涤纶和天然纤维相比存在含水率低、透气性差、染色性差、容易起球起毛、易沾污等缺点。为了改善这些缺点，采取化学改性和物理变形的方法。
Compared with natural fibers, polyester fibers have some disadvantages, such as low moisture content, poor air permeability, poor dyeing, easy pilling and fuzzing, and easy staining. In order to improve these shortcomings, chemical modification and physical deformation are adopted.
化学改性方法有：
Chemical modification methods include:
①添加有亲水基团的单体或低聚体聚乙二醇等进行共聚，能提高纤维的吸湿率；
(1) Adding hydrophilic monomers or oligomers such as polyethylene glycol to copolymerize can improve the moisture absorption of the fibers.
②添加具有抗静电性能的单体进行共聚，可以提高纤维的抗静电和抗沾污性能；
(2) Adding monomers with antistatic properties to copolymerize can improve the antistatic and antifouling properties of the fibers.
③添加含磷、含卤素和锑的化合物以改善纤维耐燃烧性能；
(3) Compounds containing phosphorus, halogen and antimony were added to improve the combustion mojuljs.37ix.com.cnzaoxingcz.37ix.com.cnwww.baodingjiaju.cnresistance of the fibers.
④采用较低聚合度的聚酯纺丝以提高抗起球能力；
(4) Polyester spinning with lower degree of polymerization was used to improve pilling resistance.
⑤与亲染料基团的单体（如磺酸盐等）进行共聚，以改善纤维的染色性能。
(5) Copolymerization with dye-affinity monomers (such as sulfonates) to improve the dyeing properties of the fibers.hengshui.75ix.cnpaishuigou.37ix.com.cnyamodai.37ix.com.cn
经过物理变形的有各种异形涤纶、与其他高聚物复合纺丝、着色的涤纶、细旦涤纶和高收缩涤纶等。
After physical deformation, there are various profiled polyester fibers, composite spinning with other polymers, colored polyester fibers, fine denier polyester fibers and high shrinkage polyester fibers.