Hydrogen-Bonding UCST-Thermosensitive Nanogels by Direct Photo-RAFT Polymerization-Induced Self-Assembly in Aqueous Dispersion.,Macromolecular Rapid Communications

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Hydrogen-Bonding UCST-Thermosensitive Nanogels by Direct Photo-RAFT Polymerization-Induced Self-Assembly in Aqueous Dispersion.
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-06-05 , DOI: 10.1002/marc.202000203
Thi Nga Tran ₁ , Sandie Piogé ₁ , Laurent Fontaine ₁ , Sagrario Pascual ₁

Affiliation

Hydrogen‐bonding upper critical solution temperature (UCST) thermosensitive nanogels based on poly(N‐acryloyl glycinamide) (PNAGA) are synthesized by photo‐reversible addition‐fragmentation chain transfer mediated polymerization‐induced self‐assembly (photo‐RAFT PISA) in aqueous dispersion using N ,N ′‐methylenebis(acrylamide) as crosslinker and poly(oligo(ethylene glycol) methyl ether acrylate) as both stabilizer and macromolecular chain transfer agent (macro‐CTA). Highly stable, spherical nanogels with narrow polydispersity are efficiently produced up to complete monomer conversion within 1 h under UV irradiation at low temperature (3 °C). The thermosensitive behavior of PNAGA‐based nanogels, as assessed by dynamic light scattering and UV–vis spectrophotometry, exhibits reversible heating‐induced swelling and cooling‐induced shrinking corresponding to the expected UCST behavior. The hydrodynamic diameter, swelling ratio, and phase transition temperature of nanogels can be tuned by modifying the initial molar ratio of monomer‐to‐macro‐CTA and the amount of crosslinker in the photo‐RAFT PISA of NAGA.

中文翻译：

通过直接光-RAFT聚合在水分散体中诱导的自组装键合氢键的UCST热敏纳米凝胶。

通过光可逆加成-断裂链转移介导的聚合诱导自组装（photo-RAFT PISA）合成基于聚（N-丙烯酰基甘氨酰胺）（PNAGA）的氢键上限温度（UCST）热敏纳米凝胶使用分散ñ，ñ′-亚甲基双（丙烯酰胺）作为交联剂，聚（低聚乙二醇乙二醇甲基丙烯酸酯）作为稳定剂和大分子链转移剂（大分子CTA）。在低温（3°C）的紫外线照射下，可以高效地生产出具有窄多分散性的高度稳定的球形纳米凝胶，以在1小时内完成单体转化。通过动态光散射和紫外可见分光光度法评估的基于PNAGA的纳米凝胶的热敏行为表现出可逆的加热诱导的溶胀和冷却引起的收缩，与预期的UCST行为相对应。纳米凝胶的流体动力学直径，溶胀率和相变温度可以通过修改NAGA的光-RAFT PISA中的单体与宏观CTA的初始摩尔比和交联剂的量来进行调节。

更新日期：2020-07-13

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