文献类型：期刊文献

英文题名：Poly(vinyl alcohol) Nanocrystal-Assisted Hydrogels with High Toughness and Elastic Modulus for Three-Dimensional Printing

作者：Li, Ang[1];Si, Yi[2];Wang, Xiaohan[1];Jia, Xianjing[3];Guo, Xuhong[1,4,5];Xu, Yisheng[1,4,5]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Zhongshan Hosp Fudan Univ, Dept Vasc Surg, 180 Fenglin Rd, Shanghai 200032, Peoples R China;[3]East China Univ Sci & Technol, Sch Mat Sci & Engn, Lab Low Dimens Mat Chem, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China;[4]Shihezi Univ, Engn Res Ctr Xinjiang Bingtuan Mat Chem Engn, Shihezi 832000, Peoples R China;[5]East China Univ Sci & Technol, Int Joint Res Ctr Green Energy Chem Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：2

期号：2

起止页码：707

外文期刊名：ACS APPLIED NANO MATERIALS

收录：;EI(收录号：20193407351681);WOS:【SCI-EXPANDED(收录号:WOS:000469409900011)】；

基金：The authors gratefully acknowledge the financial support from the National Science Foundation of China (NSFC; No. 21676089, 5171101370). This work was also sponsored by Shanghai Talent Development Fund (2017038), Interantional One belt One Road Collaboration Project of Shanghai (18490740300), the Fundamental Research Funds for the Central Universities (222201717013, 22221818014), and 111 Project Grant (B08021).

语种：英文

外文关键词：poly(vinyl alcohol); crystallization; hydrogel; physical cross-link; 3D printing

摘要：Flexibility, diversity, and applicability in complicated situations are urgently required for next generation of tough hydrogels with good processability. To achieve this good performance, complicated chemical polymerization is conventionally involved in the preparation of tough hydrogels, which is tedious, energy-consuming, detrimental to the environment, and hard to scale up. In contrast, physically cross-linking primarily the electrostatic force is always adopted as complementary to chemical crosslinking. Here we propose a simple, nonpolymerization method to develop a novel type of dual physically cross-linked tough hydrogel, which consists of poly(vinyl alcohol) (PVA) crystallite cross-linked network, and hyaluronic acid-Fe3+ physically cross-linked network. Instead of using electrostatic interaction, nanosized PVA crystallites were chosen as major cross-linking sites for the primary network of the hydrogel. By annealing the freeze-thaw hydrogel followed by the Fe3+-carboxylic group complexation to construct the second network, extraordinary mechanical performance including excellent tensile strength (similar to 8 MPa), remarkable toughness (similar to 19.6 MJ/m(3)) and high elastic modulus (similar to 10MPa) was successfully achieved. Especially, the precursor solution with viscoelastic properties was demonstrated to as a "new" type of ink for three-dimensional (3D) printing with no UV curing is required. Such design provides a simple and new avenue for the preparation of tough hydrogels featured with 3D printing processability and we believe that the design can be potentially applied for building future soft devices.