Nanosize styrene-acrylate micro-emulsion was synthesized using semi-continuous seed emulsion polymerization method,with hard monomers of styrene and methyl methacryiate,soft monomer of n-buty1 acryiate,function monome...Nanosize styrene-acrylate micro-emulsion was synthesized using semi-continuous seed emulsion polymerization method,with hard monomers of styrene and methyl methacryiate,soft monomer of n-buty1 acryiate,function monomers of acrylic,α-methyl acrylic acid and N-methyloacry amide,complex emulsifier of SDS and OP-10.The structure of the copolymer was characterized by IR and TEM.The influence of the main factors such as ratio of soft and hard monomers,function monomers,and ratio of an-ionic and non-ionicemulsifiers on properties of emulsion was investigated.The optimal emulsion polymerization conditions were determined.展开更多
在水温(23±1)℃条件下研究饥饿对斑鳜(Siniperca scherzeri)仔鱼生长、形态和行为的影响,确定其初次摄食饥饿不可逆点(the point of no return, PNR)和初次投喂最佳时间.结果表明:斑鳜仔鱼孵化后3 日龄开始摄食外源食物,进...在水温(23±1)℃条件下研究饥饿对斑鳜(Siniperca scherzeri)仔鱼生长、形态和行为的影响,确定其初次摄食饥饿不可逆点(the point of no return, PNR)和初次投喂最佳时间.结果表明:斑鳜仔鱼孵化后3 日龄开始摄食外源食物,进入混合营养期;7 日龄油球吸收完毕,进入外源营养期,混合营养期仅4 d.饥饿状态下,仔鱼生长与卵黄囊吸收密切相关,全长基本维持恒定,4 日龄出现自残现象,但仔鱼身体发黑、头大身瘦、后脑部下陷;集群性、初次摄食率与饥饿时间呈负相关;初次摄食时间在3 日龄,仅为5%,高峰期出现在6 日龄(油球即将完全吸收),可达85%,PNR 期为7~8 日龄;仔鱼具有初次摄食能力的时间为4~5 d,仔鱼初次摄食最佳投喂时间在5 日龄左右.展开更多
文摘Nanosize styrene-acrylate micro-emulsion was synthesized using semi-continuous seed emulsion polymerization method,with hard monomers of styrene and methyl methacryiate,soft monomer of n-buty1 acryiate,function monomers of acrylic,α-methyl acrylic acid and N-methyloacry amide,complex emulsifier of SDS and OP-10.The structure of the copolymer was characterized by IR and TEM.The influence of the main factors such as ratio of soft and hard monomers,function monomers,and ratio of an-ionic and non-ionicemulsifiers on properties of emulsion was investigated.The optimal emulsion polymerization conditions were determined.