Self-polymerization and co-polymerization kinetics of lead methacrylate
来源期刊：Rare Metals2021年第3期
论文作者：Yu-Juan Zhang Xin-Tao Guo Chun-Hong Wang De-Feng Wu Ming Zhang
文章页码：736 - 742
摘 要：Hydrogen nuclear magnetic resonance（H1-NMR） and X-ray diffractometer（XRD） were used to characterize the molecular and crystal structure of lead methacrylate [Pb（MAA）2] which was produced by the double decomposition reaction of lead oxide and methacrylic acid.Isothermal analysis and Kelen-T（u|"）dos（K-T） method were used to study the self-polymerization kinetic and the monomer reactivity ratios of Pb（M A A）2 and methyl methacrylate（MMA）,respectively.By the ternary polymerization method of bulk casting using MMA,Pb（MAA）2 and gadolinium methacrylate（Gd（MAA）3） as monomers,we prepared the plexiglass which have neutron and X-ray protection property.The results show that the polymerization rate（Rp） is expressed as Rp=K[M]1.02[I]0.37 below the 10% conversion rate at 70℃,where K is the polymerization rate constant.And in the N,N-dimethylformamide（DMF） solution,the activation energy required for Pb（M A A） 2 to initiate self-polymerization by the free radicals is 74.99 kJ·mol-1.The reactivity ratios of r1 [Pb（MAA）2] and r2（MMA） are 3.767 and0.166.As the thickness of the material increases,the X-ray and thermal neutron shielding ability of the plexiglass containing gadolinium and lead is getting better and better.
Yu-Juan Zhang1，Xin-Tao Guo2，Chun-Hong Wang1，De-Feng Wu1，Ming Zhang1
1. School of Chemistry and Chemical Engineering,Yangzhou University2. Department of Materials Research,AVIC Manufacturing Technology Institute
摘 要：Hydrogen nuclear magnetic resonance（H1-NMR） and X-ray diffractometer（XRD） were used to characterize the molecular and crystal structure of lead methacrylate [Pb（MAA）2] which was produced by the double decomposition reaction of lead oxide and methacrylic acid.Isothermal analysis and Kelen-T（u|"）dos（K-T） method were used to study the self-polymerization kinetic and the monomer reactivity ratios of Pb（M A A）2 and methyl methacrylate（MMA）,respectively.By the ternary polymerization method of bulk casting using MMA,Pb（MAA）2 and gadolinium methacrylate（Gd（MAA）3） as monomers,we prepared the plexiglass which have neutron and X-ray protection property.The results show that the polymerization rate（Rp） is expressed as Rp=K[M]1.02[I]0.37 below the 10% conversion rate at 70℃,where K is the polymerization rate constant.And in the N,N-dimethylformamide（DMF） solution,the activation energy required for Pb（M A A） 2 to initiate self-polymerization by the free radicals is 74.99 kJ·mol-1.The reactivity ratios of r1 [Pb（MAA）2] and r2（MMA） are 3.767 and0.166.As the thickness of the material increases,the X-ray and thermal neutron shielding ability of the plexiglass containing gadolinium and lead is getting better and better.
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