Abstract
A polydimethylsiloxane armed with epoxy, alkoxy and acrylate groups was synthesized from silanol terminated-PDMS and epoxy and acrylate groups functionalized silane coupling agents, and utilized as the adhesion promoter (AP) to prepare addition-cured liquid silicone rubber that exhibited self-adhesion ability (SA-LSR) with biocompatible thermoplastic polyurethanes (TPU) sheets. The structural characteristics of AP were characterized by Fourier transform infrared (FTIR) spectroscopy, which demonstrated the strong adhesion to polyester-based TPU sheets due to a sufficient amount of acrylate groups, epoxy groups and silanol groups obtained by the hydrolysis of alkoxy groups. In detail, the peel-off strength of SA-LSR and TPU joints reached up to 7.63 N mm−1 after the optimization of adhesion promoter including type and content, and curing condition including time and temperature. The cohesive failure was achieved during the sample breakage process. Moreover, the SA-LSR showed a good storage stability under proper storage conditions. This design strategy provided the feasibility to combine the advantages of addition-cured liquid silicone rubber and plastics with low melting points, promoting the potential application range of those silicone-based materials.
Highlights
The attachment of “organic” groups to the Si–O bond “inorganic” backbone endows silicones with a distinct combination of properties including heat resistance, chemical stability, electrical insulating, abrasion resistance, weatherability and excellent biocompatibility, facilitating a wide range of application of silicones in aerospace, automobile, construction, electronic and electrical, and medical industries, etc. [1,2,3,4]
ECETS armed with highly reactive epoxy groups and MPMDS containing acrylate group, which possessed a relatively similar structure to polyester were selected as functionalized silane coupling agents to synthesize the adhesion promoter
PDMS-OH-2 further indicated that the epoxy groups, alkoxy groups and acrylate groups functionalized adhesion promoter (AP)-2 was successfully synthesized (Table 2), while similar molar-mass dispersity between PDMS-OH-2 and AP-2 manifested that no self-condensation occurred in PDMS-OH or silane coupling agents
Summary
The attachment of “organic” groups to the Si–O bond “inorganic” backbone endows silicones with a distinct combination of properties including heat resistance, chemical stability, electrical insulating, abrasion resistance, weatherability and excellent biocompatibility, facilitating a wide range of application of silicones in aerospace, automobile, construction, electronic and electrical, and medical industries, etc. [1,2,3,4]. II, Inc., Lakeside, AZ, USA) and PU assembly showed pure cohesive failure during T-peel test Both aforementioned surface modification and use of primers can effectively improve the adhesion ability between LSR and various substrates, the two methods have time-consuming and complicated process issues. Self-adhesive liquid silicone rubber (SA-LSR) is attracting extensive attention, which contains functional siloxane oligomers (e.g., epoxy, alkoxy, methacryloxy groups) serving as effective adhesion promoters toward various substrates in the curing process [27,28,29,30]. The LSR/TPU assembly is urgently needed in smart wearable devices and medical beauty fields [7,13] To this end, addition-cured LSR with strong self-adhesion strength towards polyester-based TPU sheet was engineered, in which polydimethylsiloxane functionalized with epoxy, alkoxy and acrylate groups was utilized as the adhesion promoter. The curing and storage conditions of SA-LSR were evaluated in detail
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