Application of an Addition-Fragmentation-Chain Transfer Monomer in Di(meth)acrylate Network Formation to Reduce Polymerization Shrinkage Stress

Polymer Chemistry
Parag K ShahC N Bowman

Abstract

A new addition-fragmentation chain transfer (AFT) capable moiety was incorporated into a dimethacrylate monomer that participated readily in network formation by copolymerizing with multifunctional methacrylates or acrylates. The process of AFT occurred simultaneously with photopolymerization of the AFT monomer (AFM) and other (meth)acrylate monomers leading to polymer stress relaxation via network reconfiguration. At low loading levels of the AFM, a significant reduction in shrinkage stress, especially for acrylate monomers, was observed with nominal effects on conversion. At higher loading levels of the AFM, the photopolymerization reaction kinetics and final double bond conversion were significantly lowered along with a delay in the gel-point conversion. Electron paramagnetic resonance studies during polymerization revealed the presence of a distinct radical species that was present in proportional quantities to the AFM content in the system. The lifetime and the character of the persistent radicals were altered due to the presence of the distinctive radical, in turn affecting the polymerization kinetics. With polymerization conducted at higher irradiance, the differential conversion between the control resin and samples wit...Continue Reading

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Citations

Dec 7, 2018·Journal of Biomaterials Science. Polymer Edition·Shuzhen LuoJingwei He
Aug 2, 2018·Angewandte Chemie·Nathaniel CorriganCyrille Boyer
May 6, 2019·Journal of Dental Research·B M FronzaJ W Stansbury
Nov 2, 2019·Angewandte Chemie·Nathaniel CorriganCyrille Boyer
Feb 25, 2020·Journal of the Mechanical Behavior of Biomedical Materials·José Augusto Sedrez-PortoTatiana Pereira-Cenci
Feb 13, 2021·Dental Materials : Official Publication of the Academy of Dental Materials·Parag K Shah, Jeffrey W Stansbury
Mar 10, 2021·Dental Materials : Official Publication of the Academy of Dental Materials·Hamad AlgamaiahDavid C Watts
Mar 20, 2018·Dental Materials : Official Publication of the Academy of Dental Materials·William M PalinMohammed A Hadis
Jun 20, 2021·Dental Materials : Official Publication of the Academy of Dental Materials·Jiawei YangDavid C Watts
Dec 6, 2021·European Journal of Oral Sciences·Daniella Cristo SantinRafael Francisco Lia Mondelli

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