In order to prolong the thermo-oxidative stability of polypropylene and prevent antioxidant loss, this research details an effective approach to prepare polymeric antioxidant via surface functionalization of polypropylene with long-chain macromolecules containing hindered phenolic stabilizers. The polymeric antioxidant (PPNA) is prepared by amide bond formation between phenolic stabilizer containing carboxylic acid moiety and amine functionalized polypropylene (PPNH₂). Test results confirmed surface changes through plasma treatment, amine and antioxidant modification. The resultant PPNH₂ and PPNA exhibit reduced crystallinity while the crystallization temperature shifts toward higher values, suggesting simultaneous effects of steric hindrance and nucleation of long-chain structures. Immobilization of phenolic stabilizer results in improving thermo-oxidative stability of polypropylene. Subsequently, PPNA was used to prepare PP/PPNA blends to evaluate free radical scavenging ability and resistance to extraction. The blends demonstrate superior thermal stability and low volatility compared to stabilized polypropylene with Irganox 1010, indicating uniform distribution due to comparability. The synthesized polymer-bound antioxidant have the potential to be the material of choice as stabilizer concentrate for packaging, coating and thin film applications.

为了延长聚丙烯的热氧化稳定性并防止抗氧化剂的损失，本研究详细介绍了一种有效的方法，该方法是通过使用含有受阻酚稳定剂的长链大分子对聚丙烯进行表面官能化来制备聚合物抗氧化剂。聚合抗氧化剂（PPNA）是通过在含羧酸部分的酚类稳定剂与胺官能化的聚丙烯（PPNH ₂）之间形成酰胺键来制备的。测试结果证实了通过等离子处理，胺和抗氧化剂改性后的表面变化。所得的PPNH ₂PPNA和PPNA的结晶度降低，而结晶温度向更高的方向移动，这表明空间位阻和长链结构成核同时发生。酚稳定剂的固定化提高了聚丙烯的热氧化稳定性。随后，使用PPNA制备PP / PPNA共混物，以评估自由基清除能力和抗萃取性。与具有Irganox 1010的稳定化聚丙烯相比，该共混物表现出优异的热稳定性和低挥发性，由于可比性，表明分布均匀。合成的与聚合物结合的抗氧化剂有可能成为包装，涂料和薄膜应用中稳定剂浓缩物的选择材料。