One-Shot Preparation of Polybasic Ternary Hybrid Cryogels Consisting of Halloysite Nanotubes and Tertiary Amine Functional Groups: An Efficient and Convenient Way by Freezing-Induced Gelation.

Nur Sena Okten Besli,Nermin Orakdogen

doi:10.3390/gels7010016

Nur Sena Okten Besli, Nermin Orakdogen

Open Access

https://doi.org/10.3390/gels7010016

Copy DOI

Journal: Gels	Publication Date: Feb 5, 2021
Citations: 2	License type: CC BY 4.0

Affiliation: Istanbul Kültür University, Istanbul Technical University

Abstract

A convenient method for the preparation of polybasic ternary hybrid cryogels consisting of Halloysite nanotubes (HNTs) and tertiary amine functional groups by freezing-induced gelation is proposed. Ternary hybrid gels were produced via one-shot radical terpolymerization of 2-hydroxyethyl methacrylate (HEMA), 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS), and DEAEMA in the presence of HNTs. The equilibrium swelling in various swelling media and the mechanical properties of the produced ternary hybrid gels were analyzed to investigate their network structure and determine their final performance. The swelling ratio of HNT-free gels was significantly higher than the ternary hybrid gels composed of high amount of HNTs. The addition of HNTs to terpolymer network did not suppress pH- and temperature-sensitive behavior. While DEAEMA groups were effective for pH-sensitive swelling, it was determined that both HEMA and DEAEMA groups were effective in temperature-sensitive swelling. Ternary hybrid gels simultaneously demonstrated both negative and positive temperature-responsive swelling behavior. The swelling ratio changed considerably according to swelling temperature. Both DEAEMA and HEMA monomers in terpolymer structure were dominant in temperature-sensitive swelling. Mechanical tests in compression of both as-prepared and swollen-state demonstrated that strength and modulus of hybrid cryogels significantly increased with addition of HNTs without significant loss of mechanical strength. Ultimately, the results of the current system can benefit characterization with analysis tools for the application of innovative materials.

Highlights

With the rapid development of nanotechnology, novel nanoparticles have been used for manufacturing advanced nanomaterials, showing unique design possibilities and unusual property combinations [1,2,3,4,5]
A poly(alkyl methacrylate)-based ternary hybrid system consisting of halloysite nanotubes and tertiary amine functional groups in the form of cryogels and hydrogels nanotubes and tertiary amine functional groups in the form of cryogels and hydrogels
A poly(alkyl methacrylate)-based ternary hybrid system consisting of halloysite nanotubes and tertiary amine functional groups in the form of cryogels and hydrogels was designed in an efficient and convenient way via freezing-induced gelation

Summary

Introduction

With the rapid development of nanotechnology, novel nanoparticles have been used for manufacturing advanced nanomaterials, showing unique design possibilities and unusual property combinations [1,2,3,4,5]. By virtue of their large surface-to-volume ratio, which increases the number of interactions between the nanoparticles and polymer-based matrix, the nanomaterials may result in advanced structures for applications involving controlled/rapid release of drugs/solutes, active food packaging, chemical reactions, and higher barrier performance. Polybasic ternary hybrid gels consisting of Halloysite nanotubes (HNTs) and tertiary amine functional groups were designed with stimuli-responsive nature. Naturally-occurring HNT belongs to dioctahedral 1:1 clay mineral of the kaolin group with a predominantly hollow tubular structure with chemical formula

Objectives

Methods

Results

Conclusion