Preparation of microgel composite hydrogels by heating natural drying microgel composite polymers. Issue 19 (30th April 2014)

• Record Type: Journal Article
• Authors: Zhao, Fang; Qin, Xuping; Feng, Shengyu; Gao, Yang
• Is Part Of: Journal of applied polymer science. Volume 131:Issue 19(2014:Oct. 05)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2014-04-30
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.40841
• Languages: English
• ISSNs: 0021-8995

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>Acrylamide‐<italic>co</italic>‐2‐acrylamido‐2‐methylpropane sulfonic acid‐based microgel composite (MC) hydrogels were prepared by heating natural drying MC polymers. It can reduce the influence of water content on the hydrogel properties. The natural drying MC polymer was swelling when the microgel content exceeded 0.5. It was soluble when the microgel content was 0.25, which was used to investigate the heating conditions. Under 50°C, MC hydrogels was obtained and hydrogen bonding was the reason for their formation. The tensile strength increased and the tensile elongation decreased as the heating time increased. When the heating time was 3 h, the tensile elongation decreased, as the heating temperature increased from 50°C to 80°C. However, the tensile strength increased first and then decreased. Under 60°C, the MC hydrogel had a high tensile strength of 155.3 kPa and a high tensile elongation of 313.3%. The more crosslinking density and the formation of covalent crosslinking bonds between the microgel particles and hydrogel matrix led to an increase in the tensile strength. However, the excess crosslinking of the polymer chains under high temperature could reduce the tensile strength. The tensile strength increased as the microgel content increased to 0.75 and then decreased as microgel content further increased. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. <bold>2014</bold>, <italic>131</italic>, 40841.</p> </abstract>