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Phase Behavior of NR/PMMA Semi-IPNs and Development of Porous Structures

In this research, the porous polymer structures (IPN) were made from natural isoprene rubber (NR) and poly(methyl methacrylate) (PMMA). The effects of molecular weight and crosslink density of polyisoprene on the morphology and miscibility with PMMA were determined. Sequential semi-IPNs were prepare...

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Autores principales: John, Jacob, Klepac, Damir, Kurek, Mia, Ščetar, Mario, Galić, Kata, Valić, Srećko, Thomas, Sabu, Pius, Anitha
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10058802/
https://www.ncbi.nlm.nih.gov/pubmed/36987133
http://dx.doi.org/10.3390/polym15061353
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author John, Jacob
Klepac, Damir
Kurek, Mia
Ščetar, Mario
Galić, Kata
Valić, Srećko
Thomas, Sabu
Pius, Anitha
author_facet John, Jacob
Klepac, Damir
Kurek, Mia
Ščetar, Mario
Galić, Kata
Valić, Srećko
Thomas, Sabu
Pius, Anitha
author_sort John, Jacob
collection PubMed
description In this research, the porous polymer structures (IPN) were made from natural isoprene rubber (NR) and poly(methyl methacrylate) (PMMA). The effects of molecular weight and crosslink density of polyisoprene on the morphology and miscibility with PMMA were determined. Sequential semi-IPNs were prepared. Viscoelastic, thermal and mechanical properties of semi-IPN were studied. The results showed that the key factor influencing the miscibility in semi-IPN was the crosslinking density of the natural rubber. The degree of compatibility was increased by doubling the crosslinking level. The degree of miscibility at two different compositions was compared by simulations of the electron spin resonance spectra. Compatibility of semi-IPNs was found to be more efficient when the PMMA content was less than 40 wt.%. A nanometer-sized morphology was obtained for a NR/PMMA ratio of 50/50. Highly crosslinked elastic semi-IPN followed the storage modulus of PMMA after the glass transition as a result of certain degree of phase mixing and interlocked structure. It was shown that the morphology of the porous polymer network could be easily controlled by the proper choice of concentration and composition of crosslinking agent. A dual phase morphology resulted from the higher concentration and the lower crosslinking level. This was used for developing porous structures from the elastic semi-IPN. The mechanical performance was correlated with morphology, and the thermal stability was comparable with respect to pure NR. Investigated materials might be interesting for use as potential carriers of bioactive molecules aimed for innovative applications such as in food packaging.
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spelling pubmed-100588022023-03-30 Phase Behavior of NR/PMMA Semi-IPNs and Development of Porous Structures John, Jacob Klepac, Damir Kurek, Mia Ščetar, Mario Galić, Kata Valić, Srećko Thomas, Sabu Pius, Anitha Polymers (Basel) Article In this research, the porous polymer structures (IPN) were made from natural isoprene rubber (NR) and poly(methyl methacrylate) (PMMA). The effects of molecular weight and crosslink density of polyisoprene on the morphology and miscibility with PMMA were determined. Sequential semi-IPNs were prepared. Viscoelastic, thermal and mechanical properties of semi-IPN were studied. The results showed that the key factor influencing the miscibility in semi-IPN was the crosslinking density of the natural rubber. The degree of compatibility was increased by doubling the crosslinking level. The degree of miscibility at two different compositions was compared by simulations of the electron spin resonance spectra. Compatibility of semi-IPNs was found to be more efficient when the PMMA content was less than 40 wt.%. A nanometer-sized morphology was obtained for a NR/PMMA ratio of 50/50. Highly crosslinked elastic semi-IPN followed the storage modulus of PMMA after the glass transition as a result of certain degree of phase mixing and interlocked structure. It was shown that the morphology of the porous polymer network could be easily controlled by the proper choice of concentration and composition of crosslinking agent. A dual phase morphology resulted from the higher concentration and the lower crosslinking level. This was used for developing porous structures from the elastic semi-IPN. The mechanical performance was correlated with morphology, and the thermal stability was comparable with respect to pure NR. Investigated materials might be interesting for use as potential carriers of bioactive molecules aimed for innovative applications such as in food packaging. MDPI 2023-03-08 /pmc/articles/PMC10058802/ /pubmed/36987133 http://dx.doi.org/10.3390/polym15061353 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
John, Jacob
Klepac, Damir
Kurek, Mia
Ščetar, Mario
Galić, Kata
Valić, Srećko
Thomas, Sabu
Pius, Anitha
Phase Behavior of NR/PMMA Semi-IPNs and Development of Porous Structures
title Phase Behavior of NR/PMMA Semi-IPNs and Development of Porous Structures
title_full Phase Behavior of NR/PMMA Semi-IPNs and Development of Porous Structures
title_fullStr Phase Behavior of NR/PMMA Semi-IPNs and Development of Porous Structures
title_full_unstemmed Phase Behavior of NR/PMMA Semi-IPNs and Development of Porous Structures
title_short Phase Behavior of NR/PMMA Semi-IPNs and Development of Porous Structures
title_sort phase behavior of nr/pmma semi-ipns and development of porous structures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10058802/
https://www.ncbi.nlm.nih.gov/pubmed/36987133
http://dx.doi.org/10.3390/polym15061353
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