聚碳酸酯/原位还原石墨烯复合材料的光氧老化行为研究
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摘要
研究了光氧老化对聚碳酸酯(PC)/原位还原石墨烯(IrGO)复合材料结构和性能的影响。傅里叶变换红外光谱分析显示PC分子在紫外辐照下发生了光氧化和弗里斯重排反应;同时在老化后,PC/IrGO辐照面的玻璃化转变温度和分子量均高于空白品PC。结合对样品辐照面的红外光谱逐层分析显示,还原石墨烯可以屏蔽紫外光从而抑制PC材料的光氧老化。力学性能测试和断面分析表明,相较于空白品PC,IrGO的存在使得PC/IrGO材料在长期光氧老化之后仍然能保持一定的韧性。
The effect of photo-oxidation aging on the structure and properties of polycarbonate(PC)/in-situ thermal reduced graphene oxide(IrGO)composites were studied.Fourier transform infrared spectroscopy analysis shows that PC molecules undergo photo-oxidation and Fries rearrangement under ultraviolet irradiation.At the same time,the glass transition temperature and molecular weight of irradiated surface of PC/IrGO are higher than those of control PC.The infrared spectra of irradiated sample surfaces show that IrGO could shield ultraviolet light and inhibit the photo-oxidation aging of PC materials.Mechanical properties test and cross-section analysis show that the presence of IrGO makes PC/IrGO materials maintain a certain toughness even after a long-term photooxidation aging compared with control PC.
The effect of photo-oxidation aging on the structure and properties of polycarbonate(PC)/in-situ thermal reduced graphene oxide(IrGO)composites were studied.Fourier transform infrared spectroscopy analysis shows that PC molecules undergo photo-oxidation and Fries rearrangement under ultraviolet irradiation.At the same time,the glass transition temperature and molecular weight of irradiated surface of PC/IrGO are higher than those of control PC.The infrared spectra of irradiated sample surfaces show that IrGO could shield ultraviolet light and inhibit the photo-oxidation aging of PC materials.Mechanical properties test and cross-section analysis show that the presence of IrGO makes PC/IrGO materials maintain a certain toughness even after a long-term photooxidation aging compared with control PC.
引文
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[2]YANG J L,HUANG Y J,LV Y D,et al.The synergistic mechanism of thermally reduced graphene oxide and antioxidant in improving the thermo-oxidative stability of polypropylene[J].Carbon,2015,89:340-349.
[3]ZHOU J J,WEI L Y,WEI H T,et al.The synthesis of graphene-based antioxidants to promote anti-thermal properties of styrene-butadiene rubber[J].RSC Adv,2017,7(84):53596-53603.
[4]GLOVER A J,CAI M,OVERDEEP K R,et al.In situ reduction of graphene oxide in polymers[J].Macromolecules,2011,44(24):9821-9829.
[5]ZHANG J B,JI S J,SONG J,et al.Flow accelerates interfacial coupling reactions[J].Macromolecules,2010,43(18):7617-7624.
[6]MARCANO D C,KOSYNKIN D V,BERLIN J M,et al.Improved synthesis of graphene oxide[J].ACS Nano,2010,4(8):4806-4814.
[7]YANG H L,LI Z L,ZOU H W,et al.Preparation of porous polyimide/in-situ reduced graphene oxide composite films for electromagnetic interference shielding[J].Polym Adv Technol,2017,28(2):233-242.
[8]GHAFOURI-NEJAD R,HAJJAMI M,NEJAT R.Preparation and characterization of Ni-modified graphene oxide complex as an efficient catalyst for the synthesis of sulfides via reaction of arylhalides with S8 or thiourea[J].Appl Organomet Chem,2018,32(4):e4248
[9]JIANG L,ZHOU M Y,DING Y Y,et al.Aging induced ductile-brittle-ductile transition in bisphenol A polycarbonate[J].J Polym Res,2018,25(2):39.
[10]DIEPENS M,GIJSMAN P.Photodegradation of bisphenol A polycarbonate[J].Polym Degrad Stab,2007,92(3):397-406.
[11]DIEPENS M,GIJSMAN P.Photo-oxidative degradation of bisphenol A polycarbonate and its possible initiation processes[J].Polym Degrad Stab,2008,93(7):1383-1388.
[12]GERETOVSZKY Z,HOPP B,BERTóTI I,et al.Photodegradation of polycarbonate under narrow band irradiation at 172 nm[J].Appl Surface Sci,2002,186(1):85-90.
[13]CARVALHO A L F,MENDES L C,CESTARI S P,et al.Nanocomposites of recycled polycarbonate/nano-zinc oxide(rPC/nZnO):Effect of nanofiller and gamma-radiation on the properties and as barrier against ultraviolet light[J].J Nanosci Nanotechnol,2017,17(1):270-277.
[14]CHATTERJEE S,NAFEZAREFI F,TAI N H,et al.Size and synergy effects of nanofiller hybrids including graphene nanoplatelets and carbon nanotubes in mechanical properties of epoxy composites[J].Carbon,2012,50(15):5380-5386.
[15]PAREDES E,FRIAS P.SEM observations of crazing and fracture in polycarbonate[J].J Mater Sci Lett,1982,1(9):394-396.