期刊
ACS APPLIED POLYMER MATERIALS
卷 5, 期 1, 页码 552-559出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.2c01648
关键词
aerogel fiber; coaxial wet spinning; porous structure; thermal insulation; mechanical strength
We developed a simple and efficient method to fabricate polymer-encapsulated aerogel fibers through coaxial wet spinning and conventional freeze drying. The fibers exhibit a porous aerogel network structure of the core layer and porous sheath layer. With excellent mechanical properties and thermal insulation performance, the fibers have promising applications in personal thermal management.
Polymer-encapsulated aerogel fibers with high porosity, low density, and good mechanical properties are promising candidates for thermal insulation materials. However, the fabrication of polymer-encapsulated aerogel fibers needs complex processes, which hinders continuous and large-scale fabrication. Herein, we developed a simple yet efficient strategy to continuously fabricate polymer-encapsulated aerogel fibers through coaxial wet spinning followed by conventional freeze drying. The coaxial wet-spinning step features stepwise coagulations containing an inner aerogel precursor as the first coagulation bath and a subsequent water bath as the second coagulation bath. The morphology of polymer-encapsulated aerogel fibers exhibits a porous aerogel network structure of the core layer and porous sheath layer. Thus, the as-prepared aerogel fiber, with cellulose acetate/poly(acrylic acid) (CA/PAA) as the sheath layer and a cellulose nanofiber (CNF) aerogel as the core, possesses low sheath layer density (0.25 g cm-3) and high aerogel core porosity (99.34%). Due to the good mechanical properties of the CA/PAA sheath, the CA/PAA@CNF aerogel fiber shows a high tensile strength of 5.83 MPa. Moreover, the CA/PAA@CNF aerogel fiber exhibits an excellent thermal insulation performance (0.054 W m-1 K-1) ascribed to the multistage porous structure of the fiber, which can significantly reduce heat convection and heat transfer. The good mechanical properties and excellent thermal insulation performance endow the polymer-encapsulated aerogel fibers with promising application in the field of personal thermal management.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据