Abstract
A study was made of the effect of various factors on the rate at which polycarbonate (PC) turns yellow during oxidation. It was shown that the rate of turning yellow depends in a linear manner of oxygen pressure. An increase in the content of phenol end groups in the initial polymer increases the rate of turning yellow thereby changing the kinetic pattern of this process. The process of turning yellow is accelerated by the presence of steam in the reaction system. It is known that the main cause of colouring of PC during oxidation is the formation of polyconjugated systems (PCS). It was shown in this study that the formation of PCS in PC when T ⩽280° and at an oxygen pressure of 75 torr after a brief induction period takes place at constant rate and with an activation energy of 33 kcal/mole. On increasing temperature ( T>305°) the process of formation of PCS undergoes self-acceleration.
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