In this study,composite films consisting of polylactic acid(PLA),ethyl cellulose(EC),and zein were prepared by solution casting method,and their performance and application in chilled fresh meat preservation were inve...In this study,composite films consisting of polylactic acid(PLA),ethyl cellulose(EC),and zein were prepared by solution casting method,and their performance and application in chilled fresh meat preservation were investigated.The results showed that the three materials had satisfactory compatibility in the composite film.Addition of EC and zein effectively improved the mechanical properties,thermodynamic properties,surface hydrophilicity,oxygen permeability,and degradation properties of PLA films.When the ratio of PLA to EC was 3:7,the tensile strength and elongation at break reached maximum values of 16.6 MPa and 30.5%,respectively.Moreover,under different conditions,the composite film exhibited better degradability than the PLA film.The composite film with a 3:7 ratio of PLA to EC had the best performance,with a degradation rate of 21.75%after 84 days.Chilled fresh meat wrapped with the composite film showed significantly improved antioxidant,antibacterial,and water-holding properties.展开更多
分析10%乙羧氟草醚EC对大豆田阔叶杂草的防除效果和最佳使用剂量,对其进行了田间药效试验。结果表明,10%乙羧氟草醚EC 300~1 200 m L/hm2处理,药后40 d对大豆田阔叶杂草的株防效达91.49%~99.87%,鲜重防效达95.65%~99.94%,可较好地控制...分析10%乙羧氟草醚EC对大豆田阔叶杂草的防除效果和最佳使用剂量,对其进行了田间药效试验。结果表明,10%乙羧氟草醚EC 300~1 200 m L/hm2处理,药后40 d对大豆田阔叶杂草的株防效达91.49%~99.87%,鲜重防效达95.65%~99.94%,可较好地控制大豆田野苋菜、马齿苋的为害,在杂草3~5叶期使用,用量以600~900 m L/hm2为宜。展开更多
Ethyl cellulose(EC)/cellulose acetate(CA) blends were prepared by solution blending. The (thermal) stability of the blends was observed by TG, and the compatibility of them was also studied by visco-(metry), refractiv...Ethyl cellulose(EC)/cellulose acetate(CA) blends were prepared by solution blending. The (thermal) stability of the blends was observed by TG, and the compatibility of them was also studied by visco-(metry), refractive index, DSC and IR. The results show that the (refractive) index or the trait vicidity of the EC/CA solution is linearly dependent on the mass composition of the blend. At 50 and 0.01 g/mL concentration, EC and CA are almost completely miscible. A single T_g was observed for a series of blends, which was in between the T_g of pure EC and that of pure CA. The decomposition temperature of the EC/CA blend decreased with the increase of EC mass fraction in the blends. These results indicate that there is good compatibility (between) EC and CA, and the thermal stability of the blends is improved compared to that of pure EC.展开更多
为明确17.5%精喹禾灵EC对大豆田禾本科杂草的防除效果及其使用的安全性,在田间设17.5%精喹禾灵EC每公顷26.25、39.375、52.5、78.75 g 4个处理,以5%精喹禾灵EC 45 g/hm^2为对照药剂,以人工锄草和清水喷雾为对照。结果表明,17.5%精喹禾...为明确17.5%精喹禾灵EC对大豆田禾本科杂草的防除效果及其使用的安全性,在田间设17.5%精喹禾灵EC每公顷26.25、39.375、52.5、78.75 g 4个处理,以5%精喹禾灵EC 45 g/hm^2为对照药剂,以人工锄草和清水喷雾为对照。结果表明,17.5%精喹禾灵EC对大豆田马唐、稗草具有很好的防效,可以在生产上推广使用。展开更多
文摘In this study,composite films consisting of polylactic acid(PLA),ethyl cellulose(EC),and zein were prepared by solution casting method,and their performance and application in chilled fresh meat preservation were investigated.The results showed that the three materials had satisfactory compatibility in the composite film.Addition of EC and zein effectively improved the mechanical properties,thermodynamic properties,surface hydrophilicity,oxygen permeability,and degradation properties of PLA films.When the ratio of PLA to EC was 3:7,the tensile strength and elongation at break reached maximum values of 16.6 MPa and 30.5%,respectively.Moreover,under different conditions,the composite film exhibited better degradability than the PLA film.The composite film with a 3:7 ratio of PLA to EC had the best performance,with a degradation rate of 21.75%after 84 days.Chilled fresh meat wrapped with the composite film showed significantly improved antioxidant,antibacterial,and water-holding properties.
文摘分析10%乙羧氟草醚EC对大豆田阔叶杂草的防除效果和最佳使用剂量,对其进行了田间药效试验。结果表明,10%乙羧氟草醚EC 300~1 200 m L/hm2处理,药后40 d对大豆田阔叶杂草的株防效达91.49%~99.87%,鲜重防效达95.65%~99.94%,可较好地控制大豆田野苋菜、马齿苋的为害,在杂草3~5叶期使用,用量以600~900 m L/hm2为宜。
文摘Ethyl cellulose(EC)/cellulose acetate(CA) blends were prepared by solution blending. The (thermal) stability of the blends was observed by TG, and the compatibility of them was also studied by visco-(metry), refractive index, DSC and IR. The results show that the (refractive) index or the trait vicidity of the EC/CA solution is linearly dependent on the mass composition of the blend. At 50 and 0.01 g/mL concentration, EC and CA are almost completely miscible. A single T_g was observed for a series of blends, which was in between the T_g of pure EC and that of pure CA. The decomposition temperature of the EC/CA blend decreased with the increase of EC mass fraction in the blends. These results indicate that there is good compatibility (between) EC and CA, and the thermal stability of the blends is improved compared to that of pure EC.
文摘为明确17.5%精喹禾灵EC对大豆田禾本科杂草的防除效果及其使用的安全性,在田间设17.5%精喹禾灵EC每公顷26.25、39.375、52.5、78.75 g 4个处理,以5%精喹禾灵EC 45 g/hm^2为对照药剂,以人工锄草和清水喷雾为对照。结果表明,17.5%精喹禾灵EC对大豆田马唐、稗草具有很好的防效,可以在生产上推广使用。
