Surface Effect of Silica Nano-Particles with Different Size on Thermotropic Liquid Crystalline Polyester Composites

Abstract

Interface properties of nano-silica/thermotropic liquid crystalline polyesters (TLCP) composites were investigated by X-ray diffraction analysis and differential scanning calorimetory. The crystallinity of TLCP in the composites drastically decreased with an increase of nano-silica content, depending on the surface area of the silica particles. Little size effects (40 - 400 nm) in the particles and strong interaction between silica surface and the C=O moieties of TLCP were observed by IR analysis. The glass transition temperature of TLCP (<20 nm) in silica surface increased about 20C higher than that in bulk.

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Fukatsu, H. , Kuno, M. , Matsuda, Y. and Tasaka, S. (2014) Surface Effect of Silica Nano-Particles with Different Size on Thermotropic Liquid Crystalline Polyester Composites. World Journal of Nano Science and Engineering, 4, 35-41. doi: 10.4236/wjnse.2014.42006.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1] Sawyer, L.C., Linstid, H.C. and Romer, M. (1998) Emerging Applications for Neat LCPs. Plastics Engineering (N.Y.), 54, 37-41.
[2] Park, S.K., Kim, S.H. and Hwang, J.T. (2009) Effect of Fumed Silica Nanoparticles on Glass Fiber Filled Thermotropic Liquid Crystalline Polymer Composites. Polymer Composites, 30, 309-317.
http://dx.doi.org/10.1002/pc.20557
[3] Voss, H. and Friedrich, K. (1986) Influence of Short-Fibre Reinforcement on the Fracture Behaviour of a Bulk Liquid Crystal Polymer. Journal of Materials Science, 21, 2889-2900.
http://dx.doi.org/10.1007/BF00551508
[4] Chivers, R.A. and Moore, D.R. (1991) Influence of Fibre Reinforcement on the Mechanical Anisotropy of Liquid Crystal Polymers. Polymer, 32, 2190-2198.
http://dx.doi.org/10.1016/0032-3861(91)90045-K
[5] Plummer, C.J.G., Zülle, B., Demarmels, A. and Kausch, H.-H. (1993) The Structure of Filled and Unfilled Thermotropic Liquid Crystalline Polymer Injection Moldings. Journal of Applied Polymer Science, 48, 751-766.
http://dx.doi.org/10.1002/app.1993.070480501
[6] Scaffaro, R., Pedretti, U. and La Mantia, F.P. (1996) Effects of Filler Type and Mixing Method on the Physical Properties of a Reinforced Semirigid Liquid Crystal Polymer. European Polymer Journal, 32, 869-875.
http://dx.doi.org/10.1016/0014-3057(96)00009-2
[7] Bhama, S. and Stupp, S.I. (1990) Liquid Crystal Polymer-Carbon Fiber Composites. Molecular Orientation. Polymer Engineering & Science, 30, 228-234.
http://dx.doi.org/10.1002/pen.760300406
[8] Lee, W.-G., Hsu, T.-C.J. and Su, A.C. (1994) Interphase Morphology of Liquid Crystalline Polymer/Glass Fiber Composites: Effect of Fiber Surface Treatment. Macromolecules, 27, 6551-6558.
http://dx.doi.org/10.1021/ma00100a046
[9] Zhang, X., Tasaka, S. and Inagakim N. (2000) Surface Mechanical Properties of Low-Molecular-Weight Polystyrene below Its Glass-Transition Temperatures. Journal of Polymer Science Part B: Polymer Physics, 28, 654-658.
http://dx.doi.org/10.1002/(SICI)1099-0488(20000301)38:5%3C654::AID-POLB2%3E3.0.CO;2-Z
[10] Zhang, X., Tasaka, S. and Inagaki, N. (2000) Studies on Surface Molecular Motion of Oligomeric Polystyrene by Differential Scanning Calorimetry. Polymers for Advanced Technologies, 11, 40-47.
http://dx.doi.org/10.1002/(SICI)1099-1581(200001)11:1%3C40::AID-PAT935%3E3.0.CO;2-%23
[11] Zhang, X., Tasaka, S. and Inagaki, N. (2003) Adhesion Behavior of Blends of Polybutadiene and Tackifiers. Journal of Adhesion Science and Technology, 17, 423-434.
http://dx.doi.org/10.1163/156856103762864714
[12] Romo-Uribe, A. and Windle, A.H. (1996) “Log-Rolling” Alignment in Main-Chain Thermotropic Liquid Crystalline Polymer Melts under Shear: An In-Situ WAXS Study. Macromolecules, 29, 6246-6255.
http://dx.doi.org/10.1021/ma960211h
[13] Kromer, H., Khun, R., Pielartzik, H., Siebke, W., Eckhardt, V. and Schmidt, M. (1991) Persistence Length and Molecular Mass Distribution of a Thermotropic Main-Chain Liquid-Crystal Polymer. Macromolecules, 24, 1950-1954.
http://dx.doi.org/10.1021/ma00008a036
[14] Chivers, R.A., Blackwell, J. and Gutierrez, G.A. (1984) The Structure of Copoly(4-hydroxybenzoic acid/2-hydroxy- 6-naphthoic Acid): 2. An Atomic Model for the Copolyester Chain. Polymer, 25, 435-440.
http://dx.doi.org/10.1016/0032-3861(84)90198-8
[15] Blackwell, J., Gutierrez, G.A. and Chivers, R.A. (1984) Diffraction by Aperiodic Polymer Chains: The Structure of Liquid Crystalline Copolyesters. Macromolecules, 17, 1219-1224.
http://dx.doi.org/10.1021/ma00136a019
[16] Blackwell, J., Biswas, A. and Bonart, R.C. (1985) X-Ray Studies of the Structure of Liquid-Crystalline Copolyesters: Treatment of an Atomic Model as a One-Dimensional Paracrystal. Macromolecules, 18, 2126-2130.
http://dx.doi.org/10.1021/ma00153a010
[17] Chivers, R.A. and Blackwell, J. (1985) Three-Dimensional Structure of Copolymers of p-Hydroxybenzoic Acid and 2-Hydroxy-6-Naphthoic Acid: A Model for Diffraction from a Nematic Structure. Polymer, 26, 997-1002.
http://dx.doi.org/10.1016/0032-3861(85)90219-8
[18] Biswas, A. and Blackwell, J. (1987) X-Ray Diffraction from Liquid-Crystalline Copolyesters: Matrix Methods for In- tensity Calculations Using a One-Dimensional Paracrystalline Model. Macromolecules, 20, 2997-3002.
http://dx.doi.org/10.1021/ma00178a008
[19] Mitchell, G.R. and Windle, A.H. (1985) Diffraction from Thermotropic Copolyester Molecules. Colloid and Polymer Science, 263, 230-244.
http://dx.doi.org/10.1007/BF01415509
[20] Gutierrez, G.A., Chivers, R.A., Blackwell, J., Stamatoff, J.B. and Yoon, H. (1983) The Structure of Liquid Crystalline Aromatic Copolyesters Prepared from 4-Hydroxybenzoic Acid and 2-Hydroxy-6-Naphthoic Acid. Polymer, 24, 937- 942.
http://dx.doi.org/10.1016/0032-3861(83)90141-6
[21] Mitchell, G.R. and Windle, A.H. (1983) Measurement of Molecular Orientation in Thermotropic Liquid Crystalline Polymers. Polymer, 24, 1513-1520.
http://dx.doi.org/10.1016/0032-3861(83)90164-7
[22] Achiha, O., Kyogoku, Y., Matsuda, Y. and Tasaka, S. (2012) Interfacial Structure of Composites of Poly(m-xylylen adipamide) and Silica Nano-Particles. Japanese Journal of Applied Physics, 51, 100204-1-3.
http://dx.doi.org/10.1143/JJAP.51.100204
[23] Soga, I. and Granick, S. (2000) Segmental Orientations of Trains versus Loops and Tails: The Adsorbed Polymethyl- methacrylate System When the Surface Coverage Is Incomplete. Colloids and Surface A, 170, 113-117.
http://dx.doi.org/10.1016/S0927-7757(00)00409-X

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