Effect of Weathering and Accelerated Photoaging on PET/PC (80/20 wt/wt%) Melt Extruded Blend

Homero Modesto Pires; Luis Claudio Mendes; Sibele Piedade Cestari; Victor Jayme Roget Rodriguez Pita

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Effect of Weathering and Accelerated Photoaging on PET/PC (80/20 wt/wt%) Melt Extruded Blend

机译：风化和加速光老化对PET / PC（80/20 wt / wt％）熔融挤出共混物的影响

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In this study we investigated the natural weathering of a catalyzed blend of poly(ethylene terephthalate)/polycarbonate PET/PC (80/20wt/wt%). The results were compared to the accelerated photoaging tests. The specimens were characterized by wide angle X-ray diffraction (WAXD), optical microscopy (OM), thermogravimetry (TG/DTG), medium infrared spectroscopy (FT-IR) and stress-strain analysis. The OM analysis revealed the coexistence of at least three phases – one rich in PET (matrix), the other rich in PC (dispersed droplet) and an interfacial region between them, made of PET/PC copolymer (compatibilizing agent) produced in situ. The TG/DTG curves showed that UV radiation acted mainly on the PET-rich phase and the PET/PC copolymer. The OM and TG/DTG results indicated that the degradation of the compatibilizing agent has had a critical effect on the mechanical properties. For both types of aging (natural and accelerated), the PET’s carbonyl index decreased with the exposure time. The FT-IR results corroborated what was seen in the OM images, showing that the PET phase acts as a shield against the PC degradation. Under accelerated aging, the mechanical properties decreased abruptly - mainly the stress-strain at yield and break - due to the degradation of the in situ compatibilizing agent.

机译：在这项研究中，我们研究了聚对苯二甲酸乙二醇酯/聚碳酸酯PET / PC（80 / 20wt / wt％）的催化共混物的自然风化。将结果与加速光老化测试进行比较。通过广角X射线衍射（WAXD），光学显微镜（OM），热重分析（TG / DTG），中红外光谱（FT-IR）和应力应变分析对样品进行表征。 OM分析揭示了至少三个相的共存，一个相由原位生产的PET / PC共聚物（增容剂）制成，一个相富含PET（基质），另一相富含PC（分散液滴）和它们之间的界面区域。 TG / DTG曲线表明，紫外线辐射主要作用于富PET相和PET / PC共聚物。 OM和TG / DTG结果表明，相容剂的降解对机械性能具有关键影响。对于两种老化（自然老化和加速老化），PET的羰基指数都随着暴露时间的延长而降低。 FT-IR结果证实了在OM图像中看到的结果，表明PET相起到了防止PC降解的作用。在加速老化下，由于原位相容剂的降解，机械性能突然下降-主要是屈服和断裂时的应力应变。

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《Materials Research》 |2015年第4期|共6页
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Homero Modesto Pires; Luis Claudio Mendes; Sibele Piedade Cestari; Victor Jayme Roget Rodriguez Pita;
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Effect of Weathering and Accelerated Photoaging on PET/PC (80/20 wt/wt%) Melt Extruded Blend

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