蒸汽压渗透法在液体橡胶数均相对分子质量测定中的应用

The application of VPO method in the determination of liquid rubber molecular weight

利用蒸汽压渗透法,用已知相对分子质量的标准样来标定仪器常数K值,分析测定液体橡胶相对分子质量。发现蒸汽压渗透仪仪器常数并不是一个定值,而是随已知相对分子质量呈一定的规律性,即随着标准样品的相对分子质量增大而增大。在此现象上给出了一定的讨论,可能是由于溶质吸附效应引起的系统误差。且在这种情况下,如何测定液体橡胶的数均相对分子质量,给出了一些建议;比较了小试产品和石化产品的数均相对分子质量测定的稳定性,发现小试样品稳定性较差,影响测量结果。最后,给出了一些建议性的展望,可以参照文献上所提到的进行进一步的探究,根据实际情况探究如何消除溶质吸附效应引起的误差。

The article by vapor pressure osmosis,using standard sample to calibrate the molecular weight of the instrument constant K value of determination of molecular weight liquid rubber. Vapor infiltration apparatus constant that is not a fixed value,but with the known molecular weight was a certain regularity,that is,the molecular weight as the standard sample increases. In this paper,this phenomenon is given a certain amount of discussion,may be due to effects caused by solute adsorption system error.And in this case,how to measure the number average molecular weight liquid rubber,given a certain amount of suggestive;relatively small test products and petrochemical products,the number average molecular weight determination of the stability of the samples found in small type less stable,affect the measurement results.Finally, the paper gives some suggestions of outlook,you can refer to the literature referred to for further exploration,according to the actual situation to explore how to eliminate errors caused by solute adsorption effects.