Highly Flexible and Photo-Activating Acryl-Polyurethane for 3D Steric Architectures.

Highly Flexible and Photo-Activating Acryl-Polyurethane for 3D Steric Architectures.
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DOI:
10.3390/polym13060844
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发表时间:
2021-03-10
期刊:
影响因子:
5
通讯作者:
Huh P
Huh P
中科院分区:
工程技术3区
文献类型:
--
作者:
Bae JH;Won JC;Lim WB;Lee JH;Min JG;Kim SW;Kim JH;Huh P

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An acryl-functionalized polyurethane (PU) series was successfully synthesized using poly(tetramethylene ether) glycol-methylene diphenyl diisocyanate (PTMG-MDI) oligomer based on urethane methacrylates to control the flexibility of photo-cured 3D printing architectures. The mass ratio of acryl-urethane prepolymer: 1,4-butanediol (BD) chain-extender: diphenyl(2,4,6-trimethylbenzoyl) phosphine oxide (TPO) photoinitiator was 10:0.25:1. To produce suitably hard and precisely curved 3D architectures, the optimal UV absorbance and exposure energy of the acryl-PTMG-MDI resin were controlled precisely. Owing to the optimized viscosity of the acryl-PTMG-MDI resins, they could be printed readily by digital light processing (DLP) to form precisely curved 3D architectures after mixing with 1,6-hexanediol diacrylate (HDDA). The acryl-PTMG-MDI formulations showed much better flexural resolution than the neat resins. The printed 3D structure exhibited high surface hardness, good mechanical strength, and high elasticity for flexible applications in consumer/industrial and biomedical fields.
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