Poly(lactic acid) (PLA) was functionalized with itaconic anhydride (IAH) via radical grafting in melt initiated by 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (L101). The main interest was the real-time monitoring of grafting reaction using oscillatory rheology which was considered as an effective tool for monitoring radical grafting. It was found that low concentration of IAH and high concentration of L101 leads to the high grafting efficiency while further increase of IAH concentration does not lead to the proportional increase of grafting degree due to predomination of β-scission. Nevertheless, high grafting efficiency is accompanied by PLA crosslinking as evidenced from both rheology data. Therefore,

2,6-di-tert-butyl-4-methylphenol (BHT) was applied at different L101/BHT molar ratio with potential to reduce the extent of crosslinking. The effect of BHT was real-time evidenced during the reaction performed by internal mixer and rotational rheometer. The kinetics of the PLA grafting/crosslinking was studied using differential scanning calorimetry (DSC) which confirmed both rheological data and the difference in kinetics parameters for radical reaction with/without BHT. Both techniques proved desired effect of BHT at L101/BHT molar ratio greater than 1/0.5 which makes BHT promising agent for better control of grafting process and suppression of undesired collateral reactions.

通过由2,5-二甲基-2,5-双（叔丁基过氧）己烷（L101）引发的熔体中的自由基接枝，用衣康酸酐（IAH）将聚乳酸（PLA）官能化。主要兴趣是使用振荡流变学实时监测接枝反应，这被认为是监测自由基接枝的有效工具。发现低浓度的IAH和高浓度的L101导致高的接枝效率，而IAH浓度的进一步增加并不会导致由于β断裂占主导地位的接枝度成比例的增加。然而，从两个流变学数据证明，高接枝效率伴随有PLA交联。所以，

以不同的L101 / BHT摩尔比施用2，6-二叔丁基-4-甲基苯酚（BHT），具有降低交联程度的潜力。在内部混合器和旋转流变仪进行反应期间，实时证明了BHT的作用。使用差示扫描量热法（DSC）研究了PLA接枝/交联的动力学，该动力学证实了流变学数据和有/无BHT的自由基反应的动力学参数差异。两种技术都证明了B101在L101 / BHT摩尔比大于1 / 0.5时具有理想的效果，这使BHT有望成为更好地控制接枝过程和抑制不希望的副反应的有希望的剂。