《Table 2 Characterization of as-synthesized PMMA-b-PS initiated by PMMA-1 and PMMA-3 at different ti

《Table 2 Characterization of as-synthesized PMMA-b-PS initiated by PMMA-1 and PMMA-3 at different ti   提示：宽带有限、当前游客访问压缩模式
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《Effect of Halogen Chain End Fidelity on the Synthesis of Poly(methyl methacrylate-b-styrene) by ATRP》


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a[PMMA-1]/[CuCl]/[PMDETA]/[St]=1/1/2/200；b[PMMA-3]/[CuBr]/[PMDETA]/[St]=1/1/2/200；c Mass fractions were caculated by 1H-NMR analysis；d Conv.=（m AS-x-m PMMA）/m AS-x×100%；e Measured by GPC using THF as eluent based on PS standards.All reactions were carri

The fidelity of halogen chain ends can be estimated by characterization of the fractions.The weight percentages of fractions 1-3 were~1.8 wt%-1.9 wt%for AS-3，while the weight percentages of fractions 1-3 were 2.2 wt%，7.0 wt%and 16.7 wt%，respectively，for AS-6 under the same fractionation conditions（Table 3）.The Mn and PDIs of fraction 1 from AS-3（and AS-6）were 55 kg/mol（and47 kg/mol）and 1.28（1.38）（Table 3） .Such narrow PDI suggested that PS was not from thermal polymerization of St monomers.ICP-MS analysis showed that there was 0.7 Cl per chain and 0.6 Br per chain，respectively，indicating that chain transfer to St monomers happened to form PS homopolymers（Table 3）.But chain transfer to St monomer was not significant since the weight percentage of fraction1 was~2%in both block copolymers.

图表编号XD0020172200    严禁用于非法目的
绘制时间2018.11.01
作者Guang-Cheng Huang、Sheng-Xiang Ji
绘制单位Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences、University of Chinese Academy of Sciences、Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sc
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