethylopropane in which the crude polyester reacted directly with maleic anhydride in bulk to transfer the hydroxy end groups to 4 carboxy 2 butante end groups. The modified polyester was characterized by IR, 1H NMR, DSC and viscosity measurement. The results indicated that no side reaction took place during the modifying step and the conversion for the reaction was calculated to be 88.9% based on the \+1H NMR spectra. The T g value shifted from 320 3 K for the crude polymer to 288 4 K for the modified polymer. Moreover, the UV curing coating of the midified polyester showed high performances in hardness, adhensive and water resistance. [WT5HZ]展开更多
采用差示扫描量热法(DSC)和衰减全反射傅里叶变换红外光谱(ATR-FTIR)研究了不同代数和含量的端苯基超支化聚酯(HBP)对聚对苯二甲酸乙二醇酯(PET)结晶行为和构象的影响,计算了晶带与内标峰的吸光度比值以及左右式构象的相对含量。其中975...采用差示扫描量热法(DSC)和衰减全反射傅里叶变换红外光谱(ATR-FTIR)研究了不同代数和含量的端苯基超支化聚酯(HBP)对聚对苯二甲酸乙二醇酯(PET)结晶行为和构象的影响,计算了晶带与内标峰的吸光度比值以及左右式构象的相对含量。其中975 cm 1和1340 cm 1处的吸收峰归属于反式构象,1370 cm 1处归属于左右式构象,793 cm 1和873 cm 1处的吸收峰为内标峰。结果表明,6%的第三代超支化聚酯对PET的结晶促进能力最强。随着超支化聚酯含量或代数的增加,各吸光度比值基本上都呈现出先增大后减小的趋势,左右式构象的含量则表现出先减小后增大的趋势。端苯基超支化聚酯既可以充当成核剂,又可以充当结晶促进剂,因而可以促进PET结晶。展开更多
文摘Carboxylic ended aliphatic aromatic hyperbranched poly(5 hydroxyethoxyisophthalic acid)(PHEIA) was employed for an electrostatic layer by layer self assembly procedure. The self assembly films have been successfully formed from both aqueous solution and water THF mixture. The self assembly procedure was monitored by UV Vis spectroscopy and contact angle measurement meter. The obtained multilayers were characterized by AFM for the surface morphology investigation. The results indicate that PHEIA is able to form self assembly film in the presence of poly(diallyldimethylammonium chloride) (PDAC). On the self assembled surface where PHEIA acted as an outmost layer, the PHEIA aggregated into sphere like particles with uniform diameter. Furthermore, the layer by layer self assembly procedure provided a favorable method for modification of the hydrophilicity of the substrate without heavy interpenetration between these two polyelectrolyte layers.
文摘A new process was designed to modify the hydroxy capped aliphatic hyperbranched polyester, derived from 2,2 bis(methylol) propionic acid and trimethylopropane in which the crude polyester reacted directly with maleic anhydride in bulk to transfer the hydroxy end groups to 4 carboxy 2 butante end groups. The modified polyester was characterized by IR, 1H NMR, DSC and viscosity measurement. The results indicated that no side reaction took place during the modifying step and the conversion for the reaction was calculated to be 88.9% based on the \+1H NMR spectra. The T g value shifted from 320 3 K for the crude polymer to 288 4 K for the modified polymer. Moreover, the UV curing coating of the midified polyester showed high performances in hardness, adhensive and water resistance. [WT5HZ]
文摘采用差示扫描量热法(DSC)和衰减全反射傅里叶变换红外光谱(ATR-FTIR)研究了不同代数和含量的端苯基超支化聚酯(HBP)对聚对苯二甲酸乙二醇酯(PET)结晶行为和构象的影响,计算了晶带与内标峰的吸光度比值以及左右式构象的相对含量。其中975 cm 1和1340 cm 1处的吸收峰归属于反式构象,1370 cm 1处归属于左右式构象,793 cm 1和873 cm 1处的吸收峰为内标峰。结果表明,6%的第三代超支化聚酯对PET的结晶促进能力最强。随着超支化聚酯含量或代数的增加,各吸光度比值基本上都呈现出先增大后减小的趋势,左右式构象的含量则表现出先减小后增大的趋势。端苯基超支化聚酯既可以充当成核剂,又可以充当结晶促进剂,因而可以促进PET结晶。
