32 8 2011 8 Journal of Textile Research Vol. 32 No. 8 Aug. 2011 0253-9721 2011 08-0007-05 1 1 2 1 1. 310018 2. 310036 / FE-SEM DSC TGA TEM 0. 5% TB 332 A Structure and properties of poly lactide-co-glycolide ultrafine fibers adjusted and controlled by multi-walled carbon nanotubes XIAO Hongwei 1 LI Ni 1 XIE Junjun 2 XIONG Jie 1 1. Key Laboratory of Advanced Textile Materials and Manufacturing Technology Ministry of Education Zhejiang Sci-Tech University Hangzhou Zhejiang 310018 China 2. Affiliated Hospital of Hangzhou Normal University Hangzhou Zhejiang 310036 China Abstract The blend solutions consisted of modified multi-walled carbon nanotubes MWNTs and poly lactide-co-glycolide PLGA were prepared by ultrasonic processing. MWNTs / PLGA composite ultrafine fibers were prepared by electrospinning the blend solutions. The surface morphology thermal properties mechanical properties of the fibers and the dispersion and orientation of MWNTs were examined by field emission scanning electron microscope FE-SEM differential scanning calorimetry DSC thermogravimetry analysis TGA multi-purpose tensile tester and transmission electron microscopy TEM. The results show that the fiber diameter decreases and the thermal stability improves significantly with the addition of MWNTs and when MWNTs mass fraction is 0. 5% the dispersion orientation and reinforcing effect of MWNTs in fibers are optimum. Key words MWNTs PLGA electrospinning ultrafine fiber PLGA 2010-08 - 28 2010-11 - 09 973 2008CB617506 Z4100798 IRT0654 2009A013 1985 E-mail jxiong@ zstu. edu. cn
8 32 1. 3 ECM S4800 FE-SEM 1-2 MWNTs / PLGA MWNTs Image-Pro Plus 200 kv JEM2100 TEM MWNTs Pyris Diamond DSC TGA Perkin Elmer 40 ~ 80 30 ~ 600 2 / min 3 10 / min KES-G1 Kato-Tech MWNTs 2 cm 0. 1 cm / s PLGA MWNTs / PLGA 2 MWNTs PLGA 2. 1 MWNTs / PLGA 1 MWNTs / PLGA FE- SEM MWNTs 1 Image- 1. 1 Pro Plus PLGA PLGA LA GA 75 25 0. 1% MWNTs 1 043 nm 10 0. 15 ~ 3. 0 dl / g 596 nm 2 HFIP MWNTs PLGA MWNTs Arkema 1. 2 1. 2. 1 MWNTs MWNTs PLGA MWNTs MWNTs MWNTs 1 a e MWNTs MWNTs 1 1 MWNTs 10 min MWNTs ph 7 80 1. 2. 2 MWNTs / PLGA MWNTs MWNTs MWNTs 2 h MWNTs PLGA 10% 0 0. 1% 0. 5% 1. 0% 1. 5% 0. 5 cm 4 cm 4-5 MWNTs 1 d e MWNTs 2. 2 PLGA MWNTs MWNTs 3 MWNTs 12 h MWNTs / PLGA 3 a b MWNTs 2 h 15 kv 0. 6 ml / h 12 cm 24 h
8 9 1 Fig. 1 MWNTs / PLGA FE-SEM 5 000 FE-SEM images of electrospun MWNTs / PLGA ultrafine fibers MWNTs MWNTs Salalhaetal 6 CNTs / SWNTs MWNTs 1% MWNTs 2 MWNTs / PLGA MWNTs 1. 5% Fig. 2 Average diameters of PLGA ultrafine fibers with different MWNTs contents 3 c d Fig. 3 3 MWNTs / PLGA TEM images of electrospun MWNTs / PLGA ultrafine fibers
10 32 2. 3 MWNTs / PLGA 4 MWNTs / PLGA DSC a PLGA 54. 8 0. 5% 1. 0% MWNTs 55. 9 56. 4 b c MWNTs PLGA MWNTs PLGA a b c MWNTs 0 0. 1% 1. 0% 5 MWNTs / PLGA TGA MWNTs / PLGA Fig. 5 TGA curves of electrospun MWNTs / PLGA ultrafine fibers a b c MWNTs 0 0. 5% 1. 0% 4 MWNTs / PLGA DSC Fig. 4 DSC thermograms of electrospun MWNTs / PLGA ultrafine fibers 2. 4 MWNTs / PLGA 6 MWNTs PLGA a b 1 MWNTs 0. 5% 21. 5 MPa 110. 3 MPa 399. 6 MPa MWNTs MWNTs MWNTs MWNTs PLGA MWNTs / PLGA 5 TGA MWNTs 0% 0. 1% 1. 0% 234 287 296 80% 296 308 311 MWNTs 1 MWNTs MWNTs / PLGA a b c d e MWNTs 7 2 MWNTs 0 0. 1% 0. 5% 1. 0% 1. 5% 6 MWNTs / PLGA PLGA 8 Fig. 6 Stress-strain curves of electrospun MWNTs / PLGA 3 MWNTs ultrafine fibrous membranes 9 MWNTs 2 PLGA MWNTs
8 11 MWNTs MWNTs 1 LU L C YASZEMSKI M J MIKOS A G. Poly lactideco-glycolide / hydroxyapatite delivery of BMP-2- producing cells a regional gene therapy approach to MWNTs bone regeneration J. Biomaterials 2001 22 MWNTs 1271-1277. MWNTs- 10 2 WEN F CHANG S TOH Y C et al. Development of MWNTs poly lactic-co-glycolic acid -collagen scaffolds for tissue engineering J. Mater Sci Eng C 2007 27 285-292. 3 XIE X L MAI Y W ZHOU X P. Dispersion and MWNTs 1% 1. 5% alignment of carbon nanotubes in polymer matrix a review J. Materials Science and Engineering 2005 MWNTs MWNTs 49 89-112. 4 CHEN H P LIU Z CEBE P. Chain confinement in electrospun nanofibers of PET with carbon 11 nanotubes J. Polymer 2009 50 872-880. 5 LEE B H J YOON O J KIM D H et al. Neurite MWNTs outgrowth on nanocomposite scaffolds synthesized from MWNTs PLGA and carboxylated carbon J. Advanced Biomaterials 2009 11 261-266. 6 SALALHA W DROR Y KHALFIN R L et al. Singlewalled carbon nanotubes embedded in oriented polymeric 1 MWNTs / PLGA nanofibers by electrospinning J. Langmuir 2004 n = 5 Tab. 1 Mechanical properties of electrospun MWNTs / PLGA ultrafine fibrous membranes n = 5 MWNTs / / / / % MPa % MPa 0 11. 9 234 110. 3 0. 1 18. 2 240 270. 1 0. 5 21. 5 182 399. 6 1. 0 16. 9 143 380. 0 1. 5 15. 7 83 259. 7 3 20 9852-9855. 7 MONIRUZZAMAN M WINEY K I. Polymer nanocomposites containing carbon nanotubes J. Macromolecules 2006 39 5194-5205. 8 WU D F WU L ZHANG M et al. Viscoelasticity and thermal stability of polylactide composites with various functionalized carbon nanotubes J. Polymer Degradation and Stability 2008 93 1577-1584. 9 BARUS S ZANETTI M BRACCO P et al. Influence of MWCNT morphology on dispersion and thermal properties of polyethylene nanocomposites J. Polymer Degradation and Stability 2010 95 5 756-762. MWNTs / PLGA 10 YE H H LAM H TITCHENAL N et al. Reinforcement and rupture behavior of carbon nanotubespolymer nanofibers J. Applied Physics Letters MWNTs MWNTs 2004 85 10 1775-1777. MWNTs 11 SALVETAT J P BRIGGS A D BONARD J M et al. Elastic and shear moduli of single-walled carbon MWNTs 0. 5% manotube ropes J. Phys Rev Lett 1999 82 FZXB 944-947.