Enhancing the Thermomechanical Properties of Photopolymer Networks Using Small-Molecular-Weight Hyperbranched Prepolymer Additives

IF 5.1 1区化学 Q1 POLYMER SCIENCE

Macromolecules Pub Date : 2025-02-09 DOI:10.1021/acs.macromol.4c02992

Luis L. Jessen, Tanner L. Grover, Nicholas V. Oberbroeckling, Robin Willemse, C. Allan Guymon

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Abstract

Photoiniferter RAFT polymerization was utilized to synthesize and functionalize small-molecular-weight hyperbranched prepolymers (HBPs). HBPs were incorporated in densely cross-linking photocurable systems to investigate the impact of their size and structure on resin and material properties. The incorporation of HBPs induced a significant reduction in viscosity, enhanced network homogeneity, and increased material toughness compared to linear prepolymer counterparts. When shrinkage stress was normalized using the Young’s modulus of the final network, lower shrinkage stresses were observed for HBP-modified systems, especially when functionalized with pendant acrylate groups. In comparison to commercial linear urethane diacrylate cross-linkers, the HBP-modified network showed significantly enhanced network homogeneity and mechanical toughness. This study demonstrates that HBPs enable access to reduced resin viscosity and shrinkage stress as well as enhanced network homogeneity compared to conventional linear oligomer additives in densely cross-linked photocurable systems.

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来源期刊

Macromolecules 工程技术-高分子科学

CiteScore

9.30

自引率

16.40%

发文量

942

审稿时长

2 months

期刊介绍： Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.