Citation: Jia-Xing Wang, Yan-Bin Huang, Wan-Tai Yang. Photo-grafting Poly(acrylic acid) onto Poly(lactic acid) Chains in Solution[J]. Chinese Journal of Polymer Science, ;2020, 38(2): 137-142. doi: 10.1007/s10118-019-2308-y shu

Photo-grafting Poly(acrylic acid) onto Poly(lactic acid) Chains in Solution

Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Corresponding author: Yan-Bin Huang, yanbin@tsinghua.edu.cn
Received Date: 12 May 2019
Revised Date: 23 May 2019
Available Online: 12 September 2019

Poly(lactic acid) (PLA) is one of the most important bio-plastics, and chemical modification of the already-polymerized poly(lactic acid) chains may enable optimization of its material properties and expand its application areas. In this study, we demonstrated that poly(lactic acid) can be readily dissolved in acrylic acid at room temperature, and acrylic acid can be graft-polymerized onto poly(lactic acid) chains in solution with the help of photoinitiator benzophenone under 254 nm ultraviolet (UV) irradiation. Similar photo-grafting polymerization of acrylic acid (PAA) has only been studied before in the surface modification of polymer films. The graft ratio could be controlled by various reaction parameters, including irradiation time, benzophenone content, and monomer/polymer ratios. This photo-grafting reaction resulted in high graft ratio (graft ratio PAA/PLA up to 180%) without formation of homopolymers of acrylic acid. When the PAA/PLA graft ratio was higher than 100%, the resulting PLA-g-PAA polymer was found dispersible in water. The pros and cons of the photo-grafting reaction were also discussed.
- Photo-grafting,
- Polymer modification,
- Poly(acrylic acid),
- Poly(lactic acid)
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