聚丙烯微孔膜表面的可控接枝改性

Modification of polypropylene microporous membrane by surface-initiated controlled grafting method

通过可逆加成-裂解链转移(RAFT)的方法,在UV辐射下对聚丙烯微孔膜(PPMM)进行功能化改性,制备了PPMM-PAA-PAAm膜,考察了辐射时间、链转移剂浓度对光接枝反应的影响,并用衰减全反射红外光谱(FT-IR/ATR)进行了表征.结果表明,随辐射时间的延长和转移剂浓度的下降接枝率呈线性上升;加入0.167～0.835mmol/L三硫代酯(DBTTC)时,随辐射时间的增加接枝率呈线性上升,但是加了DBTTC时相比没加DBTTC时接枝率明显下降.

The functionalization of polypropylene microporous membrane was carried out by the reversible additionfragmentation chain transfer method under UV irradiation, and the polypropylene microporous membrane with block grafting chain of poly（acrylic acid） and polyacrylamide was prepared. The effect of UV irradiation time, chain transfer agent concentration on the grafting process was investigated, and the surface chemical changes was characterized by attenuated total reflection-Fourier transform infrared spectroscopy （ATR/FI- IR）. The resuhs showed that the degree of grafting increased with the increase of UV irradiation time and the decrease of the chain transfer agent concentration linearly. With the addition of dibenzyhrithiocarbonate （DBTrC） of 0.167-0.835 mmol/L, the degree of grafting increased linearly, however, the degree of grafting reduced greatly after the addition of DBTYC compared with the normal process without the addition of DBTrC.