期刊
POLYMER CHEMISTRY
卷 12, 期 10, 页码 1465-1475出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0py01193b
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资金
- Institut Carnot Chimie Balard Cirimat
- LabEx CheMISyst [ANR-10-LABX-05-01]
- IEM
- ICGM
Amphiphilic block copolymers PNIPAM-b-PVDF were synthesized via RAFT polymerization, capable of self-assembling into various morphologies which can be controlled by changing the DP of the PVDF block, and exhibiting thermosensitive behavior.
PNIPAM-b-PVDF (poly(N-isopropylacrylamide)-b-poly(vinylidene fluoride)) amphiphilic block copolymers (BCPs) were synthesized via RAFT polymerization from PNIPAM macromolecular chain transfer agents (macro-CTAs). PNIPAM was used as it is one of the few hydrophilic polymers soluble in dimethyl carbonate (DMC) and which can be synthesized using a xanthate CTA with relatively good control. The polymerizations were conducted at 73 degrees C in DMC using two PNIPAM macro-CTAs of different molar masses and targeting various DPs for the PVDF block. The RAFT polymerization of VDF resulted in relatively well-defined BCPs (D <= 1.50). These amphiphilic BCPs were able to self-assemble into various morphologies such as spherical, crumpled, lamellar and lenticular 2D aggregates by changing the common solvent or the self-assembly protocol. The size of the aggregates could be controlled by varying the DP of the PVDF block. The polymers were characterized by H-1 and F-19 NMR, SEC, TGA and DSC, and the assembled structures were studied by TEM, SEM and AFM. The thermosensitive behavior of the 2D lenticular aggregates was also examined.
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