聚氨酯表面ATRP接枝甲基丙烯酸二甲胺基乙酯

通过与2-溴代异丁酰溴(BiB)反应，在臭氧(O₃)处理过的聚氨酯(PU)表面引入α碳上带酯基的烷基溴代物；在此基础上引发原子转移自由基聚合(ATRP)，制备聚甲基丙烯酸二甲胺基乙酯(PDMAEMA)。采用水接触角、X射线光电子能谱(XPS)、全反射红外光谱(ATR-FTIR)、凝胶渗透色谱(GPC)等表征测试手段对PU表面处理和接枝过程进行了研究。结果表明：O₃处理23min时，PU薄膜表面亲水性最好；在PU薄膜表面成功接枝上PDMAEMA分子链，分子量及其分布(PDI)分别为4.85×10⁴和2.095。

Preparation and characterization of poly(2-(dimethylamino)ethyl methacrylate)grafted on the surface of polyurethane films via atom transfer radical polymerization

Polyurethane (PU) films have been hydroxylated by ozone and chemical reduction, and then grafted with 2-bromoisobutyryl bromide as the initiator for the atom transfer radical polymerization (ATRP) of 2-(dimethylamino)ethyl methacrylate (DMAEMA). The elemental composition and chemical structure of the films were characterized by water contact angle measurements, X-ray photoelectron spectroscopy (XPS) and attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy. The molecular weight and polydispersities (PDI) of the polymer chains were determined by gel permeation chromatography (GPC). The results showed that the PU film had the most effective hydrophilic surface after treatment with ozone for 23 min, with the molecular weight and PDI of the resulting polyDMAEMA being 4.85×10⁴ and 2.095, respectively.