用原子力显微镜AFM等仪器研究了二苯甲酮衍生物侧基聚硅氧烷(PUV S i)的性能和成膜形态。结果表明,PUV S i具有非晶态结构,可形成形态学不均一、表面粗糙的硅膜。聚硅氧烷侧链上的二苯甲酮衍生物基团及其含量可影响PUV S i的性能。当侧...用原子力显微镜AFM等仪器研究了二苯甲酮衍生物侧基聚硅氧烷(PUV S i)的性能和成膜形态。结果表明,PUV S i具有非晶态结构,可形成形态学不均一、表面粗糙的硅膜。聚硅氧烷侧链上的二苯甲酮衍生物基团及其含量可影响PUV S i的性能。当侧基质量分数从31.48%降低至12.87%,PUV S i的摩尔消光系数mξax从3.4564×105下降至1.5763×105,但聚硅氧烷相应的柔软性能增加。展开更多
Dodecyl-benzophenone（DBP） and hexadecoxyl-benzophenone（HDBP） as type 11 photoinitiators used for radical photopolymerization systems were synthesized by Friedel-Crafts reaction, and characterized by 1H NMR and FTI...Dodecyl-benzophenone（DBP） and hexadecoxyl-benzophenone（HDBP） as type 11 photoinitiators used for radical photopolymerization systems were synthesized by Friedel-Crafts reaction, and characterized by 1H NMR and FTIR spectroscopy. The UV-Vis absorption spectra of DBP and HDBP, propitious to photopolymerization under a commercial mercury UV bulb are centered at 345 and 335 nm, respectively. HDBP has higher extinction coefficient than DBP, but lower photoinitiating efficiency. Their photoinitiating performances for EB605, a bisphenol A epoxy acrylate with 40%（mass fraction） tripropyleneglycol diacrylate （TPGDA）, resin consisting of bisphenol A epoxy acrylate and tripropyleneglycol diacrylate in the presence of triethanolamine as a coinitiator were investigated by photo-differential scanning calorimetry（photo-DSC）. DBP initiates the curing of acrylate more efficiently than HDBP, showing higher photopolymerization rate and unsaturation conversion, resulted from the poor compatibility of HDBP with the resin. The photoinitiating activity of DBP to epoxy acrylate resin is even higher than that of BP at lower loadings.展开更多
A benzophenone derivative photoinitiator, HBP-TDI-HQ-TDI-HBP （HTCTH）, was synthesized based on 4-hydroxy benzophenone （HBP）, toluene-2,4-diisocyanate （TDI） and hydroquinone （HQ）. HTCTH was a more effective pho...A benzophenone derivative photoinitiator, HBP-TDI-HQ-TDI-HBP （HTCTH）, was synthesized based on 4-hydroxy benzophenone （HBP）, toluene-2,4-diisocyanate （TDI） and hydroquinone （HQ）. HTCTH was a more effective photoinitiator which had longer wavelength absorption in the UV-vis absorption spectra than the low molecular counterpart benzophenone （BP）. It showed that both rate of polymerization （Rp） and final conversion （P） increased with increase of amine and HTCTH concentration in photopolymerization.展开更多
文摘用原子力显微镜AFM等仪器研究了二苯甲酮衍生物侧基聚硅氧烷(PUV S i)的性能和成膜形态。结果表明,PUV S i具有非晶态结构,可形成形态学不均一、表面粗糙的硅膜。聚硅氧烷侧链上的二苯甲酮衍生物基团及其含量可影响PUV S i的性能。当侧基质量分数从31.48%降低至12.87%,PUV S i的摩尔消光系数mξax从3.4564×105下降至1.5763×105,但聚硅氧烷相应的柔软性能增加。
基金Supported by the National Natural Science Foundation of China(No50973100)
文摘Dodecyl-benzophenone（DBP） and hexadecoxyl-benzophenone（HDBP） as type 11 photoinitiators used for radical photopolymerization systems were synthesized by Friedel-Crafts reaction, and characterized by 1H NMR and FTIR spectroscopy. The UV-Vis absorption spectra of DBP and HDBP, propitious to photopolymerization under a commercial mercury UV bulb are centered at 345 and 335 nm, respectively. HDBP has higher extinction coefficient than DBP, but lower photoinitiating efficiency. Their photoinitiating performances for EB605, a bisphenol A epoxy acrylate with 40%（mass fraction） tripropyleneglycol diacrylate （TPGDA）, resin consisting of bisphenol A epoxy acrylate and tripropyleneglycol diacrylate in the presence of triethanolamine as a coinitiator were investigated by photo-differential scanning calorimetry（photo-DSC）. DBP initiates the curing of acrylate more efficiently than HDBP, showing higher photopolymerization rate and unsaturation conversion, resulted from the poor compatibility of HDBP with the resin. The photoinitiating activity of DBP to epoxy acrylate resin is even higher than that of BP at lower loadings.
基金the National Natural Science Foundation of China(No.50473024)for its financial support.
文摘A benzophenone derivative photoinitiator, HBP-TDI-HQ-TDI-HBP （HTCTH）, was synthesized based on 4-hydroxy benzophenone （HBP）, toluene-2,4-diisocyanate （TDI） and hydroquinone （HQ）. HTCTH was a more effective photoinitiator which had longer wavelength absorption in the UV-vis absorption spectra than the low molecular counterpart benzophenone （BP）. It showed that both rate of polymerization （Rp） and final conversion （P） increased with increase of amine and HTCTH concentration in photopolymerization.
