UV‐curable polyurethane acrylate resin containing multiple active terminal groups for enhanced mechanical properties

Abstract

In this article, aiming to develop the high performance ultraviolet (UV)-curable resin used in the polymer matrix composite, a series of polyurethane acrylate (PUA) resins with the different numbers of allyl terminal groups were elaborately designed and synthesized, in which the contents of hard segments and soft segments were also adjusted simultaneously. The effects of allyl number on properties of PUA were systemically investigated. It was found that allyl number had the negligible effect on the processability as well as positive effect on thermal performances, and all PUA resins exhibited the low viscosity and rapid UV polymerization. Besides, with the change of allyl number in the range of 2-4, PUA resin casting with three allyls possessed the preferable mechanical properties such as 85.1 MPa tensile strength, 3.94 GPa tensile modulus, and 20.7 kJ m −2 impact strength. More importantly, the high strength and high modulus of the composite further demonstrated the wide potentials of the as-prepared PUA resin as the ideal resin matrix candidate for the fiber reinforced polymer composites.

Preparation and Properties of Plant-Oil-Based Epoxy Acrylate-Like Resins for UV-Curable Coatings

“…These variations can be attributed to the increase of cross-link density. As we know, an increase in cross-link density usually results in the improvement of stiffness and decrease of flexibility and toughness, and vice versa [ 30 , 51 ]. In addition, as the HEMA diluent content increased from 0 to 30%, the values of σ , E, and ε improved remarkably.…”

Influence of Block Copolymer Concentration and Resin Crosslink Density on the Properties of UV‐Curable Methacrylate Resin Systems

“…The interaction of a large number of components and different UV-curing conditions, as well as the fact that most UV-curing systems are still only used for coatings and thin films, often makes mechanical characterization and evaluation very complex. For a deeper insight, we refer to other publications [52][53][54][55] and focus on the influence of the BCP toughener on the mechanical properties. Since toughening of brittle polymers is often accompanied by an undesirable loss of stiffness and strength, three-point bending tests were carried out to determine the effect of varying BCP content on flexural modulus and strength.…”

Zirconia/phenylsiloxane nano-composite for LED encapsulation with high and stable light extraction efficiency

“…A lot of efforts have been made to increase the RI of silicone materials [3][4][5][6] and their gas barrier properties [7][8][9][10][11] to enhance the light extraction efficiency (LEE) value and stability.…”

“…On the other hand, because of the extreme flexibility of silicone chains, their gas or vapor permeation is quite high and is harmful to the inner metal components and leads to quick decline or even extinction of the light. A lot of efforts have been made to increase the RI of silicone materials 3–6 and their gas barrier properties 7–11 to enhance the light extraction efficiency (LEE) value and stability.…”