Department of Chemical Engineering, Queen's University, 19 Division St, Kingston, Ontario, K7L 3N6, Canada.
Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, K7L 3N6, Canada.
Macromol Rapid Commun. 2019 Jul;40(13):e1900087. doi: 10.1002/marc.201900087. Epub 2019 May 6.
The synthesis of diblock and triblock linear polyolefins via ring opening metathesis polymerization (ROMP) in an aqueous nanoparticle dispersion is presented. The different block polyolefins are synthesized from the cyclic olefins 1,5-cyclooctadiene and norbornene (NB), using a water-soluble TEGylated ruthenium alkylidene catalyst, yielding the structures PCOD-b-PNB, PNB-b-PCOD, and PCOD-b-PNB-b-PCOD. High monomer conversion (>90%), monitored by NMR, is achieved in relatively short times (≈1 h) for the polymerization of each block. The livingness of the system, essential to obtain block copolymers, is confirmed by gel permeation chromatography. Latex particles' size during the multiple steps range between 90 and 150 nm. The results demonstrate that it is possible to obtain nanoparticle latexes from ROMP-based monomers with block copolymer architectures, creating the opportunity to copolymerize olefins bearing different functional groups for the synthesis of new materials.
通过在水性纳米颗粒分散体中进行开环复分解聚合 (ROMP)，合成了二嵌段和三嵌段线性聚烯烃。使用水溶性 TEG 化钌亚烷基催化剂，从环状烯烃 1,5-环辛二烯和降冰片烯 (NB) 合成了不同的嵌段聚烯烃，得到了 PCOD-b-PNB、PNB-b-PCOD 和 PCOD-b-PNB-b-PCOD 结构。通过 NMR 监测，每种嵌段的聚合反应在相对较短的时间内（约 1 小时）即可实现高单体转化率 (>90%)。为了获得嵌段共聚物，体系的活性是必不可少的，这通过凝胶渗透色谱得到了证实。在多步过程中，乳胶粒子的大小在 90 到 150nm 之间。结果表明，有可能从基于 ROMP 的单体获得具有嵌段共聚物结构的纳米颗粒乳胶，从而为合成具有不同功能基团的烯烃共聚创造了机会，以合成新材料。
