Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 1, Issue 2, Pages 239-243Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am800143u
Keywords
thermal-sensitive; solvent-resistant; polymeric nanofibers; electrospinning; ATRP; RAFT; click chemistry; cross-linking
Funding
- Chinese Ministry of Education [108062]
- National Natural Science Foundation of China [20804009]
- Southeast University Foundation [400704112, 4007041023]
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, China.
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A simple method for preparing solvent-resistant nanofibers with a thermal surface has been developed by the combined technology of reversible addition fragmentation chain-transfer(RAFT) polymerization atom transfer radical polymerization (ATRP), electrospinning, and click chemistry. Initially, well-defined block copolymers of 4-vinylbenzyl chloride (VBC) and glycidylmethacrylate (GMA) (PVBC-b-PGMA) were prepared via RAFT polymerization. Electrospinning of PVBC-b-PGMA from a solution in tetrahydrofuran gave rise to fibers with diameters in the range of 0.4-1.5 mu m. Exposure to a solution of sodium azide (NaN3) not only affords nanofibers with azido groups on the surface but also leads to a cross-linking structure in the nanofibers. One more step of click chemistry between the PVBC-b-PGMA nanofibers with azido groups on on the surface (PVBC -b- PGMA(-N3)) and alkyne-terminated polymers of N-isopropylacrylamide (NIPAM) (PNIPAM(AT)), which were prepared by ATRP allows the preparation of a PVBC-b-PGMA nanofiber with thermal-sensitive PNIPAM brushes on the surface (PVBC-b-PGMA-g-PNIPAM). PVBC-b- PGMA nanofibers exhibit a good resistance to solvents and thermal-responsive character to the environment having a hydrophobic surface at 45 degrees C (water contact angle similar to 140 degrees) and having a hydrophilic surface at 20 degrees C (water contact angle similar to 30 degrees)
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