Related Experiment Video
Updated: May 30, 2025

Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
Published on: November 21, 2017
X-Ray Shielding Polymer Based on Sequential Polycondensation of BiPh3 and Carboxylic Acids and Radical Polymerization
Bungo Ochiai1, Ryo Kamiya1, Yoshimasa Matsumura2
1Graduate School of Science and Engineering, Yamagata University, Yonezawa 990-8510, Japan.
Abstract:
Transparent X-ray shielding polymer films were developed by bulk photo copolymerization of in situ prepared bismuth carboxylate prepolymers with polymerizable exomethylene moieties and N,N-dimethylacrylamide (DMAA). The bismuth-containing prepolymers were prepared via the polycondensation of BiPh3, 2-octenylsuccinic acid (OSA), and itaconic acid (IA) bearing an exomethylene group for polymerization. OSA was a chain extender by intermolecular condensation and a stopper by intramolecular cyclization to inhibit cross-linkage. The resulting photocured films exhibit high visible-light transparency and high nD, reaching 1.57. The X-ray shielding ability increased with the bismuth content and reached an aluminum equivalent of 0.80.
Related Concept Videos
Radical Chain-Growth Polymerization: Overview
Radical Chain-Growth Polymerization: Chain Branching
Free-Radical Chain Reaction and Polymerization of Alkenes
Radical Chain-Growth Polymerization: Mechanism
Cationic Chain-Growth Polymerization: Mechanism
Anionic Chain-Growth Polymerization: Overview

