| From perspective of academic and industry,photopolymerization technology has become an important field in polymer science,in today's word,people pay more attention to environmentally friendly,green,safe,sustainable and cost,etc,making the photopolymerization technology get unprecedented development.Compared to traditional solvent and thermal curing products,photopolymerization products don't need solvent,so no VOC release,but adding reactive diluent adjust the viscosity of photopolymerization formulation to make construct conveniently,in addition to,it can also improve photopolymerization rate and products properties,are green environment products.As the rapidly development of photopolymerization technology and the widely use of photopolymerization products,a new requirements for raw materials have been put,so,exploiting acrylate monomer with simple manufacturing process and excellent performance is imperative.In present study,three new acrylic ester monomers were prepared via half ester strategies and Michael addition reaction,and the UV-curing performance and properties of cured materials were studied.1.A half ester(AEOEA)was prepared by hydroxyl ethyl acrylate(HEA)and maleic anhydride(MA)via ring opening reaction.Then glycidyl ester of acrylic(GMA)was reacted with AEOEA obtained a three functional highly active acrylic ester monomer(AEHMPM)via a ring-opening reaction.The kinetics of photopolymerization performance of AEHMPM was investigated via real-time infrared spectrum(RT-IR).The results indicated that the degree of polymerization was different with different initiators,and the best initiator formula was 907 combined with ITX triggering the highest polymerization degree.As the increasing of the concentration of initiator 1173 and light intensity,the polymerization rate and double bond conversion of the monomer was increased.Compared with a commercialized three functional monomer TMPTA,the reactivity of AEHMPM was higher than TMPTA.The mechanical properties of cured materials were detected by dynamic mechanical analyzer(DMA).The results showed that the cured materials of the monomer with a high glass transition temperature,energy storage modulus and crosslinking density.2.Hydroxyl ethyl methacrylate(HEMA),maleic anhydride(MA)and methyl glycidyl ester of acrylic(GMA)were used to synthesis a new three functional monomer(HMPMA)by continue using the half ester strategies.And the photopolymerization kinetics performance of HMPMA contented dental restoration resin system indicated that the Bis-GMA/HMPMA system with a comparative double bond conversion compared with Bis-GMA/TEGDMA system,but with a relative high polymerization rate.Dynamic mechanical analyzer(DMA)results proved that the cured materials of Bis-GMA/HMPMA showed up the excellent physical and mechanical properties.Furthermore,the properties of volume shrinkage,water absorption,solubility and cell toxicity.etc.of the cured materials were also investigated.It demonstrated that the monomer HMPMA could be well used in dental restoration resin.3.A polymerizable amine co-initiator(HMPMO)with high molecular weight was synthesized via Michael addition reaction based on the reactive diluent HMPMA that used in dental restoration resin.The photo-polymerization performance of HMPMO contented dental restoration resin system indicated that the polymerization rate and double conversion rate was increased as the increasing of the concentration of HMPMO gradually.The results of Dynamic mechanical analysis,absorbent,solubility,volume shrinkage and cytotoxicity test demonstrated that the cured materials with HMPMO initiator system was satisfied with the requirement of dental restorative materials despite the double bond conversion rate lower than the EDAB initiator system. |
PDF Full Text Request