Speaker
Description
Copolymers are widely employed in industrial processes because their physico-chemical properties, like strength, elasticity or thermal behaviour, can be modified by varying their macromolecular composition. Poly isobornyl acrylate (PIBOA) is a commercial available polymer with many attractive, industrial qualities, including excellent transparence, low refractive index, low thermal expansion, high weather resistance, and low birefringence [1,2]. In this work, we are interested in the development of a copolymer based on two acrylic monomers: Isobornyl Acrylate (IBOA) and 2- Ethylhexyl Acrylate (2-EHA). For this purpose we have prepared networks containing 60 wt.% of IBOA and 40 wt.% of 2-EHA using two different crosslinking agents: hexane-1,6-diol-diacrylate (HDDA) and acrylicacid 6- (4)-(6-acryloyloxy-hexyloxy) biphenyl-4-yloxy) hexyl ester (AHBH) and as a photoinitiator: 2-Hydroxy-2-methyl-1-phenyl-propan-1-one (Darocur). The mixtures obtained were irradiated under UV (λ = 365 nm). The polymerization was followed by Fourier Transform Infrared (FTIR) spectrophotometry, showing rapid kinetics in the presence of EHA. Then all the networks were characterized by the differential scanning calorimetry (DSC) [3,4] to determine the glass transition temperature (Tg) for the two copolymers. The swelling was studied by polarized light optical microscopy (POM) for the IBOA/EHA/HDDA copolymer, using organic solvents such as toluene and 1-heptanol. In addition the swelling study of IBOA/EHA/AHBH was investigated in nematic solvent 4- cyano-4'-n-pentylbiphenyl (5CB).
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- M. Mohammadi, H. Fazli, M. Karevan, J. Davoodi, Eur. Polym. J. 91 (2017), 121.
- J. Qu, J. Cheng, Z. Wang, X. Han, M. Zhao, Optical Mater. 36 (2014), 804-808.
- K. Urayama, Y.O. Arai, T. Takigawa, Macromolecules 38 (2005), 5721-5728.
| Preferred topic | Other |
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