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采用紫外光引发接枝表面改性的方法,以芴酮(FL)为引发剂,在低密度聚乙烯(LDPE)薄膜表面上接枝丙烯酸(AA)、甲基丙烯酸(MAA)、丙烯酸甲酯(MA)、甲基丙烯酸甲酯(MMA)、丙烯酰胺(AM)等单体,以赋予薄膜表面新的化学性质.考察了引发剂浓度、紫外光的辐照时间、辐照强度、单体种类对LDPE薄膜接枝程度的影响.结果表明,在一定范围内,增加芴酮浓度,可以提高单体的接枝率,但当芴酮浓度达到5%时,接枝率反而下降.延长辐照时间至4 min和提高紫外光的辐照强度达100 W/m2,均有利于接枝反应的进行.不同单体在LDPE膜上的接枝能力与单体的活性、单体与基材的相容性等因素有关.接枝后,LDPE与水的接触角下降程度不仅与单体在膜上的接枝量有关,还与接枝单体的亲水性能密切相关.
The method of UV-induced grafting surface modification was used to graft acrylic acid (AA), methacrylic acid (MAA) and methyl acrylate onto the surface of low density polyethylene (LDPE) film with fluorenone (FL) (MA), methyl methacrylate (MMA) and acrylamide (AM) to impart new chemical properties to the surface of the film.The effects of initiator concentration, UV irradiation time, irradiation intensity, The results showed that increasing the concentration of fluorenone could increase the grafting degree of LDPE film, but the graft ratio decreased when the concentration of fluorenone reached 5% The irradiation time of 4 min and the UV irradiation intensity up to 100 W / m2 are conducive to the grafting reaction.The grafting capacity of different monomers on LDPE film and the monomer activity, monomer and substrate Compatibility of the graft copolymer, etc. The degree of decrease of the contact angle between LDPE and water is not only related to the graft amount of the monomer on the film, but also to the hydrophilicity of the grafted monomer.