Abstract
By using one-step molten polycondensation, hyperbranched polyester (HBPE) with 16 terminal hydroxyl groups is synthesized with pentaerythritol as core and 2, 2-bis(hydroxymethyl) propionic acid as arm.A series of hyperbranched polyurethane acrylates (HBPUA) that contains different numbers of C=C at chain end are successfully prepared through further modifying the synthesized HBPE with the semi-addition product of isophorone diisocyanate and hydroxy-ethyl acrylate.The conversion of NCO group reaches 97.8%, and the synthesized HBPUA exhibits low viscosity and good thermal stability.UV-curing behaviors of HBPUA coatings and the mechanical properties of cured films are investigated. It is indicated that higher dosage and modification degree of HBPUA can shorten the curing time of HBPUA coatings, improve the conversion of C=C and the hardness of cured films, while the flexibility and impact strength decrease.If the content of HBPUA exceeds 60wt.%, the coatings cure rapidly, C=C conversion surpasses 90% and the cured films show excellent overall properties.
| Translated title of the contribution | Synthesis of hyperbranched polyurethane acrylate and properties of its UV-cured films |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 181-185 and 191 |
| Journal | Xiandai Huagong/Modern Chemical Industry |
| Volume | 41 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 20 Jun 2021 |