摘要
用４个低分子量有机化合物和６个窄分布聚苯乙烯标样研究了ＶＰＯ法中仪器常数Ｋ的分子量依赖性问题．实验结果表明，由于ＶＰＯ法中存在溶质吸附效应，Ｋ具有分子量依赖性，并随分子量的增加而增大；当扣除在实验中产生的溶质分子吸附效应后，Ｋ无分子量依赖性．
The problem about the molecular weight dependence of the instrumental constant K of vapor pressure osmometry was studied in Knauer VPO apparatus by using four low molecular weight organic compounds and six narrow molecular weight distribution oligometic polystyrene samples with the known average molecular weights. There exists the effect of solute adsorption in VPO, which leads to the result that the instrumental constant K is apparently dependent upon the molecular weight of the solute. The dependence of the K on the molecular weight of the solute was eliminated by modifying a factor of solute adsorption.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第9期1522-1525,共4页
Chemical Journal of Chinese Universities
关键词
气相渗透
数均分子量
仪器常数
吸附效应
分子量
Vapor pressure osmometry, Number average molecular weight, Instrumental constant, Adsorption effect (Ed.: H, L)
