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Preparation and Performance of Poly(butyl fumarate)-Based Material for Potential Application in LED Encapsulation

State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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Academic Editor: Greta Ricarda Patzke
Materials 2017, 10(2), 149; https://doi.org/10.3390/ma10020149
Received: 19 December 2016 / Revised: 19 January 2017 / Accepted: 3 February 2017 / Published: 11 February 2017
A UV-curable poly(butyl fumarate) (PBF)/poly(propylene fumarate)-diacrylate (PPF-DA) hybrid material with good performance for LED encapsulation is introduced in the paper. They have been prepared by radical polymerization using PBF and PPF-DA macromers with a UV curing system. PBF and PPF-DA were characterized by Fourier-transform infrared (FT-IR) and H-nuclear magnetic resonance (1H NMR). The thermal behavior, optical and mechanical properties of the material were examined by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), ultraviolet-visible spectroscopy (UV–vis), and a material testing system mechanical testing machine, respectively. The results indicated that the hybrid material has a suitable refractive index (n = 1.537) and high transmittance (99.64% in visible range) before/after thermal aging. With the increasing of the double bond ratio from 0.5 to 2, the water absorption ratios of the prepared encapsulation material were 1.22%, 1.87% and 2.88%, respectively. The mechanical property experiments showed that bonding strength was in the range of 1.86–3.40 MPa, tensile-shear strength ranged from 0.84 MPa to 1.57 MPa, and compression strength was in the range of 5.10–27.65 MPa. The cured PBF/PPF-DA hybrid material can be used as a light-emitting diode (LED) encapsulant, owing to its suitable refractive index, high transparency, excellent thermal stability, lower water absorption, and good mechanical properties. View Full-Text
Keywords: poly(butyl fumarate)-based polymer; composites; characterization; UV-curing; LED encapsulant poly(butyl fumarate)-based polymer; composites; characterization; UV-curing; LED encapsulant
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Wang, L.; Guo, D.-G. Preparation and Performance of Poly(butyl fumarate)-Based Material for Potential Application in LED Encapsulation. Materials 2017, 10, 149.

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