对二甲胺基二苯酮的吸收光谱行为及其敏化的甲基丙烯酸甲酯的光聚合

本文对对二甲胺基二苯酮的吸收光谱及其光敏引发甲基丙烯酸甲酯聚合反应动力学进行了研究，并简单考察了氧气对聚合反应的影响。     

气相色谱法同时测定乙烯-丙烯酸甲酯共聚物的降解产物丙烯酸甲酯及甲醇

提出了气相色谱法测定乙烯-丙烯酸甲酯(EMA)共聚物降解产物丙烯酸甲酯和甲醇的含量。样品经水浸取,浸取液于气相色谱分析,用火焰离子化检测器测定,外标法定量。丙烯酸甲酯和甲醇的质量浓度分别在0.1~2.0和1.0~20.0 mg.L-1范围内与其峰面积呈线性关系,检出限(3S/N)分别为0.02,0.2 mg.L-1。丙烯酸甲酯和甲醇的回收率分别在96.2%~100.5%和94.6%~97.4%之间,测定结果的相对标准偏差(n=6)均小于6.5%。     

悬浮态乳液聚合

对一种新的聚合方法－－悬浮态乳液聚合的研究进展进行了综述。通过对比悬浮聚合，乳液聚合和悬浮态乳液聚合方法的异同，突出了悬浮态乳液聚合的优点。讨论了悬浮态微液聚合的机理，以及分散剂，表面活性剂，水油比等对聚合物颗粒形态的影响。     

CERIC ION INITIATED GRAFTING ON CELLULOSE FROM BINARY MIXTURE OF ACRYLONITRILE AND METHYLACRYLATE

The Ce(IV)-ion induced grafting on cellulose from the binary mixture of acrylonitrile-methylacrylate has been investigated in heterogeneous and acidic conditions at 25 ± 0. 1°C. Various grafting parameters were evaluated as a function of molarity, feed composition, reaction time, and concentration of ceric ion at constant concentration of nitric acid in the feed. The higher fraction of acrylonitrile in the grafted chains than the feed has indicated the synergistic effect of methylacrylate taken in the feed along with acrylonitrile. IR and elemental analysis for nitrogen contents in the synthesized copolymers were used to determine the composition of the grafted copolymers. The reactivity ratios of acrylonitrile and methylacrylate have been determined by the Mayo and Lewis method and are found to be 1.45 and 0.9, respectively. The grafting parameters have shown increasing trends on varying feed composition (f_AN) from 0.25 to 0.80 and varying monomer concentration from 0. 6 to 5 4 mol dm^?3. The number of grafted moles of synthetic polymer (N_g) on cellulose were found to be dependent on molarity, feed composition, and ceric ion concentration. The experimental results have clearly indicated that maximum fraction of the feed was consumed in the formation of grafted copolymer chains in comparison to the homocopolymers and homopolymers. Estimation of ceric ion disappearance as a function of reaction time has clearly suggested that grafting on cellulose is initiated by the reactive sites generated through hydrogen ion abstraction by single electron transfer process.     

硅胶负载的双高分子-钯催化剂的研究——Ⅰ.硅胶负载的聚[4(2)-乙烯吡啶]-聚[苯乙烯-顺丁烯二酸]-钯催化剂的合成及其催化加氢性能

合成了硅胶负载的聚(4-乙烯吡啶)或聚(2-乙烯吡啶)-聚(苯乙烯-顺丁烯二酸)-钯催化剂(P4VP-PSM-Pd/SiO_2和P2VP-PSM-Pd/SiO_2),研究了合成条件、组成等对其催化性能的影响及对丙烯酸甲酯的催化加氢性能。发现,同时含两种高分子的催化剂比只含一种高分子的催化剂具有较高的催化活性,催化剂在常温常压下对丙烯酸甲酯的氢化反应具有很高的催化活性和选择性,且能重复使用,表现出良好的稳定性。同时还研究了其它因素对催化剂性能的影响。     

New Pd-NHC-complexes for the Mizoroki-Heck reaction

The synthesis and structural characterization of novel chelating N-aryl substituted palladium(II)-biscarbene-complexes is reported: 1,1′-bis(4-bromophenyl)-3,3′-methylene-diimidazoline-2,2′-diylidene-palladium(II)-dibromide, 1,1′-bis(4-methoxyphenyl)-3,3′-methylene-diimidazoline-2,2′-diylidene-palladium(II)-dibromide and 1,1′-bis(4-n-butoxyphenyl)-3,3′-methylenediimidazoline-2,2′-diylidene-palladium(II)-dibromide have been synthesized in good yields. The catalytic activity of these 1,1′-aryl-3,3′-methylenediimidazoline-2,2′-diylidene-palladium(II)-dihalogenide complexes was tested for the Mizoroki-Heck reaction in comparison to 1,1′-(bis)methyl-3,3′-methylenediimidazoline-2,2′-diylidene-palladium(II)-dihalogenide complexes and to 1,1′-bis(phenyl)-3,3′-methylene-diimidazoline-2,2′-diylidene-palladium(II)-dibromide. The activity of the aryl substituted catalysts is significantly higher compared to the methyl substituted NHC complexes. They also allow the coupling of arylchlorides with olefins.