Abstract
Graphene oxide (GO) and multiwalled carbon nanotubes with silver particles (MWNT-Ag) of different concentrations were used as nanofillers to prepare poly(lactic acid) (PLA) nanoparticle films through the solvent casting method. In this study, the effects of nanoparticles on the crystallization behavior, relationships between the dispersion and electrical properties, and hydrolytic degradation behaviors were investigated for the PLA/MWNT-Ag and PLA/rGO films. Differential scanning calorimetry was used to evaluate the crystallization behaviors of the PLA/MWNT-Ag and PLA/reduced GO (rGO) films. Electron probe microanalysis was performed to characterize the dispersion of MWNT-Ag, and X-ray diffraction and Raman spectroscopy were used to determine the degree of dispersion of rGO in the PLA matrix. The results showed that nanoparticles enhanced the crystallization kinetics of PLA as well as the hydrolytic degradation rate. From the measurement of electrical properties, the electrical conductivity of PLA/MWNT-Ag 1.0 wt% was much higher than that of the pure PLA and PLA/rGO films, showing that MANT and Ag nanoparticles contribute greatly to enhancing the electrical conductivity of the PLA/MWNT-Ag films.
Highlights
Poly(lactic acid) (PLA), as one of the environment-friendly biodegradable polymers, has been in the spotlight owing to its excellent mechanical properties [1,2,3,4], and because its hydrolysates are not harmful to the human body or to the environment [5,6,7]
Dil et al [21] studied the electrical conductivity of poly(lactic acid) (PLA)/poly(butylene adipate-co-terephthalate)/multiwalled carbon nanotubes (MWNT), and their results showed that the MWNTs performed interface bridging, increasing the electrical conductivity of the samples
TllraPnLsApa/rMenWcyNT-Ag films were opaque with a low-weight percentage of MWNT-Ag (FigureA1lbl)P, LwAh/eMreaWs,NtTh-eAPgLfiAlm/rGs Owefrielmospawqeureewtriatnhsaplaorwen-wt aetiglohwt peerrrcGenOtacgoenocfenMtrWatNioTn-sAg (Fi(gFuigreur2ed1).bH),owwheevreera,st,htehPeLPAL/ArG/rOGfOilmfislmbescwamereestlriagnhstplyaorepnatqautelowwhernrtGheOcoconncecnentrtartaitoinons of.igHhoewr tehvaenr, 2th.5ewPtL%A,/orwGiOngfitlmo tshbeeucanmeveesnlidgihstplyerospioanquoef twhheernGtOhepcaortnicelenst.rAatsion showf rnGOin wFiagsuhriegh3,erathiagnh2ly.5twratn%s,poawreinntgstaomthpeleuonfevtheen PdLisApe/rGsiOon1o.0f twhet%rGfOilmpawrtaicsleosb. -As sersvheodw, nsiimniFlaigrutoret3h,eaPhLigAhfliylmtr.ansparent sample of the PLA/reduced GO (rGO) 1.0 wt% film was observed, similar to the PLA film
Summary
Poly(lactic acid) (PLA), as one of the environment-friendly biodegradable polymers, has been in the spotlight owing to its excellent mechanical properties [1,2,3,4], and because its hydrolysates are not harmful to the human body or to the environment [5,6,7]. With properties being an issue for PLA, many research groups have made lots of effort to improve the mechanical and electrical conductivity of PLA-based composites by adding various carbon nanofillers, such as multiwalled carbon nanotubes (MWNT), carbon black, graphite, and graphene [1,15,16,17,18,19]. Among these carbon nanofillers, MWNT and graphene are the most popular owing to their superior electrical properties as well as their high aspect ratio. Guo et al [22] proposed that a combination of reduced GO (rGO) and graphite could effectively improve the electrical and thermal properties
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