Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 136, Issue 34, Pages -Publisher
WILEY
DOI: 10.1002/app.47895
Keywords
copolymers; optical properties; ring-opening polymerization; synthesis and processing techniques; thermal properties
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Funding
- Penchem Technology Sdn Bhd
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This work aims to synthesize new series of polysiloxane copolymer through hydrosilylation reaction based on different level of crosslink densities and phenyl content. The results revealed that polysiloxanes resins with phenyl rings increased viscosity up to 3800 cps while displaying a relatively high refractive index of 1.531. The asymmetric phenyl substitution onto chain backbone led to formation of densely packed structure resulting in reduced water absorption and gas permeability of PDMS resins. High level of crosslinking contributed to a high shore A hardness and adhesion strength. It displayed transparency of 97% whose percentage reduction was 1.6% under thermal and 0.6% UV aging. No obvious discoloration was observed during accelerated thermal aging up to 210 min at 80 degrees C. These results are key attributes that make the synthesized polysiloxane series as ideal candidate for high brightness LED encapsulant. (c) 2019 Wiley Periodicals, Inc. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47895.
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