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Hyperbranched urethane acrylate

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The viscosity of the urethane acrylate oligomer is high, which is not conducive to the preparation and construction of the coating, and its application range is limited.
Hyperbranched polymer is a macromolecular substance with a highly branched structure, which is one of the dendrimers. Compared with linear polymers, hyperbranched polymers have no spheroidal structure, which makes them have a lower solution. Viscosity and melt viscosity as well as high activity and solubility.

ZHANG Yong et al. reacted with isophorone diisocyanate (IP-DI) and hydroxyethyl methacrylate (HEMA) to prepare NCO-containing materials, which were combined with partially modified hyperbranched polyester to synthesize hyperbranched urethane acrylate (HPUA). ) as a host resin in a photocurable coating.

Due to the introduction of a flexible ethoxy group between the hyperbranched polyester and the acrylic end groups, the steric effect between the two is reduced, resulting in an increase in the activity of the hyperbranched urethane acrylate.

BAO FenFen et al. synthesized hyperbranched urethane acrylate (HPUA) by the addition of hydroxyl terminated hyperbranched polyurethane (HPU-OH) and semi-addition urethane acrylate (IP-DI-HEA).

The number average molecular weight and polydispersity index were 7714 g/mol and 1.24, respectively, as determined by GPC. The tensile strength and impact strength of HPUA, epoxy acrylate and tripropylene glycol diacrylate (TPGDA) were studied. influences.


In addition, with the addition of HPUA, the elongation at break increased continuously, and the elongation at break of EB70HPUA30 film reached 130%.


Xu Chaohua et al. synthesized nucleated hyperbranched polyurethane (HBPU-OH) containing 6 terminal hydroxyl groups by using glycerol as the core and isophorone diisocyanate (IPDI) and diethanolamine (DEOA).


The semi-addition product isophorone diisocyanate-hydroxyethyl acrylate (IP-DI-HEA) was modified to prepare HPUA (hyperbranched urethane acrylic resin) with adjustable double bond number, as shown in Fig. 4. It is shown to have a glass transition temperature (Tg) of 67.8 ° C, which is lower than the Tg of HBPUA-OH (110.0 ° C).


Hyperbranched polymer can effectively reduce the viscosity of the polymer, which is beneficial to the preparation and construction of the coating. However, due to its complicated structure, it is not conducive to accurate structural characterization and analysis, which increases the difficulty of research and limits its application.

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