为了实现聚碳酸酯的回收和循环利用,利用化学降解法实现聚碳酸酯(PC)的可控降解,得到端羟基聚碳酸酯.利用氯封端的聚二甲基硅氧烷与端羟基聚碳酸酯反应得到聚碳酸酯-聚二甲基硅氧烷(PC-PDMS)共聚物,采用红外、核磁、热重分析对共聚物进行了表征.测试结果表明,共聚物中PDMS的质量分数为37.73％,共聚物的热稳定性介于PC和降解产物之间.采用双螺杆挤出机制备PC/PC-PDMS共混物,用毛细管流变仪测试其流动性能.共混物注塑成标准样条用于力学性能测试,结果表明PC的缺口冲击强度得到提高.
In order to achieve recycle of polycarbonate (PC),hydroxy-terminated polycarbonate was prepared by controlled degradation of PC.Polycarbonate polydimethylsiloxane copolymer (PC-PDMS) was prepared by reaction of cholrine-terminated polydimethysiloxane and hydroxy-terminated polycarbonate.Infrared spectroscopy,nuclear magnetic resonance and thermo gravimetric were used to characterize the copolymer.Test results show that PDMS accounts for 37.73％ of the mass fraction of copolymer,the thermal stability of copolymer falls between PC and hydroxy-terminated polycarbonate.PC/PC-PDMS blends were prepared by twin-screw extruder and characterized through capillary rheometer.Then the blends were injected into standard spline for mechanical properties testing.Test resuks show improved notched impact strength but reduced tensile strength.
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