Effect of α-methyl on the performance of photocurable 3D printing polyurethane materials

Author:

Fei Jianhua1ORCID,Du Xia2,Rong Youjie1,Zhu Lisheng1,Zhang Xiaomin1,Li Huijie1,Lu Xiaoxia3,Huang Xiaobo1ORCID

Affiliation:

1. Key Laboratory of Medical Metal Materials of Shanxi Province, College of Materials Science and Engineering, Taiyuan University of Technology 1 , Taiyuan, Shanxi Province 030024, People’s Republic of China

2. Department of Cardiology, Shanxi Cardiovascular Hospital, The Affiliated Cardiovascular Hospital of Shanxi Medical University 2 , Taiyuan 030001, China

3. Shanxi Biological Research Institute Co. Ltd. 3 , Taiyuan, Shanxi Province, China

Abstract

For photosensitive polyurethane systems, reactive diluents are indispensable components whose main role is to reduce the viscosity of the polyurethane prepolymer to meet the requirements of the photocurable 3D printing technology for high fluidity of the precursor solution. Generally, the reactive diluent would be involved in the photocuring reaction, which in turn has a remarkable impact on the mechanical, reaction kinetics, and thermodynamic characteristics of the photosensitive polyurethane system. However, this feature is usually neglected in the study of photosensitive urethane acrylate (PUA) systems, so there is a considerable necessity to investigate the mechanism of active diluents in the photocured reaction of PUA systems. In this work, the effects of α-methyl groups along the chains of diluent molecules on the photoreaction kinetics, photocurable 3D printing, mechanical and mechanical properties, and thermodynamic characteristics of PUAs were investigated employing hydroxyethyl methacrylate and hydroxyethyl acrylate as active diluents, respectively. The relationship between chemical structure and kinetics of PUA systems was also elucidated by using dynamic mechanical analysis tests. The results demonstrated that the α-methyl group blocks the migration of reactive radicals, reduces the efficiency of the photoreaction, and causes an increase in the rigidity and strength of the molecular chain. This study not only revealed the effect of α-methyl on the kinetic mechanical and thermal performance of PUA systems but also paves the way for the development of a new class of photosensitive PUA materials used for the photocurable 3D printing technology.

Funder

Xia Du

Xiaobo Huang

Publisher

AIP Publishing

Subject

Physical and Theoretical Chemistry,General Physics and Astronomy

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