| 杨娥,陈玉侠,王飞利,周国庆,赵君民.化学通报,2015,78(6):552-557. |
| 聚丙烯酸-b-聚丙烯酸甲酯的制备及其在乳液聚合中的应用 |
| Synthesis of ploy(acrylic acid)-b-poly(methyl acrylate) and its application in emulsion polymerization |
| 投稿时间：2014-11-20 修订日期：2014-12-22 |
| DOI： |
| 中文关键词: RAFT聚合 嵌段共聚物 乳液聚合 |
| 英文关键词:reversible addition-fragmentation chain transfer polymerization, block copolymer, emulsion polymerization |
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| 中文摘要: |
| 采用S-1-十二烷基-S′-(а，а′-二甲基-а′′-乙酸)三硫代碳酸酯(MTTCD)作为链转移剂，偶氮二异丁腈(AIBN)为引发剂，丙烯酸(AA)为第一单体，通过可逆加成-断裂链转移(RAFT)自由基聚合合成大分子链转移剂PAA-MTTCD，以丙烯酸甲酯(MA)为第二单体，合成五种不同嵌段比的两亲性嵌段共聚物聚丙烯酸-b-聚丙烯酸甲酯（PAA-b-PMA）。采用傅里叶变换红外光谱(FTIR)和核磁共振氢谱(1H NMR)确定了大分子链转移剂PAA-MTTCD和两亲性嵌段共聚物PAA-b-PMA的结构，用凝胶渗透色谱(GPC)测定了PAA-MTTCD和PAA-b-PMA的分子量及分子量分布。分析了聚合反应动力学，发现该聚合具有活性可控聚合的特征，聚合动力学呈一级线性关系。测定了PAA-b-PMA的乳化性能，并将其作为乳化剂用于丙烯酸丁酯(BA)的乳液聚合中，同时考察了不同嵌段长度共聚物对乳液聚合的影响。结果表明，具有21个AA单元和18个MA单元的两亲性嵌段共聚物具有较好的乳化性能，其作为乳化剂时乳液聚合效果相对最好。 |
| 英文摘要: |
| Amphiphilic block copolymers ploy(acrylic acid)-b-poly(methyl acrylate)(PAA-b-PMA), with different block ratios were synthesized by reversible addition-fragmentation chain transfer(RAFT) living free radical polymerization, using S-1-dodecyl-S′-(а,а′-dimethyl-а′′-acetic acid) trithiocarbonate(MTTCD) as chain transfer agent, azodiisobutyronitrile(AIBN) as initiator, acrylic acid as the first monomer, methyl acrylate as the second monomer. The structure of the macro-chain transfer agent MTTCD-MAA and the block copolymers PAA-b-PMA were confirmed by fourier transform infrared(FTIR) and H1 nuclear magnetic resonance spectroscopy(H1 NMR), the molecular weight and polydispersity indexes were analyzed by gel permeation chromatography (GPC).The polymerization showed “living”/controlled characteristics. Reaction kinetics was first order and linear. The emulsifying properties of the PAA-b-PMA was researched. And it was employed as an emulsifier in butyl acrylate(BA) emulsion polymerization. The effect of the copolymers with different length of block on emulsion polymerization was investigated. The results indicated that the emulsifying properties and the effect of the emulsion polymerization were relatively better while PAA21-b-PMA18 used as an emulsifier. |
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