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- W1966224634 abstract "This work reports a gel network formed by rigid schizophyllan (SPG) chains with Borax as a cross-linking agent. The formed cross-links are nonpermanent and somewhat dynamic in nature because the cross-linking reaction is governed by a complexation equilibrium. Gelation processes are traced by dynamic viscoelastic measurements to examine the effects of Borax content, SPG concentration, temperature, salt concentration, salt type, and strain. The first-order kinetic model containing three parameters, t0 (induction time), 1/τc (gelation rate), and (saturated storage modulus), is successfully applied to describe the gelation of the SPG−Borax system. Gelation occurs faster at higher Borax content, higher SPG concentration, higher salt concentration, or lower temperature. Moreover the gelation is cation-type-specific. Storage modulus is a linear function of both Borax content and SPG concentration. The linear relationship between storage modulus and Borax content can be explained by a modified ideal rubber elasticity theory with a front factor α to take into account the presence of ineffective cross-links and the effect of SPG chain rigidity. On the other hand, the linear dependence of storage modulus on SPG concentration could be explained on the basis of chain−chain contacting behavior of extended SPG chains. Apparent activation energy and cross-linking enthalpy are calculated to be −74.5 and −32.4 kJ/mol for the present system. Strain sweep measurements manifest that the elasticity behavior of this gel starts to deviate from Gaussian-chain network at a small strain of 10%." @default.
- W1966224634 created "2016-06-24" @default.
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- W1966224634 date "2003-12-03" @default.
- W1966224634 modified "2023-09-23" @default.
- W1966224634 title "A Gel Network Constituted by Rigid Schizophyllan Chains and Nonpermanent Cross-Links" @default.
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- W1966224634 doi "https://doi.org/10.1021/bm034261n" @default.
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