کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5179263 1502509 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Stretchable composite hydrogels incorporating modified cellulose nanofiber with dispersibility and polymerizability: Mechanical property control and nanofiber orientation
ترجمه فارسی عنوان
هیدروژل های کامپوزیتی قابل انعطاف با استفاده از نانوفیبری سلولز اصلاح شده با پراکندگی و پلیمریزاسیون: کنترل اموال مکانیکی و جهت گیری نانوفیبری
کلمات کلیدی
نانوفیلبر سلولز، هیدروژل کامپوزیت ویژگی های مکانیکی،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی


- We prepared stretchable hydrogels incorporating modified cellulose nanofiber (CNF).
- The surface modification of CNF was performed by maleic anhydride (MA).
- The modification endowed CNF with dispersibility and vinyl polymerizability.
- The hydrogels were prepared by in situ polymerization of NIPAM.
- MA-CNF content and orientation improved tensile strength of the hydrogels.

We fabricated composite hydrogels using surface-modified cellulose nanofiber (CNF) as a multifunctional crosslinker and N-isopropylacrylamide (NIPAM) as a monomer. Surface modification of CNF was performed using maleic anhydride (MA), which endowed the CNF with not only aqueous dispersibility but also vinyl polymerizability. We characterized the MA-modified CNF (MACNF) using wet chemical analysis, spectroscopy, and morphological observations. Hydrogels were prepared by in situ radical polymerization of mixtures of MACNF aqueous suspensions and NIPAM monomer, using a radical initiator and a catalyst under various conditions. The obtained hydrogels were transparent and highly stretchable (to more than 20 times their original length), and their mechanical properties, in particular, their tensile strength, could be controlled by exploiting the high dispersibility of the MACNF. Optical anisotropy measurements of the stretched gel specimens revealed that the MACNF fibers were highly oriented due to the large deformation, which led to an increase in the tensile strength of the specimens. A clear temperature dependence of the optical transmittance of the hydrogel samples was also observed, which originates from the coil-to-globule transition of poly(NIPAM) in aqueous media at its lower critical solution temperature.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 97, 5 August 2016, Pages 480-486
نویسندگان
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