tailieunhanh - Báo cáo hóa học: " In situ Polymerization of Multi-Walled Carbon Nanotube/Nylon-6 Nanocomposites and Their Electrospun Nanofibers"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: In situ Polymerization of Multi-Walled Carbon Nanotube/Nylon-6 Nanocomposites and Their Electrospun Nanofibers | Nanoscale Res Lett 2009 4 39-46 DOI S11671-008-9199-0 NANO EXPRESS In situ Polymerization of Multi-Walled Carbon Nanotube Nylon-6 Nanocomposites and Their Electrospun Nanofibers Khalid Saeed Soo-Young Park Sajjad Haider Jong-Beom Baek Received 7 October 2008 Accepted 23 October 2008 Published online 18 November 2008 to the authors 2008 Abstract Multiwalled carbon nanotube nylon-6 nanocomposites MWNT nylon-6 were prepared by in situ polymerization whereby functionalized MWNTs F-MWNTs and pristine MWNTs P-MWNTs were used as reinforcing materials. The F-MWNTs were functionalized by Friedel-Crafts acylation which introduced aromatic amine COC6H4-NH2 groups onto the side wall. Scanning electron microscopy SEM images obtained from the fractured surfaces of the nanocomposites showed that the F-MWNTs in the nylon-6 matrix were well dispersed as compared to those of the P-MWNTs. Both nanocomposites could be electrospun into nanofibers in which the MWNTs were embedded and oriented along the nanofiber axis as confirmed by transmission electron microscopy. The specific strength and modulus of the MWNTs-reinforced nanofibers increased as compared to those of the neat nylon-6 nanofibers. The crystal structure of the nylon-6 in the MWNT nylon-6 nanofibers was mostly y-phase although that of the MWNT nylon-6 films which were prepared by hot-pressing the pellets between two aluminum plates and then quenching them in icy water was mostly a-phase indicating that the shear force during electrospinning might favor the y-phase similarly to the conventional fiber spinning. K. Saeed . Park H S. Haider Department of Polymer Science Kyungpook National University 1370 Sankyuk-dong Buk-gu Daegu 702-701 South Korea e-mail psy@ . Baek School of Chemical Engineering Chungbuk National University 12 Gaeshin Heungduk Cheongju Chungbuk 361-763 South Korea Keywords In situ polymerization Nylon-6 Nanofibers Carbon nanotube Nanocomposite Introduction Electrospinning is a .

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