PALS probing of photopolymerization shrinkage in densely packed acrylate-type dental restorative composites | Zendy

Olha Shpotyuk | Zendy; A. Ingram | Zendy; O. Shpotyuk | Zendy; Andrii Miskiv | Zendy; Nina Smolar | Zendy

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PALS probing of photopolymerization shrinkage in densely packed acrylate-type dental restorative composites

Author(s) -

Olha Shpotyuk,

A. Ingram,

O. Shpotyuk,

Andrii Miskiv,

Nina Smolar

Publication year - 2020

Publication title -

polymers in medicine

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.129

H-Index - 11

eISSN - 2451-2699

pISSN - 0370-0747

DOI - 10.17219/pim/118394

Subject(s) - materials science , composite material , photopolymer , polymerization , polymer , composite number , positron , acrylate , electron , nuclear physics , copolymer , physics

Using positron annihilation lifetime spectroscopy (PALS), microstructural changes in commercial dental restorative composites under light-curing polymerization were identified as a modification in mixed positron/Ps trapping, where the decay of positronium (Ps; the bound state of positrons and electrons) is caused by free-volume holes mainly in the polymer matrix, and positron trapping is defined by interfacial free-volume holes in a mixed filler-polymer environment. In loosely packed composites with a filler content of <70-75%, this process was related to the conversion of Ps-to-positron trapping.

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