Membranes of Polyurethanes Containing Crystalline Soft Segments:Oxygen Permeability and Morphology

Bulletin of the Korean chemical society

Hyo-Jin Oh¹  Wan-Young Kim¹  Youn-Sik Lee¹  Yong-Seob Jeong¹ 

关键词: Membranes;    PU;    CPVC;    PEG;    PBS;    Oxygen permeability.;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

In order to look for polymeric materials applicable to the oxygen electrode membranes of biosensors, polyurethanes (PUs) were synthesized from poly(butylene succinate) diol (M_n 1150), poly(ethylene glycol) (M_n 200), and 4,4`-methylenebis(cyclohexyl isocyanate). The PUs (Mn 15000-100000) underwent the crystallization and melting transitions in the temperature range of 20-30 �? and 90-110 �?, respectively. The oxygen permeability for the PU membranes prepared by the solution casting method could not be measured since oxygen simply leaked through the membranes with an audible noise. However, when the PUs were blended with carboxylated poly(vinyl chloride) (CPVC), the permeability could be measured. The oxygen permeability coefficient (Po₂) of the PU/CPVC (96/4) membranes (6.4 Barrer) was high enough for the application as the electrode membranes. The Po₂ decreased dramatically when the CPVC content increased from 4 to 5 wt%, but decreased very slowly and approached to that of CPVC (~0.26 Barrer) when the CPVC content increased further. The scanning electron micrographs of the membranes revealed that the PU membranes were composed of large crystal grains with many pores, but the size of the PU crystal grains and pores decreased progressively with increasing the CPVC content.

【 授权许可】

Unknown