通过辐射诱导接枝方法在聚对苯二甲酸乙二醇酯（PET）微粉表面成功接枝亲水性单体丙烯酸（AA）和2-丙烯酰胺-2-甲基丙磺酸（AMPS），制备高亲水性的PET微粉。在氮气氛围下对PET微粉（粒径20 μm）和AA/AMPS混合之后的半干状固体进行γ辐照处理，吸收剂量为100 kGy。结果表明：改性后的PET微粉分散性及亲水性随接枝率的增加而增强。当AA/AMPS单体质量浓度为20%，AA、AMPS质量比为2∶1的情况下，接枝率可达15.2%，改性PET在水溶液中具有良好的分散稳定性，水接触角由125.4°下降至60.3°。采用傅里叶变换红外光谱仪（FTIR）、扫描电子显微镜（SEM）、热重分析（TG）等分析方法证实AA/AMPS被成功接枝到PET微粉表面。

Hydrophilic monomers, acrylic acid (AA) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS), were successfully grafted onto the surface of polyethylene terephthalate (PET) micropowder via a radiation-induced grafting method to produce highly hydrophilic PET micropowder. The semi-dry solid mixture of PET micropowder (particle size 20 μm) and AA/AMPS was subjected to γ-irradiation under a nitrogen atmosphere with an absorbed dose of 100 kGy. The results showed that the dispersibility and hydrophilicity of the modified PET micropowder increased with the grafting rate. When the mass fraction of AA/AMPS monomers was 20% and the mass ratio of AA to AMPS was 2∶1, the grafting rate reached 15.2%, the modified PET exhibited good dispersion stability in aqueous solution, and the water contact angle decreased from 125.4° to 60.3°. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermogravimetric analysis (TG) were used to confirm the successful grafting of AA/AMPS onto the surface of PET micropowder.