Preparation and performance study of multiple hydrogen bonds-based self-healing optical adhesive
Under the rapid development trend of consumer electronics and 5G communication,the demand for OCA optical adhesive in the field of optoelectronics continues to increase.However,during the use or processing of OCA optical adhesive,the problem of deterioration of material properties due to material defects often occurs,even further leading to the scrapping of materials,which makes OCA optical adhesive with self-healing ability show great market potential.In this paper,2-ureido-4[1H]-pyrimidinone methacrylate(UPyMA)monomer containing quadruple hydrogen bonds was prepared,and UPyMA with mass fractions of 5％,10％,15％,and 20％was introduced into a copolymer system of polyurethane acrylate,2-ethylhexylacrylate and isobornyl acrylate,respectively.A series of OCA optical adhesives with self-healing function were prepared by UV induced polymerization,with 2-hydroxy-2-methylphenylpropane-1-ketone as the photoinitiator and γ-glycidoxypropyltrimethoxysilane as the tackifier agent.Their structures,light transmittance,rheological properties,tensile properties,and self-healing properties were measured or characterized.The research results showed that,(1)UPyMA and a series of OCA optical adhesives with self-healing function were successfully prepared.(2)All OCA optical adhesives did not produce bubbles or crystal dots,and their haze was all less than 0.50,which could meet the demand for OCA optical adhesives in the field of touch display products.(3)The 180° peel strength of OCA optical adhesives with different mass fractions(0-20％)of UPyMA was tested on stainless steel plates.When the UPyMA content was 15％,the bonding power was the highest(25.5 N).(4)The temperature dependence of storage modulus(G')and loss modulus(G")of OCA optical adhesives with different contents of UPyMA was analyzed.All OCA optical adhesives had good flowability and interfacial wetting properties at room temperature,which endowed OCA optical adhesives with good bonding properties.(5)The self-healing efficiency was significantly improved after adding UPyMA,providing favorable conditions for extending the service life of the material.(6)The high-temperature and high humidity aging resistance test showed that the prepared products could meet the application requirements,indicating that they had good aging resistance under high-temperature and high humidity conditions.
OCA optical adhesiveUPyMA monomerUV induced polymerizationself-healing
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