The UP PER UP blocked copolymer was prepared by the reaction of unsaturated polyester(UP)and polyepoxy resin(PER)under suitable conditions. The modified photosensitive resin was formed after the addition of the active...The UP PER UP blocked copolymer was prepared by the reaction of unsaturated polyester(UP)and polyepoxy resin(PER)under suitable conditions. The modified photosensitive resin was formed after the addition of the active monomers into the copolymer. The UV cured process of the resin was investigated by means of FTIR spectrum and the properties of the UV cured coat were characterized in terms of TG/DTA and other analysis. The results indicated that the UV cured resin showed the advantages of both unsaturated polyester resin and polyepoxy resin. The base resistant ability, thermostability and surface hardness of the resin were greatly improved. The volume shrinkage of the sample was lowered from 7% to 0.8% and the adhesion power on substrate was increased. Thus the applications of unsaturated polyester resin were widely promoted.展开更多
An acrylic monomer bearing carbazole moiety,3 methacrylamido 9 ethylcarbazole (MAECz)was synthesized and polymerized radically.Fluorescence studies showed that at the same chromophore concentration,the fluorescence in...An acrylic monomer bearing carbazole moiety,3 methacrylamido 9 ethylcarbazole (MAECz)was synthesized and polymerized radically.Fluorescence studies showed that at the same chromophore concentration,the fluorescence intensity of the polymer (P(MAECz) was much stronger than that of the monomer.This can be explained by what we termed fluorescence “Structural Self Quenching Effect”(SSQE).The stern volmer constants of P(MAECz) in solution quenched by several electron deficient vinyl monomers were obtained.It was found that the quenching efficiency of the quenchers was relevant to the degree of the electron deficiency.Also,the photopolymerization of acrylonitrile (AN) initiated by MAECz was investigated kinetically and a tentative initiation mechanism was proposed.展开更多
The fluoro-polyester resins(F-UPR ) were synthesized from tetrafluoro- o -phthahic acid, maleic acid and propanediol in order to introduce the fluorine atom into the unsaturated polyester resin(UPR) chains and improve...The fluoro-polyester resins(F-UPR ) were synthesized from tetrafluoro- o -phthahic acid, maleic acid and propanediol in order to introduce the fluorine atom into the unsaturated polyester resin(UPR) chains and improve their properties. The result indicated that the product has viscosity 0 21 Pa·s (25 ℃), about half of that of the common unsaturated polyester resins (0 39 Pa·s, 25 ℃) and the contact angle between water and cured F-UPR was 64°. The water-resistant ability and acid-resistant ability of the resin were improved. The spectral and thermo-stability test results of the F-UPR showed that the UV-curing process of F-UPR could be completed within 40 min and the total mass loss of UV-cured F-UPR was 94 6% with thermodestruction temperature being 373 ℃.展开更多
文摘The UP PER UP blocked copolymer was prepared by the reaction of unsaturated polyester(UP)and polyepoxy resin(PER)under suitable conditions. The modified photosensitive resin was formed after the addition of the active monomers into the copolymer. The UV cured process of the resin was investigated by means of FTIR spectrum and the properties of the UV cured coat were characterized in terms of TG/DTA and other analysis. The results indicated that the UV cured resin showed the advantages of both unsaturated polyester resin and polyepoxy resin. The base resistant ability, thermostability and surface hardness of the resin were greatly improved. The volume shrinkage of the sample was lowered from 7% to 0.8% and the adhesion power on substrate was increased. Thus the applications of unsaturated polyester resin were widely promoted.
文摘An acrylic monomer bearing carbazole moiety,3 methacrylamido 9 ethylcarbazole (MAECz)was synthesized and polymerized radically.Fluorescence studies showed that at the same chromophore concentration,the fluorescence intensity of the polymer (P(MAECz) was much stronger than that of the monomer.This can be explained by what we termed fluorescence “Structural Self Quenching Effect”(SSQE).The stern volmer constants of P(MAECz) in solution quenched by several electron deficient vinyl monomers were obtained.It was found that the quenching efficiency of the quenchers was relevant to the degree of the electron deficiency.Also,the photopolymerization of acrylonitrile (AN) initiated by MAECz was investigated kinetically and a tentative initiation mechanism was proposed.
文摘The fluoro-polyester resins(F-UPR ) were synthesized from tetrafluoro- o -phthahic acid, maleic acid and propanediol in order to introduce the fluorine atom into the unsaturated polyester resin(UPR) chains and improve their properties. The result indicated that the product has viscosity 0 21 Pa·s (25 ℃), about half of that of the common unsaturated polyester resins (0 39 Pa·s, 25 ℃) and the contact angle between water and cured F-UPR was 64°. The water-resistant ability and acid-resistant ability of the resin were improved. The spectral and thermo-stability test results of the F-UPR showed that the UV-curing process of F-UPR could be completed within 40 min and the total mass loss of UV-cured F-UPR was 94 6% with thermodestruction temperature being 373 ℃.
