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, vol.31, no.2, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 31 Issue: 2
  • Publication Date: 2022
  • Doi Number: 10.1002/mats.202100068
  • Journal Name: MACROMOLECULAR THEORY AND SIMULATIONS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: crosslinking density, hydrogels, reduced modulus, scaling law, swelling, SWELLING BEHAVIOR, POLYMER NETWORKS, TEMPERATURE, PH, PARAMETERS, MODULUS, GELS
  • Istanbul Technical University Affiliated: Yes

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.