Oligo-fluoropolymer Modified Cycloaliphatic Epoxy Resins with Excellent Compatibility, Waterproof and Mechanical Properties for LED Encapsulation

Abstract

An oligo-fluoropolymer(PFM) with functional cycloaliphatic epoxy and fluorinated groups was obtained via free radical polymerization and applied to the modification of cycloaliphatic epoxy resins(CE). The chemical structure of PFM was characterized by Fourier transform infrared(FTIR) spectroscopy, gel permeation chromatogra-phy(GPC) and nuclear magnetic resonance(NMR) spectroscopy, and the effects of different PFM concentra-tions(0.5%—6%, mass fraction) on the thermal resistance, mechanical properties, surface dewettability, light trans-mission, refractive index and various cured polymer properties were studied in detail. The DSC and TGA results demonstrate that the modified epoxy resins possess a higher thermal resistance than the neat epoxy resin. The im-provements in the surface dewettability and water resistance are caused by the high crosslinking density and the enrichment of the oligo-fluorinated random copolymers dispersed in the matrix. The fracture surface morphologies of the thermosets were investigated by scanning electron microscopy(SEM) and transmission electron microsco-py(TEM). It was observed that the optical transmittance of the composites was maintained even though microphase separation occurred during the curing process. With respect to the corresponding properties of the neat epoxy resins, the 2 phr(parts per hundreds of resin) PFM thermoset exhibited relatively better comprehensive properties, making the cured material a good candidate for light-emitting diode(LED) encapsulation.

Keywords

Oligo-fluoropolymer / Epoxy resin / Light-emitting diode / Encapsulate

References

[1] Vallo C. I., Asmussen S. V. Photocured Materials, 2015, London: The Royal Socie-ty of Chemistry, 321.

[2] Kim Y. H., Bae J. Y., Jin J., Bae B. S. ACS Applied Materials & In-terfaces, 2014, 6(5): 3115.

[3] Zhao M., Feng Y., Li G., Li Y., Wang Y., Sun X., Tan X. Polymers for Advanced Technologies, 2015, 25(9): 927.

[4] Wang L., Guo D. G., Zhu H., Xie L. RSC Advances, 2015, 5(65): 52888.

[5] Bae J., Kim Y. H., Kim H. Y., Lim Y., Bae B. S. RSC Advances, 2013, 3(23): 8871.

[6] Lee S., Hong J. Y., Jang J. Journal of Materials Chemistry C, 2014, 2(40): 8525.

[7] Sun Y., Liu W., Tan J., Wang H. Journal of Macromolecular Science, Part A, 2016, 53(4): 201.

[8] Li Y., Zhao M., Li G., Feng Y., Tan X., Han Y., Sun X. Polymer Ma-terials Science And Engineering, 2015, 31(1): 41.

[9] Yang X. F., Yang L. L., Cao C., Zhu X. B., Hua X. L. Chem. J. Chi-nese Universities, 2012, 33(5): 1078.

[10] Zhang W., Cheng L., Liu Y. New Chemical Materials, 2013, 41(5): 74.

[11] Chang C.J., Lai C., Chiou W., Reddy P. M., Su M. Journal of Ap-plied Polymer Science, 2017, 134(9): 44524.

[12] Ju Y. G., Almuneau G., Kim T. H., Lee B. W. Japanese Journal of Applied Physics, 2006, 45(4A): 2546.

[13] Chung P. T., Chiou S. H., Tseng C. Y., Chiang A. S. Acs Applied Materials & Interfaces, 2016, 8(15): 9986.

[14] Chung P. T., Yang C. T., Wang S. H., Chen C. W., Chiang A. S. T., Liu C. Y. Materials Chemistry and Physics, 2012, 136(2): 868.

[15] Kim J. S., Yang S. C., Bae B. S. Journal of Sol-gel Science and Technology, 2010, 53(2): 434.

[16] Chin L. W., Hung H. L., Shyang C. W. Journal of Physical Science, 2010, 21(1): 93.

[17] Yasumasa M., Seitarou T., Hiroshi S., Hiroaki S. Journal of Applied Polymer Science, 2006, 100(3): 2010.

[18] Lei I. A., Lai D. F., Don T. M., Chen W. C., Yu Y. Y., Chiu W. Y. Materials Chemistry and Physics, 2014, 144(1): 41.

[19] Gao N., Liu W. Q., Yan Z. L., Wang Z. F. Optical Materials, 2013, 35(3): 567.

[20] Lin Y. C., Zhou Y., Tran N. T., Shi F. G. Materials for Advanced Packaging, 2009, Boston: Springer US, 629.

[21] Munekata S. Progress in Organic Coatings, 1988, 16(2): 113.

[22] Tan J., Liu W., Wang Z. RSC Advances, 2016, 6(41): 34364.

[23] Yao W., Li Y., Huang X. Polymer, 2014, 55(24): 6197.

[24] Brostow W., Chonkaew W., Menard K. P., Scharf T. W. Materials Science and Engineering: A, 2009, 507(1): 241.

[25] Wang H., Liu W. Q., Tan J. Q., Xiahou G. Chem. Res. Chinese Universities, 2016, 32(2): 311.

[26] Yi F., Yu R., Zheng S., Li X. Polymer, 2011, 52(24): 5669.

[27] Higashihara T., Ueda M. Macromolecules, 2015, 48(7): 1915.

[28] Panzer J. Journal of Colloid and Interface Science, 1973, 44(1): 142.

[29] Gao N., Liu W. Q., Ma S. Q., Tang C. Y. Journal of Polymer Research, 2012, 19(8): 9923.

[30] Owens D. K. J., Wendt R. C. J. Journal of Applied Polymer Science, 1969, 13(8): 1741.

[31] Sun Y., Liu W. Polymer Bulletin, 2012, 68(1): 15.

[32] Raju T., Ding Y., He Y., Yang L., Paula M., Yang W., Tibor C., Sabu T. Polymer, 2008, 49(1): 278.

[33] Liao W. H., Hsiao S. T., Wu Y. F., Zeng S. J., Li S. M., Wang Y. S., Ma C. C. M. RSC Advances, 2014, 4(73): 38614.

[34] Guo Y., Liu W., Wang Z., Tan J. Acta Polymerica Sinica, 2016, 7(7): 919.