Preparation and Characterization of Thermally Expandable Microspheres

Abstract:

The thermally expandable microspheres were prepared through suspension polymerization with acrylonitrile (AN), methyl methacrylate (MMA) and methyl acrylate (MA) as monomers. The experimental results showed that it was possible to apply suspension polymerization to prepare the high foaming ratio and equally distributed microcapsules when water and oil phase volume ratio of 3:1, AN-MMA-MA in the proportion of 70%/20%/10% (m/m/m), and 1,4-butanediol dimethacrylate (BDDMA) as the crosslinking agents. Furthermore, the structure and property of shell and nuclear were characterized by Infrared Spectra (IR), Scanning Electron Microscopy (SEM) and Thermal analysis (TG, DTG). The structure characteristics and effective factors of copolymer coated core materials, morphologies, particle sizes, foaming temperature and ratio of microcapsules were investigated in this paper.

• Periodical: Materials Science Forum (Volume 852)
• Pages: 596-600
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.852.596
• Online since: April 2016
• Authors: Shu Ying Chen, Zhi Cheng Sun, Lu Hai Li
• Keywords: Characterization, Preparation, Suspension Polymerization, Thermally Expandable Microspheres

References

[1] Yasuhiro Kawaguchi, Tsutomu Oishi. Synthesis and properties of thermoplastic expandable Microspheres: The relation between crosslinking density and expandable property [J]. Journal of Applied Polymer Science, 2004, 93: 505-512.

DOI: 10.1002/app.20460

[2] Yasuhiro Kawaguchi, Daiehi Ito, et al. Thermally Expandable Microcapsules for Polymer Foaming-Relationship between expandability and viscoelasticity [J]. POLYMER ENGINEERING AND SCIENCE. 2010, 50(4): 835-842.

DOI: 10.1002/pen.21595

[3] Zhao-Sheng Hou，Cheng-You Kan. Preparation and properties of thermo expandable polymeric microspheres [J]. Chinese Chemical Letters. 2014, 25: 1279-1281.

DOI: 10.1016/j.cclet.2014.04.011

[4] Yaodong Huang. Preparation of thermally expandable Polymer Particles [D]. America: Lehigh University, 2004: l-252.

[5] Yasuhiro Kawaguchi, Yosuke Itamura, et al. Effects of the chemical structure on the heat resistance of thermoplastic expandable microspheres [J]. Journal of Applied Polymer Science, 2005, 96: 1306-1312.

DOI: 10.1002/app.21429

[6] Massimo Tomalino, Giovanni Bianchini. Heat-expandable microspheres for car protection production [J]. Progress in Organic Coatings, 1997, 32: 17-24.

DOI: 10.1016/s0300-9440(97)00080-5

[7] Magnus Jonsson，Ove Nordin，Eva Malmstro，et al. Thermally Expandable Microspheres with Excellent Expansion Characteristics at High Temperature [J]. Journal of Applied Polymer Science，2010, 117: 384-392.

DOI: 10.1002/app.31543

[8] Yuichi Nishiyama, Nobuyuki Uto, Chiaki Sato, et al. Dismantlement behavior and strength of dismantlable adhesive including thermally expansive particles [J]. International Journal of Adhesion & Adhesives. 2003, 23: 377-382.

DOI: 10.1016/s0143-7496(03)00067-8

[9] M.D. Banea, L.F.M. da Silva, R.J.C. Carbas. Debonding on command of adhesive joints for the automotive industry [J]. International Journal of Adhesion & Adhesives. 2015, 59: 14-20.

DOI: 10.1016/j.ijadhadh.2015.01.014

[10] J. Morehouse, R.J. Expansible thermoplastic polymer particles containing volatile fluid foaming agent and method of foaming the same [P]. US Patent, 3, 615, 972, (1971).

[11] JL Garner, PA Tiffany. Method for expanding microspheres and expandable composition [P]. US Patent: 4, 179, 546, (1979).

[12] M Kawata, K Takatou. Engine exhaust system [P]. US Patent: 4, 756, 561, (1988).

[13] W Von Bonin, UVON Gizycki. Fireproofing, layers of textiles and expandable graphite sewn together, construction materials [P]. US Patent: 5, 258, 216, (1993).

[14] Magnus Jonsson, OveNordin, et al. Suspension polymerization of thermally expandable core/shell particles [J]. Polymer, 2006, 47: 3315–3324.

DOI: 10.1016/j.polymer.2006.03.013

[15] JESSICA FREDLUND. Synthesis of Thermo Expandable Microspheres [D]. Master of Science Thesis Sundsvall, Sweden (2011).