Journal
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
Volume 118, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijadhadh.2022.103220
Keywords
Adhesion promoter; Silicones; Lap -shear; Phenolic hydroxyl group; Acrylate group
Funding
- Key Lab of Guangdong Province for High Property and Functional Polymer Materials, and Analytical and Testing Center, South China University of Technology, Guangzhou
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A novel silicone adhesion promoter PMHS-g-(EE/TD) was synthesized, which effectively enhanced the bond strength between silicone rubber and polycarbonate and polyamide substrates. The bond strength remained high after heat treatment and water soaking. PMHS-g-(EE/TD) acted as a bridge to tightly connect the substrate and silicone rubber, improving the adhesion performance.
Grafting polar polysiloxanes to addition-cure liquid silicone rubber (ALSR) is a promising method to improve its adhesion performance. Herein, we synthesized a novel silicone adhesion promoter containing phenolic hydroxyl and acrylate groups via hydrosilylation reaction, denoted as PMHS-g-(EE/TD). It was found that PMHS-g-(EE/ TD) effectively enhanced the bond strength of ALSR with polycarbonate (PC) and polyamide (PA) substrates. When the PMHS-g-(EE/TD) content was 2 phr, the bond strength of ALSR with PC and PA substrates were 3.8 MPa and 3.1 MPa, respectively. More importantly, after being heat-treated at 150 degrees C for 72 h or soaked in 25 degrees C distilled water for 8 h, the bond strength of ALSR/PMHS-g-(EE/TD) with PC and PA substrates maintained a rather high value. The adhesion promotion mechanism of PMHS-g-(EE/TD) for ALSR was further discussed and revealed. On the one hand, PMHS-g-(EE/TD) participated in the curing process of ALSR through C--C bonds and formed chemical bond connections with the ALSR chain; on the other hand, PMHS-g-(EE/TD) was enriched on the ALSR surface to establish a boundary layer containing -OH and -COO, forming hydrogen bonds with the substrate. PMHS-g-(EE/TD) acted as a bridge to tightly connect the substrate and ALSR, which greatly improved the adhesion performance. This work provides a simple approach to fabricating ALSR with prominent adhesive properties.
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