Branched polymers through redox emulsion polymerization using peroxide monomer as the branching agent
Branched polymers through redox emulsion polymerization using peroxide monomer as the branching agent
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使用过氧化物单体作为支化剂通过氧化还原乳液聚合形成支化聚合物
DOI：
10.1002/pol.20200636
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发表时间：
2021-03
影响因子：
3.4
通讯作者：
Bibiao Jiang
中科院分区：
文献类型：
--
作者：
Qilin Jiang;Yuanliang Zhang;Qimin Jiang;Yongzhuang Du;Li Jiang;Wenyan Huang;Xiaoqiang Xue;Hongjun Yang;Bibiao Jiang
本文报道了在2‐（叔丁基过氧）甲基丙烯酸乙酯（BPEMA）、硫酸亚铁和甲醛亚砜酸钠（SFS）存在下，乳液氧化还原聚合制支链乙烯基聚合物。过氧化烷基单体BPEMA在制备和储存过程中具有较高的稳定性。核磁共振波谱（NMR）、拉曼光谱（Raman）和三检测尺寸-排除色谱（TD - SEC）测量被用来揭示聚合过程并提供分支结构的证据。在St100‐BPEMA1.0‐FeSO4 0.5‐SFS0.2的聚合条件下，单体转化率在75%以下和75%以上时，分子量分别增加和减少。单体转化过程中分子量的降低是由于胶束粘度的增加，使得形成的含乙烯基的大分子难以参与聚合。最后，分子量达到mn。SEC= 439,200 g/mol，转化率为92.2%。此外，在转化率低于60%和高于60%时，Zimm分支因子g′也分别减小和增大，最终趋于0.41，显示出较高的分支程度。支化聚（甲基丙烯酸甲酯）也是通过这种策略制备的，显示了支化乙烯基聚合物的通用方法。
Redox emulsion polymerization to branched vinyl polymers in the presence of 2‐(tert‐butylperoxy)ethyl methacrylate (BPEMA), ferrous sulfate, and sodium formaldehyde sulfoxylate (SFS) is reported in this paper. The peroxide monomer BPEMA containing alkyl peroxide was designed for high stability during preparation and storage. Nuclear magnetic resonance spectroscopy (NMR), Raman, and triple‐detection size‐exclusion chromatography (TD‐SEC) measurements were used to reveal the polymerization procedure and provide evidence of branching structure. In the case of polymerization at St100‐BPEMA1.0‐FeSO4 0.5‐SFS0.2, the molecular weight increased and decreased with conversion below and above 75% monomer conversion, respectively. The decreasing of molecular weight with monomer conversion came from the increased viscosity of the micelle, which makes it difficult for the formed macromolecules containing vinyl group to participate into polymerization. Finally, the molecular weight reached a value ofMn. SEC= 439,200 g/mol at 92.2% conversion. In addition, the Zimm branching factor,g', also decreased and increased with conversion below and above 60% conversion, respectively, and then theg' finally attends a value of 0.41, showing high degree of branching. Branched poly(methyl methacrylate) was also prepared through this strategy, showing a versatile approach to branched vinyl polymers.
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影响因子：
5.5
作者：
V. Samaryk;I. Tarnavchyk;A. Voronov;S. Varvarenko;N. Nosova;A. Kohut;S. Voronov
通讯作者：
V. Samaryk;I. Tarnavchyk;A. Voronov;S. Varvarenko;N. Nosova;A. Kohut;S. Voronov
通过自由基水溶液聚合轻松合成低粘度和高热稳定性的高度支化的丙烯腈-醋酸乙烯酯共聚物
影响因子：
4.6
作者：
Zhang, Dongliang;Kong, Lizhi;Zhang, Yan;Komarneni, Sridhar
通讯作者：
Komarneni, Sridhar
影响因子：
5.5
作者：
Yuanqin Liu;W. Schroeder;Jeffrey C. Haley;W. Lau;M. Winnik
通讯作者：
Yuanqin Liu;W. Schroeder;Jeffrey C. Haley;W. Lau;M. Winnik
影响因子：
56.9
作者：
FRECHET, JMJ;HENMI, M;GRUBBS, RB
通讯作者：
GRUBBS, RB
DOI：
10.1002/pola.29334
发表时间：
2019-04
期刊：
Journal of Polymer Science Part A: Polymer Chemistry
影响因子：
--
作者：
Qimin Jiang;Yongzhuang Du;Wenyan Huang;Jian-hai Chen;Hongjun Yang;X. Xue;Li Jiang;B. Jiang
通讯作者：
Qimin Jiang;Yongzhuang Du;Wenyan Huang;Jian-hai Chen;Hongjun Yang;X. Xue;Li Jiang;B. Jiang