Aqueous Assembly and Hydrogel Rheology of Sustainable Glyoxylate-Based Copolymers
Aqueous Assembly and Hydrogel Rheology of Sustainable Glyoxylate-Based Copolymers
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DOI：
10.1021/acsapm.2c00542
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发表时间：
2022-07-12
影响因子：
5
通讯作者：
Bhatia，Surita R.
中科院分区：
文献类型：
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作者：
Yin，Xuechen;Hewitt，David R. O.;Bhatia，Surita R.
利用流变学和小角中子散射（SANS）系统研究了聚（乙醛酸乙酯）-聚（环氧乙烷）-聚（乙醛酸乙酯）（PEtG-PEO-PEtG）三嵌段共聚物在水环境中的自组装。这些系统在水中形成缔合胶束凝胶，其中 PEtG 末端嵌段形成胶束核心，PEO 中间嵌段在胶束冠和胶束间桥中形成环。随着 PEtG 嵌段长度的增加，流变学显示出较慢的松弛行为，这与胶束间桥和缔合的较长寿命一致。自毁 PETG 嵌段的长度可用于调整嵌段共聚物凝胶的机械性能、纳米级疏水域的尺寸以及更大规模的组装行为。这些结果可以指导具有理想流变特性和纳米级结构的自毁嵌段共聚物的设计，适用于各种应用。
The self-assembly of poly(ethyl glyoxylate)–poly(ethylene oxide)–poly(ethyl glyoxylate) (PEtG–PEO–PEtG) triblock copolymers in aqueous environments was systematically studied by using rheology and small-angle neutron scattering (SANS). These systems form associative micellar gels in water, with the PEtG end-blocks forming micelle cores and the PEO mid-blocks forming loops in the micelle coronas and intermicellar bridges. As PEtG block length is increased, rheology shows slower relaxation behavior, consistent with a longer lifetime of intermicellar bridges and associations. The length of the self-immolative PEtG block can be used to tailor the mechanical properties, size of nanoscale hydrophobic domains, and larger-scale assembly behavior of the block copolymer gels. These results can guide the design of self-immolative block copolymers with desirable rheological properties and nanoscale structures for a variety of applications.