Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 5, Pages 6319-6327Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b21222
Keywords
chirality; emulsion polymerization; helical polymers; Janus particles; phase separation
Funding
- National Natural Science Foundation of China [21774009, 51973011, 21901231]
- Research Initiation Funds for Distinguished Associate Professor of Zhejiang Sci-Tech University [18012210-Y, 2018YBZX14]
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Polymer Janus particles (PJPs) have been extensively investigated due to their intriguing features which cannot be achieved in traditional counterparts. Chiral polymer particles also have constituted a unique research area in polymer science. However, how to construct PJPs derived from chiral polymers, especially chiral helical polymers, still remains a significant academic challenge. This contribution reports the first success in preparing optically active PJPs constructed by chiral helical substituted polyacetylene via emulsion polymerization combined with solvent evaporation to induce phase separation. In emulsion polymerization systems, polymethyl methacrylate worked as a template and separated from polyacetylene domains in the course of acetylenic monomers' polymerization and evaporation of the solvent, by which optically active PJPs were formed. The major influencing factors were explored to elucidate their effects on the formation and morphology of PJPs. Mushroom- and bowl-like PJPs were obtained. Scanning electron microscopy (SEM) images ascertain nonspherical morphologies of the obtained PJPs. Circular dichroism and UV-vis absorption spectra demonstrate their optical activity, which originated in the predominantly one-handed helical polyacetylene chains constructing the PJPs. A formation mechanism was then proposed for understanding this unprecedented type of PJPs.
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