Vegetable oil is one of the most promising renewable feedstocks as an alternative to fossil resources,but there are few studies aiming to transform it into hydrophilic materials.We proposed a facile method to prepare ...Vegetable oil is one of the most promising renewable feedstocks as an alternative to fossil resources,but there are few studies aiming to transform it into hydrophilic materials.We proposed a facile method to prepare water-soluble derivatives from soybean oil,which could become water resistant again after simple heat treatment.The model vegetable oil,soybean oil(SO),was first reacted with maleic anhydride(MA)by the Alder ene reaction to obtain maleinized soybean oil(SOMA),and SOMA was further reacted with gaseous ammonia to obtain the maleamic acid form(SOMA-Amic acid),which was very soluble in water(solubility>100 mg/mL).The obtained water-soluble product was converted to the water-resistant maleimide form(SOMA-Imide)by a simple heat treatment.The potential application of these vegetable oil derived materials was demonstrated in paper sizing as an example.SOMA-Amic acid was demonstrated to be a novel green material,which can be used in an aqueous process and then heat-treated to become water-resistant in the final product.展开更多
Poly(lactic acid)(PLA)is one of the most important bio-plastics,and chemical modification of the already-polymerized poly(lactic acid)chains may enable optimization of its material properties and expand its applicatio...Poly(lactic acid)(PLA)is one of the most important bio-plastics,and chemical modification of the already-polymerized poly(lactic acid)chains may enable optimization of its material properties and expand its application areas.In this study,we demonstrated that poly(lactic acid)can be readily dissolved in acrylic acid at room temperature,and acrylic acid can be graft-polymerized onto poly(lactic acid)chains in solution with the help of photoinitiator benzophenone under 254 nm ultraviolet(UV)irradiation.Similar photo-grafting polymerization of acrylic acid(PAA)has only been studied before in the surface modification of polymer films.The graft ratio could be controlled by various reaction parameters,including irradiation time,benzophenone content,and monomer/polymer ratios.This photo-grafting reaction resulted in high graft ratio(graft ratio PAA/PLA up to 180%)without formation of homopolymers of acrylic acid.When the PAA/PLA graft ratio was higher than 100%,the resulting PLA-g-PAA polymer was found dispersible in water.The pros and cons of the photo-grafting reaction were also discussed.展开更多
基金financially supported by an internal fund from Tsinghua University.
文摘Vegetable oil is one of the most promising renewable feedstocks as an alternative to fossil resources,but there are few studies aiming to transform it into hydrophilic materials.We proposed a facile method to prepare water-soluble derivatives from soybean oil,which could become water resistant again after simple heat treatment.The model vegetable oil,soybean oil(SO),was first reacted with maleic anhydride(MA)by the Alder ene reaction to obtain maleinized soybean oil(SOMA),and SOMA was further reacted with gaseous ammonia to obtain the maleamic acid form(SOMA-Amic acid),which was very soluble in water(solubility>100 mg/mL).The obtained water-soluble product was converted to the water-resistant maleimide form(SOMA-Imide)by a simple heat treatment.The potential application of these vegetable oil derived materials was demonstrated in paper sizing as an example.SOMA-Amic acid was demonstrated to be a novel green material,which can be used in an aqueous process and then heat-treated to become water-resistant in the final product.
基金financially supported by the National Natural Science Foundation of China (No. 21434008)
文摘Poly(lactic acid)(PLA)is one of the most important bio-plastics,and chemical modification of the already-polymerized poly(lactic acid)chains may enable optimization of its material properties and expand its application areas.In this study,we demonstrated that poly(lactic acid)can be readily dissolved in acrylic acid at room temperature,and acrylic acid can be graft-polymerized onto poly(lactic acid)chains in solution with the help of photoinitiator benzophenone under 254 nm ultraviolet(UV)irradiation.Similar photo-grafting polymerization of acrylic acid(PAA)has only been studied before in the surface modification of polymer films.The graft ratio could be controlled by various reaction parameters,including irradiation time,benzophenone content,and monomer/polymer ratios.This photo-grafting reaction resulted in high graft ratio(graft ratio PAA/PLA up to 180%)without formation of homopolymers of acrylic acid.When the PAA/PLA graft ratio was higher than 100%,the resulting PLA-g-PAA polymer was found dispersible in water.The pros and cons of the photo-grafting reaction were also discussed.
