The water-soluble high molecular weight Poly(sodium styrenesulfonate)(PSS) was prepared from polystyrene and sulfuric acid by suspension and azeotropic distilation methods,and its structure was characterized by chemic...The water-soluble high molecular weight Poly(sodium styrenesulfonate)(PSS) was prepared from polystyrene and sulfuric acid by suspension and azeotropic distilation methods,and its structure was characterized by chemical titration and 1H-NMR;Factors such as reactants ratio,temperature and time affecting the degree of sulfonation of polystyrene were investigated.The results indicated that the sulfonation degree was increased with an increase in the ratio(R) of sulfuric acid/polystyrene and reaction time.By azeotropic distilation method,PSS could be synthesized in the presence of equivalent amount of sulfuric展开更多
采用正交回归旋转组合设计,对吉粳63号栽培上五个主要可控因素进行了研究,结果表明,(1)吉粳63号水稻品种的平均产量效应为每公顷8045公斤,最大产量潜力可达每公顷8960公斤。(2)主要栽培措施对吉粳63号产量作用的大小顺序为插秧苗数>...采用正交回归旋转组合设计,对吉粳63号栽培上五个主要可控因素进行了研究,结果表明,(1)吉粳63号水稻品种的平均产量效应为每公顷8045公斤,最大产量潜力可达每公顷8960公斤。(2)主要栽培措施对吉粳63号产量作用的大小顺序为插秧苗数>插秧期>施 N 量>插秧方式>播种期。(3)预测公顷产量在8000公斤以上时,主要栽培因素应采用的数量为:播种期4月16～4月17日,插秧期5月21～5月22日,施 N 量172～178公斤/公顷,插秧方式26.7×13.3cm,插秧苗数4～5.4个/穴。(4)如果不考虑播种期和插秧期这两个因素,取得最佳经济效益时的栽培措施为每公顷施氮量156公斤,插秧方式26.7×10cm,每穴插秧3苗。展开更多
文摘The water-soluble high molecular weight Poly(sodium styrenesulfonate)(PSS) was prepared from polystyrene and sulfuric acid by suspension and azeotropic distilation methods,and its structure was characterized by chemical titration and 1H-NMR;Factors such as reactants ratio,temperature and time affecting the degree of sulfonation of polystyrene were investigated.The results indicated that the sulfonation degree was increased with an increase in the ratio(R) of sulfuric acid/polystyrene and reaction time.By azeotropic distilation method,PSS could be synthesized in the presence of equivalent amount of sulfuric
文摘采用正交回归旋转组合设计,对吉粳63号栽培上五个主要可控因素进行了研究,结果表明,(1)吉粳63号水稻品种的平均产量效应为每公顷8045公斤,最大产量潜力可达每公顷8960公斤。(2)主要栽培措施对吉粳63号产量作用的大小顺序为插秧苗数>插秧期>施 N 量>插秧方式>播种期。(3)预测公顷产量在8000公斤以上时,主要栽培因素应采用的数量为:播种期4月16～4月17日,插秧期5月21～5月22日,施 N 量172～178公斤/公顷,插秧方式26.7×13.3cm,插秧苗数4～5.4个/穴。(4)如果不考虑播种期和插秧期这两个因素,取得最佳经济效益时的栽培措施为每公顷施氮量156公斤,插秧方式26.7×10cm,每穴插秧3苗。
