Scaling Behavior and Structure-Property Relationships of Multifunctional Ternary-Hydrogels Based on N-Alkyl Methacrylate Esters: Property Tunability through Versatile Synthesis


Bozbay R., Orakdöğen N.

MACROMOLECULAR THEORY AND SIMULATIONS, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Publication Date: 2021
  • Doi Number: 10.1002/mats.202100068
  • Title of Journal : MACROMOLECULAR THEORY AND SIMULATIONS
  • Keywords: crosslinking density, hydrogels, reduced modulus, scaling law, swelling, SWELLING BEHAVIOR, POLYMER NETWORKS, TEMPERATURE, PH, PARAMETERS, MODULUS, GELS

Abstract

Scaling behavior relating the synthesis conditions with swelling degree, preparation concentration and crosslinking density of multifunctional ternary-gels consisting of 2-(dimethylamino)ethyl methacrylate (DMAEMA), hydroxypropyl methacrylate (HPMA) and glycidyl methacrylate (GMA) is reported. Swelling is controlled by DMAEMA portion of terpolymers and DMAEMA-rich gels tended to swell more than GMA-rich gels and increase in GMA increase polymer-solvent interaction parameter, chi Critical conditions required for terpolymers to show phase transition are calculated as chi(1)=0.4993 and chi(2)=0.2959. Dependence of swelling degree phi(V)on gel preparation concentration nu 20 as a function of solvent quality is examined. Good solvent prediction of phi V approximate to(N over bar C nu 20)0.29 indicates a crossover between entanglement-dominated case and strongly cross-linked case corresponding to low and moderate degrees of swelling. Swelling of ternary-gels in different solvents shows that cyclohexanol is a good solvent and solubility parameter is 23.7 (MPa)(1/2). Addition of hydrophobic GMA leads to a significant increase in stiffness of terpolymer gels. Increase in elastic modulus as-prepared state is not monotonic and can be controlled by adjusting DMAEMA/GMA ratio since tertiary amine groups triggers cascading epoxy ring-opening reaction. Reduced modulus G(r) decreased with increasing swelling degree and scaling relation between modulus and swelling is found as G(r) approximate to (phi(V))(-0.66) which indicates that ternary-hydrogels, limited to weak stretching regime, obey Gaussian statistics.