聚丙烯微孔膜的等离子接枝

Plasma grafting of microporous polyproyrene membrane

在新型聚丙烯微孔膜上低温等离子接枝饱和的非离子型表面活性剂,使对水的接触角由108°降低到48°。提出了自由基接枝机理。研究了接枝过程主要参数对接枝率的影响,证实了存在接枝和刻蚀竞争机制。

A new type microporous polypropyrene membrana made by biaxial drawing of predominanly β-crystalline phase polypropylene was used for surface grafiting matrix by plasma treatment. Pore size distribution of the membrane have been determined. The grafting of saturated non-ionic surfactants to the membrane is accomplished in a low temperature plasma equipment with pressure 13.0 Pa, N_2 atmosphere and frequency 13.56 MH_2. The groups grafted on the membrane are characterized by IR and XPS. The free radical mechanism of plasma grafting is proposed on the basis of ESR study. The influence of main parameters (plasma treating time, monomer concentration) discharge voltage) on the extent of grafting has been studied. The competition between grafting and etching effects during the plasma treating process is verified.The surface contact angle of polypropyrence membranes toward water is decreased form 108° before grafting to 48° after grafting. The grafted microporous membranes of PP possess good bydrophilicity.