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摘要
Two new block copolymers containing photocrosslinkable moieties, poly(2-cinnamoyloxyethyl methacrylate)-block-poly (N-methacryloyloxyethyl N'-adamantyl urea) (PCEMA-b-PMAdU) and poly(2-cinnamoyloxyethyl methacrylate)-block-poly( methyl methacrylate)-block-poly(N-methacryloyloxyethyl N'-adamantyl urea) (PCEMA-b-PMMA-b-PMAdU) were synthesized by atom transfer radical polymerization. The structure, thermal properties, and morphology of the synthesized copolymers were investigated by H-1 NMR and Fourier transform infrared/UV/vis spectroscopy, thermogravimetric analysis, differential scanning calorimetry, gel permeation chromatography, atomic force microscopy(AFM), and scanning electron microscopy/environmental scanning electron microscopy. 1H NMR analysis of the copolymer structure confirmed a molar fraction of adamantane units of 0.39 and of 0.66 for diblock and triblock copolymer, respectively. Special attention was given to the effect of UV/laser irradiation and operating conditions on the block copolymers properties, which could be exploited in the development of micro(nano) structures. The degree of phototransformation of cinnamate groups was between 57 (thin film) and 84% (solution). Modifications of the polymer morphology and surface roughness were induced after laser irradiation (308 and 248 nm) with different fluences (83-203 mJ cm(-2)). Also, copolymers solutions of different concentrations (c: 25% for PCEMA-b-PMAdU and c: 10, 15 and 20% for PCEMA-b-PMMA-b-PMAdU) were used in electrospinning/electrospraying processes for the preparing of micro/nano particles (0.5-2 mu m) and micro/nanofibers (0.6-2.6 mu m), the Gaussian distribution curves confirming that the resulting products are dimensionally homogeneous.
- 出版日期2013
