TY - JOUR
T1 - Synthesis and properties of UV-curable hyperbranched polyester
AU - Zhang, Linya
AU - Jiao, Qingze
AU - Zhao, Yun
AU - Zhou, Mingji
AU - Feng, Wei
AU - Ge, Yanrui
PY - 2011/9/14
Y1 - 2011/9/14
N2 - Using the molten polycondensation, the second to fourth generation of hyperbranched polyesters with a great number of hydroxyl groups were synthesized and characterized based on the pentaerythritol as core and 2, 2-bis(hydroxymethyl) propionic acid as arm. They had high branched degrees, low viscosity and good thermal stability. By methacryloyl anhydride, the hyperbranched polyesters were modified to be the hyperbranched methacrylates with C=C at the chain ends. The percent conversion could be reached above 89% under the optimum reaction conditions. The modified hyperbranched polyesters exhibited lower viscosity, two segmental thermogravimetric curve and lower glass transition temperature (Tg). When the hyperbranched methacrylates with low viscosity were applied in UV-curable coating for metals, it could take less solvent, fast coating speed and complete curing. The effects which the hyperbranched polyesters with different C=C contents took on the properties of UV-curable coating such as gel content, adhesive strength, impact strength, flexibility, hardness and the solvent resistances were studied. With the improvement of C=C contents, the gel contents were increased. Also the mechanical properties and solvent resistances of coatings were changed significantly. The experiments exhibited that it would help to gain the perfect UV-curable materials by choosing the hyperbranched polyesters with different contents of active groups.
AB - Using the molten polycondensation, the second to fourth generation of hyperbranched polyesters with a great number of hydroxyl groups were synthesized and characterized based on the pentaerythritol as core and 2, 2-bis(hydroxymethyl) propionic acid as arm. They had high branched degrees, low viscosity and good thermal stability. By methacryloyl anhydride, the hyperbranched polyesters were modified to be the hyperbranched methacrylates with C=C at the chain ends. The percent conversion could be reached above 89% under the optimum reaction conditions. The modified hyperbranched polyesters exhibited lower viscosity, two segmental thermogravimetric curve and lower glass transition temperature (Tg). When the hyperbranched methacrylates with low viscosity were applied in UV-curable coating for metals, it could take less solvent, fast coating speed and complete curing. The effects which the hyperbranched polyesters with different C=C contents took on the properties of UV-curable coating such as gel content, adhesive strength, impact strength, flexibility, hardness and the solvent resistances were studied. With the improvement of C=C contents, the gel contents were increased. Also the mechanical properties and solvent resistances of coatings were changed significantly. The experiments exhibited that it would help to gain the perfect UV-curable materials by choosing the hyperbranched polyesters with different contents of active groups.
KW - Coating
KW - Hyperbranched polyester
KW - Methacryloyl anhydride
KW - Modified
KW - UV-curable
UR - http://www.scopus.com/inward/record.url?scp=84881255460&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:84881255460
SN - 0567-7351
VL - 69
SP - 2031
EP - 2038
JO - Acta Chimica Sinica
JF - Acta Chimica Sinica
IS - 17
ER -