| Title: | Effects of Grafting Degree on the Formation of Waterborne Polyurethane-Acrylate Film with Hard Core-Soft Shell Structure |
| Author(s): | Kwon YR; Moon SK; Kim HC; Kim JS; Kwon M; Kim DH; |
| Address: | "Materials & Component Convergence R&D Department, Korea Institute of Industrial Technology (KITECH), 143, Hanggaul-ro, Sangnok-gu, Ansan-si 15588, Republic of Korea. Department of Material Chemical Engineering, Hanyang University, 55, Hanggaul-ro, Sangnok-gu, Ansan-si 15588, Republic of Korea. School of Integrative Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea" |
| ISSN/ISBN: | 2073-4360 (Electronic) 2073-4360 (Linking) |
| Abstract: | "Waterborne polyurethane-acrylate (WPUA) grafted with polyurethane was prepared to improve the film-forming ability of hard-type acrylic latex. To balance the film-formation ability and hardness, the WPUA latex was designed with a hard core (polyacrylate) and soft shell (polyurethane). The grafting ratio was controlled through varying the content of 2-hydroxyethyl methacrylate (HEMA) used to cap the ends of the polyurethane prepolymer. The morphologies of the latex particles, film surface, and fracture surface of the film were characterized through transmission electron microscopy, atomic force microscopy, and scanning electron microscopy, respectively. An increase in the grafting ratio resulted in the enhanced miscibility of polyurethane and polyacrylate but reduced adhesion between particles and increased minimum film formation temperature. In addition, grafting was essential to obtain transparent WPUA films. Excessive grafting induced defects such as micropores within the film, leading to the decreased hardness and adhesive strength of the film. The optimal HEMA content for the preparation of a WPUA coating with excellent film-forming ability and high hardness in ambient conditions was noted to be 50%. The final WPUA film was prepared without coalescence agents that generate volatile organic compounds" |
| Keywords: | 2-hydroxyethyl methacrylate grafting minimum film formation temperature nano-indentation waterborne polyurethane-acrylate; |
| Notes: | "PublisherKwon, Yong Rok Moon, Seok Kyu Kim, Hae Chan Kim, Jung Soo Kwon, Miyeon Kim, Dong Hyun eng 20010566/Ministry of Trade, Industry and Energy/ Switzerland 2023/09/28 Polymers (Basel). 2023 Sep 14; 15(18):3765. doi: 10.3390/polym15183765" |
