CAJ | 학술논문

丙烯酸丁酯(BA)、甲基丙烯酸甲酯(MMA)、甲基丙烯酸(MAA)和甲基丙烯酸羟乙酯(HEMA)为共聚单体合成了具有软核硬壳结构的丙烯酸酯乳液,经喷雾干燥法制得了丙烯酸酯可再分散乳胶粉.通过测试再分散液粒径及其分布、吸光度表征了乳胶粉再分散性及再分散液稳定性,并用扫描电镜(SEM)观察了再分散液的微观成膜效果,最后用傅立叶红外光谱(FT-IR)、透射电镜(TEM)、差示扫描量热(DSC)等测试对乳胶粉进行了表征.实验结果表明,制备的乳胶粉具有良好的再分散稳定性,再分散液和原乳液粒径大小及其分布基本相同,SEM显示再分散液具有良好的成膜性,FT-IR表明乳胶粉的分子结构与原乳液相比未发生明显改变,TEM显示再分散液粒子未发生变化仍保持核壳结构,DSC验证了制得的乳胶粉具有核(25℃和壳55℃两个玻璃化温度(T_g).所有分析表明乳胶粉再分散液与原乳液的性能和结构基本相同.
병희산정지(BA)、갑기병희산갑지(MMA)、갑기병희산(MAA)화갑기병희산간을지(HEMA)위공취단체합성료구유연핵경각결구적병희산지유액,경분무간조법제득료병희산지가재분산유효분.통과측시재분산액립경급기분포、흡광도표정료유효분재분산성급재분산액은정성,병용소묘전경(SEM)관찰료재분산액적미관성막효과,최후용부립협홍외광보(FT-IR)、투사전경(TEM)、차시소묘량열(DSC)등측시대유효분진행료표정.실험결과표명,제비적유효분구유량호적재분산은정성,재분산액화원유액립경대소급기분포기본상동,SEM현시재분산액구유량호적성막성,FT-IR표명유효분적분자결구여원유액상비미발생명현개변,TEM현시재분산액입자미발생변화잉보지핵각결구,DSC험증료제득적유효분구유핵(25℃화각55℃량개파리화온도(T_g).소유분석표명유효분재분산액여원유액적성능화결구기본상동.
The acrylate emulsion of particles with the structure of soft core and hard shell was synthesized by emulsion polymerization with BA, MMA, MAA and HEMA as co-monomers, and the acrylate redispersible polymer powder was prepared by spray drying of the prepared emulsion. The redispersibility of the powder and stability of the reconstituted emulsion were characterized by measuring the particle size and its distribution and the absorbance of the reconstituted emulsion. The film formed by the reconstituted emulsion was observed with Scanning Electron Microscope (SEM), and the prepared powder was characterized by Fourier Transmission Infrared Ray (FT-IR), Transmission Electron Microscope (TEM) and Differential Scanning Colorimeter (DSC), respectively. The experimental results show that the powder prepared has good redispersibility, the particle size and its distribution in reconstituted emulsion is similar to that in the original emulsion;SEM photographs show that the reconstituted emulsion has good ability of film-forming;the FT-IR spectra indicate that the molecular structure of the powder has no evident change from that of the particles in the original emulsion;TEM photographs indicated that, in the reconstituted emulsion, the particle structure has no change and still keeps its core-shell structure;the DSC pattern verifies that the powder has two glass transition temperatures (T_g), the Tg of core and shell are (25℃ and 55℃, respectively. All the analysis shows that the performance and structure of the reconstituted emulsion are similar to the original emulsion.