Photopolymerization of propargyl acetate (PAT) with Michler's ketone (MK) asphotoinitiator in benzene has been investigated for the first time. Some features of the PATphotopolymerization with MK as photoinitiator...Photopolymerization of propargyl acetate (PAT) with Michler's ketone (MK) asphotoinitiator in benzene has been investigated for the first time. Some features of the PATphotopolymerization with MK as photoinitiator is described.展开更多
Bis (7- diethylaminocoumarin) ketone- 3(DACK) and diphenyliodonium salt (DPIO)combination as an effective photoinitiation system for radical polymerization has been investigated. The sensitized photolysis of DACK/DPIO...Bis (7- diethylaminocoumarin) ketone- 3(DACK) and diphenyliodonium salt (DPIO)combination as an effective photoinitiation system for radical polymerization has been investigated. The sensitized photolysis of DACK/DPIO leads to bleaching of DACK and decomposition of DPIO to generate initiating radical species. The electron transfer sensitization occurs mainly from the triplet state of DACK. The photobleaching obeyed a second-order kinetics and the rate constant was evaluated to be 31.3mol^(-1)·1·s^(-1) Photopolymerization of MMA initiated by DACK/DPIO was carried out in acetonitrile solution. The polymerization rate was found to be proportional to the concentration of DACK, DPIO and MMA with the exponents of 0.34, 0.40 and 1.0 respectively. The initiated efficiency is comparable to those of small molecular ketones.The sensitized photoinitiation mechanism has been discussed.展开更多
Photoinitiator α hydroxy α methylpropiophenone was synthesized using CCl 4 and α methylpropiophenon which was prepared from isobutyryl chloride and benzene.Some factors on the yield of PHMP were discussed.
以4,4’-二甲基二苯甲酮为原料,经过溴化、选择性胺化、O-烷基化等反应,依次合成了4-(溴甲基)-4’-[双(羟乙基)氨基]二苯甲酮与4-(腰果酚基甲基)-4’-[双(羟乙基)氨基]二苯甲酮两个功能性的类米氏酮光引发剂,收率分别为58%和46%。在4-(...以4,4’-二甲基二苯甲酮为原料,经过溴化、选择性胺化、O-烷基化等反应,依次合成了4-(溴甲基)-4’-[双(羟乙基)氨基]二苯甲酮与4-(腰果酚基甲基)-4’-[双(羟乙基)氨基]二苯甲酮两个功能性的类米氏酮光引发剂,收率分别为58%和46%。在4-(溴甲基)-4’-[双(羟乙基)氨基]二苯甲酮中含有苄溴基团,因此该化合物还可作为ATRP或SET-LRP引发剂。同时,利用4-(溴甲基)-4’-[双(羟乙基)氨基]二苯甲酮作引发剂进行了腰果酚单体的AGET ATRP聚合反应,得到相应的腰果酚均聚物(Mn=20.2 k Da,PDI=1.11)。小分子化合物的结构用1H-NMR进行了表征。展开更多
文摘Photopolymerization of propargyl acetate (PAT) with Michler's ketone (MK) asphotoinitiator in benzene has been investigated for the first time. Some features of the PATphotopolymerization with MK as photoinitiator is described.
文摘Bis (7- diethylaminocoumarin) ketone- 3(DACK) and diphenyliodonium salt (DPIO)combination as an effective photoinitiation system for radical polymerization has been investigated. The sensitized photolysis of DACK/DPIO leads to bleaching of DACK and decomposition of DPIO to generate initiating radical species. The electron transfer sensitization occurs mainly from the triplet state of DACK. The photobleaching obeyed a second-order kinetics and the rate constant was evaluated to be 31.3mol^(-1)·1·s^(-1) Photopolymerization of MMA initiated by DACK/DPIO was carried out in acetonitrile solution. The polymerization rate was found to be proportional to the concentration of DACK, DPIO and MMA with the exponents of 0.34, 0.40 and 1.0 respectively. The initiated efficiency is comparable to those of small molecular ketones.The sensitized photoinitiation mechanism has been discussed.
文摘Photoinitiator α hydroxy α methylpropiophenone was synthesized using CCl 4 and α methylpropiophenon which was prepared from isobutyryl chloride and benzene.Some factors on the yield of PHMP were discussed.
文摘以4,4’-二甲基二苯甲酮为原料,经过溴化、选择性胺化、O-烷基化等反应,依次合成了4-(溴甲基)-4’-[双(羟乙基)氨基]二苯甲酮与4-(腰果酚基甲基)-4’-[双(羟乙基)氨基]二苯甲酮两个功能性的类米氏酮光引发剂,收率分别为58%和46%。在4-(溴甲基)-4’-[双(羟乙基)氨基]二苯甲酮中含有苄溴基团,因此该化合物还可作为ATRP或SET-LRP引发剂。同时,利用4-(溴甲基)-4’-[双(羟乙基)氨基]二苯甲酮作引发剂进行了腰果酚单体的AGET ATRP聚合反应,得到相应的腰果酚均聚物(Mn=20.2 k Da,PDI=1.11)。小分子化合物的结构用1H-NMR进行了表征。
