Degradation of polycarbonate during recycling in a capillary rheometer
Degradation of polycarbonate during recycling in a capillary rheometer
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毛细管流变仪回收过程中聚碳酸酯的降解
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
K. B. Abbås
中科院分区：
文献类型：
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作者：
K. B. Abbås
聚碳酸酯在毛细管流变仪中在高恒定剪切应力 (0.15–0.95 MPa) 和 275 至 320°C 之间的温度下进行回收。评估熔体粘度和分子量的变化。在重复挤出时观察到显着的聚合物降解。该过程初始阶段的活化能为 113 kJ/mol。降解动力学与非随机断链一致。结论是，键越靠近聚合物分子的中部，就越容易断裂，并且降解程度随着分子量的增加而增加。
Polycarbonate was recycled in a capillary rheometer at high constant shear stresses (0.15–0.95 MPa) and at temperatures between 275 and 320°C. Changes in melt viscosity and molecular weight were evaluated. Significant polymer degradation was observed on repetitive extrusion. An activation energy of 113 kJ/mol was determined for the initial stages of the process. The degradation kinetics were in agreement with a non-random chain scission. It was concluded that bonds were more susceptible to scission the closer they were to the middle of the polymer molecule and that the extent of degradation increased with an increase in molecular weight.