抗氧剂在UHMWPE溶解过程中的作用

采用相对分子质量比较了抗氧剂1010和Ciba Irganox B 225混合抗氧剂在超高相对分子质量聚乙烯(UHMWPE)溶解过程中的抗降解作用。结果表明:在UHMWPE溶解过程中,随着温度的升高,加热时间的增长,UHMWPE的相对分子质量有明显的下降;而抗氧剂能有效抑制UHMWPE的降解,其用量增加,抑制 UHMWPE降解的作用也随之增大;当加热110 min,温度升至180℃时,加入质量分数为2％的混合抗氧剂, UHMWPE的相对分子质量下降33．9％,而未加混合抗氧剂时,UHMWPE的相对分子质量下降70．2％。相同用量时,混合抗氧剂效果比抗氧剂1010好。

Effect of antioxidant in dissolving UHMWPE process

Ultrahigh- molecular weight polyethylene ( UHMWPE) was added with some antioxidant to obtain degradation resistance during dissolution. The degradation resistance of antioxidants 1010 and Ciba Irganox B225 mixed antioxidant was compared by calculating the relative molecular weight of UHMWPE. The results showed that the relative molecular weight of UHMWPE was greatly decreased with increasing temperature and heating time during UHMWPE dissolution. Antioxidants can inhibit the degradation of UHMWPE efficiently, which became greater and greater with the addition. The relative molecular weight of UHMWPE was decreased by 33. 9% with adding 2% mixed antioxidant and by 70. 2% without adding any antioxidant after heating for 110 min at 180℃. Mixed antioxidant Ciba Irganox B225 had degradation resistance superior to antioxidant 1010 at the same amount.