聚苯乙烯-聚(2-乙烯基吡啶)二嵌段共聚物六方晶格在溶剂交换中的形成与转化《Langmuir》

Formation and Transformation of Polystyrene-block-poly(2-vinylpyridine) Hexasomes in the Solvent Exchange

Qiuya Zhang, Mengfan Lu, Hanyu Wu, Lu Zhang, Xunda Feng, and Zhaoxia Jin*

Key Laboratory of Advanced Light Conversion Materials and Biophotonics, Department of Chemistry, Renmin University of China, Beijing, 100872, China

Langmuir 2022, XXXX, XXX, XXX-XXX

Publication Date: October 5, 2022

https://doi.org/10.1021/acs.langmuir.2c01568

Abstract

The generation of inverse micellar nanostructures, especially those with open channels, using commercially available diblock copolymers (BCP), is vital for their wide applications in drug delivery and catalyst templating. However, the rigid requirements for forming inverse morphologies, such as the highly asymmetric molecular structures, the semicrystalline motifs, and concentrated solutions of diblock copolymers, represent obstacles to the development of successful strategies. In this study, the inverse polystyrene-block-poly(2-vinylpyridine) (PS30K-b-P2VP8.5K) micelles, i.e., the hexasomes with p6mm lattice, were generated through a modified solvent exchange via adding d-tartaric acid (d-TA) in the nonsolvent. Various intermediate morphologies have been identified with the change of d-TA concentration. Interestingly, in the high d-TA concentration (∼20 mg/mL), the hexasomes with close-packed hoops changed to mesoporous spheres with regularly packed perpendicular cylindrical channels (VD-TA: VBCP 6:100), and further to the mesoporous spheres with gyri-like open pores (VD-TA: VBCP > 15:100) with the increasing acidity in the mixed solvent. This study presents a simple and economical pathway for fabricating PS30K-b-P2VP8.5K hexasomes and first demonstrates these hexasomes can be modified to the morphology with open channels that will benefit their further applications.

SUBJECTS:

• Ketones,

• Micelles,

• Nanoparticles,

• Nanostructures,

• Solvents