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Highly Transparent Benzothiazole-Based Block and Random Copolymers with High Refractive Indices by RAFT Polymerization
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-07-08 , DOI: 10.1021/acsapm.0c00365
Yugo Sato 1 , Shigeki Sobu 1 , Kazuhiro Nakabayashi 1 , Sadaki Samitsu 2 , Hideharu Mori 1
Affiliation  

The development of thermally stable, highly transparent polymers with superior refractive indices and Abbe’s numbers are important for the further development of next-generation technology such as miniaturized opto-integrated devices and advanced lenses. Highly transparent benzothiazole-based copolymers having either block or random sequences and high refractive indices were synthesized by reversible addition–fragmentation chain transfer (RAFT) polymerization. The conventional free-radical and RAFT copolymerizations of 2-benzothiazolyl vinyl sulfide (BTVS) and 2-vinylnaphthalene (VNA) produced random copolymers with adjustable BTVS contents between 8 and 54%. Chain extending the macrochain transfer agent, which was prepared by the RAFT polymerization of BTVS, with VNA was well-controlled, enabling the synthesis of block copolymers with high BTVS contents (up to 70%) and reasonable polymer yields (up to 60%). The benzothiazole-based homopolymer, poly(BTVS), exhibited a high refractive index (1.7432) and a reasonable Abbe’s number (17.0). Excellent transmittances (>93%) of 400 nm light were observed for both copolymers composed of BTVS and VNA, and high refractive indices of 1.7178–1.6672 were achieved. The resulting benzothiazole-based copolymers exhibited high refractive indices (>1.7), high transparencies, tunable low glass-transition temperatures (Tg = 75–150 °C), and high thermal stabilities (Td5 > 240 °C) by adjusting the chemical structure, composition, and sequence of the comonomer. This report presents development of the first high-refractive-index polymers derived from S-vinyl sulfide derivatives with benzothiazole side chains, exhibiting the synergistic effects of combining aromatic naphthalene and heteroaromatic benzothiazole units.

中文翻译:

RAFT聚合的高透明指数的高透明苯并噻唑基嵌段和无规共聚物

具有优异的折射率和阿贝数的热稳定,高度透明的聚合物的开发对于下一代技术的进一步发展非常重要,例如小型光集成器件和高级透镜。通过可逆的加成-断裂链转移(RAFT)聚合合成具有嵌段或无规序列和高折射率的高度透明的苯并噻唑基共聚物。2-苯并噻唑基乙烯基硫醚(BTVS)和2-乙烯基萘(VNA)的常规自由基和RAFT共聚反应产生的BTVS含量在8%至54%之间的无规共聚物。通过BTVS的RAFT聚合和VNA制备的扩链大链转移剂受到良好控制,能够合成具有较高BTVS含量(最高70%)和合理的聚合物收率(最高60%)的嵌段共聚物。苯并噻唑基均聚物poly(BTVS)表现出高折射率(1.7432)和合理的阿贝数(17.0)。对于由BTVS和VNA组成的两种共聚物,均观察到400 nm光的极佳透射率(> 93%),并实现了1.7178–1.6672的高折射率。所得的苯并噻唑基共聚物表现出高折射率(> 1.7),高透明性,可调节的低玻璃化转变温度(BTVS和VNA组成的两种共聚物均观察到93%的400 nm光,并实现了1.7178–1.6672的高折射率。所得的苯并噻唑基共聚物表现出高折射率(> 1.7),高透明性,可调节的低玻璃化转变温度(BTVS和VNA组成的两种共聚物均观察到93%的400 nm光,并实现了1.7178–1.6672的高折射率。所得的苯并噻唑基共聚物表现出高折射率(> 1.7),高透明性,可调节的低玻璃化转变温度(T g = 75–150°C)和高热稳定性(T d5 > 240°C),可通过调节共聚单体的化学结构,组成和序列来实现。该报告提出了衍生自具有苯并噻唑侧链的S-乙烯基硫化物衍生物的第一批高折射率聚合物,其显示出结合芳族萘和杂芳族苯并噻唑单元的协同效应。
更新日期:2020-08-14
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