Improving Grafting Efficiency of Dicarboxylic Anhydride Monomer on Polylactic Acid by Manipulating Monomer Structure and Using Comonomer and Reducing Agent
| Autor: | Tao Liu, Hang Liu, Junna Xin, LinShu Liu, Tuan Liu, Wangcheng Liu, Tian Liu, Jinwen Zhang, William C. Hiscox |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Steric effects
Reducing agent General Chemical Engineering Comonomer Maleic anhydride 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Grafting 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Styrene chemistry.chemical_compound Monomer chemistry Polylactic acid Polymer chemistry 0210 nano-technology |
| Zdroj: | Industrial & Engineering Chemistry Research. 56:3920-3927 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/acs.iecr.6b05051 |
| Popis: | Maleic anhydride (MA) grafted polylactic acid (PLA) acting as reactive compatibilizer for PLA blends and composites has been reported. However, melt free-radical grafting of MA on PLA is often subject to steric and electron effects of the substituents in the monomer and low initiation efficiency, yielding low grafting efficiency (Eg). In this work, five dicarboxylic anhydride monomers, including MA, itaconic anhydride (IA), cis-1,2,3,6-tetrahydrophthalic anhydride (TA), 4-allyltrimellitate anhydride (ATA), and 4-methacryloxyethyl trimellitate anhydride (META), were grafted onto PLA, and the effect of steric hindrance on Eg was assessed. It is noted that Eg values followed the order of ATA > META ≫ MA ≥ TA > IA. The introduction of styrene as a comonomer selectively increased the Eg values of three electron-deficient monomers, MA, IA, and META, while Sn(Oct)2 as a reducing agent increased Eg for all monomers. Both styrene and Sn(Oct)2 exhibited a synergistic effect when used in grafting MA, IA, and META. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|