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Self-polymerization and co-polymerization kinetics of lead methacrylate

Rare Metals 2021年第3期40卷 736-742页

作者： Yu-Juan Zhang Xin-Tao Guo Chun-Hong Wang De-Feng Wu Ming Zhang School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China Department of Materials Research AVIC Manufacturing Technology InstituteBeijing 100024China

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 *** 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),*** 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 *** results show that the polymerization rate(R_(p)) is expressed as Rp=K[M]^(1.02)[I]^(0.37) below the 10% conversion rate at 70℃,where K is the polymerization rate *** in the N,N-dimethylformamide(DMF) solution,the activation energy required for Pb(MAA)_(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 *** 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.

关键词： Lead methacrylate polymerization kinetic Reactivity ratio Plexiglass

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polymerization of Methyl Acrylate with Nd-Al-α,α'-Dipyridyl Catalyst System

引用

Journal of Rare Earths 2001年第4期19卷 308-310页

作者：房江华章哲彦黄峥峥 Ningbo Univ Dept Chem Ningbo 315020 Peoples R China

The polymerization of methyl acrylate (MA) with Nd(naph) 3 Al( i Bu) 3 α,α′ dipyridyl catalyst was studied. The molecular weight and its distribution were determined by gel penetration chromatography. kinetic studies show that the MA polymerization rate is the first order with respect to monomer concentration. The apparent activation energy of MA polymerization is 49 34 kJ·mol -1 .

关键词： rare earths coordination catalysts methyl acrylate polymerization kinetic polymerization

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