کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6466215 | 1422953 | 2017 | 11 صفحه PDF | دانلود رایگان |
- Reduced graphene oxide (RGO) was melt-processed into polycarbonate (PC).
- RGO can enhance the toughness, strength and notch resistance of PC greatly.
- The toughening mechanism was investigated.
- Microcrack, crack pinning, deflection and arresting were the toughening mechanism.
The toughening effect of graphene sheets on polycarbonate (PC) was investigated to fabricate PC composites with excellent balanced toughness, notch resistance as well as strength. The reduced graphene oxide (RGO) was incorporated into PC matrix through melt compounding. A maximum toughening effect was observed in PC/RGO (PCG) composites with 0.03Â wt% or 0.07Â wt% RGO. Particularly, the tensile fracture toughness of PCG composites with 0.03Â wt% RGO was enhanced by 89%. The notched impact strength and KIC of PCG composite with 0.07Â wt% RGO was increased by 46% and 58%, respectively. The point of 0.1Â wt% was found to be the ductile-brittle transition point in PCG composites. Meanwhile, the yield strength of these novel materials was increased by around 12% as well at loading of 0.07Â wt%. Microcrack, resulting from interfacial debonding between PC and RGO as well as breakage and pulling out of graphene layer, was proposed to be the main toughening mechanism contributing to the great enhanced fracture toughness and notch resistance. Apart from the microcrack, crack pinning, crack deflection and crack arresting were also found and proposed to be toughening mechanism in notch-fractured process. This work not only provides us a novel strategy to fabricate advanced PC nanocomposites but also gives us a deep understanding on the toughening role of graphene on polymers.
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Journal: Chemical Engineering Journal - Volume 325, 1 October 2017, Pages 474-484