The Influence of Carbon Nanotubes Contents on Electrical and Flammability Properties of Poly(Lactic Acid)/Multiwalled Carbon Nanotubes Nanocomposites

2017 ◽  
Vol 268 ◽  
pp. 365-369
Author(s):  
Mohd Shaiful Zaidi Mat Desa ◽  
Azman Hassan ◽  
Agus Arsad
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Melt Blending ◽  
Multiwalled Carbon ◽  
Limiting Oxygen Index ◽  
Blending Method ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The effects of carboxylic functionalized multi-walled carbon nanotubes (CNT) contents on electrical and flammability properties of poly(lactic) acid/CNT nanocomposites were investigated. The PLA/CNT nanocomposites were prepared by melt-blending method, where the CNT contents were varied from 1 to 9 phr. From flammability properties analysis, nanocomposites with 9 phr CNT showed the highest limiting oxygen index (LOI) of 26.5 vol% as compared to 19.5 vol% of neat PLA. All nanocomposites with higher than 5 phr CNT contents also passed the V0 class of UL-94 vertical burning test rating. The direct current electrical test revealed that the electrical conductivity increases by approximately seven orders of magnitude from 2.19 × 10-11 S/m of neat PLA to 2.00 × 10-4 S/m for PLA/CNT nanocomposites with 5 phr CNT contents. The electrical conductivity of PLA/CNT continues to increase beyond 5 phr contents, with 2.26 × 10-3 S/m and 4.29 × 10-3 S/m respectively for 7 and 9 phr contents. The good dispersion of CNT leads to formation of electron conducting CNT networks throughout the insulating PLA matrix.

Preparation and properties of PLA/long alkyl chain modified multi-walled carbon nanotubes nanocomposites

2011 ◽  
Vol 31 (1) ◽  
Author(s):  
Yeng-Fong Shih ◽  
Yen-Pin Wang ◽  
Chi-Fa Hsieh
Keyword(s):  
Carbon Nanotubes ◽  
Loss Modulus ◽  
Poly Lactic Acid ◽  
Melt Blending ◽  
Chemically Modified ◽  
Blending Method ◽  
Carboxylic Groups ◽  
Multi Walled Carbon Nanotubes ◽  
Modified Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Abstract In this investigation, poly(lactic) acid (PLA)/multi-walled carbon nanotubes (CNTs) hybrids were prepared using a melt blending process. To increase the compatibility between CNTs and PLA, the surfaces of the CNTs were firstly pretreated in acid solution (HNO3) to functionalize them with carboxylic groups (-COOH). Then, stearyl alcohol was grafted onto carboxylic groups using a dehydrating agent, N,N′-dicyclohexylcarbodiimide. Chemically modified CNTs (CNT-C18) were thus obtained. Therefore, modified carbon nanotubes (CNT-C18) dispersed excellently in organic solvents. PLA/CNTs nanocomposites were prepared by the melt-blending method. Experimental results reveal that the PLA/CNT-C18 nanocomposites that consisted of well-dispersed nanotubes exhibited enhanced thermal and mechanical properties. Adding 4 wt% CNT-C18 to a nanocomposite increased the storage modulus (E′) at 40°C by 17.8%, and the loss modulus (E″) at the glass transition temperature (T g ) by 15.1%. Adding 3 wt% CNT-C18 also reduced the surface resistivity of the PLA nanocomposites from >1016 Ω/cm2to 104 Ω/cm2. Such PLA/CNT-C18 nanocomposites are highly efficient in anti-static agents and can be exploited in the outer coverings of electronic devices.

Thermal Analysis of Polylactic Acid/Liquid Natural Rubber Reinforced with Multi-Walled Carbon Nanotubes

2016 ◽  
Vol 1133 ◽  
pp. 481-485 ◽  
Author(s):  
Adilah Mat Ali ◽  
Sahrim H. Ahmad
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Properties ◽  
Natural Rubber ◽  
Polylactic Acid ◽  
Melt Blending ◽  
Blending Method ◽  
Liquid Natural Rubber ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Thermal Stability Of

This article studies the thermal properties of multi-walled carbon nanotubes (MWCNT) reinforced polylactic acid (PLA)/liquid natural rubber (LNR) blends which prepared via melt blending method. Various percentages (0.5, 1.5, 2.5, 3.5 and 4 wt%) of MWCNT were added into PLA/LNR blend. TGA shows that the addition of MWCNT into PLA/LNR blends helps to improve thermal stability of the PLA/LNR/MWCNT nanocomposites. DSC shows that the glass transition temperature increased when 0.5%, 1.5%, 2.5% and 3.5% of MWCNT was added to the PLA/LNR blend. The cold crystallization and melting temperature were reduced when MWCNT was added in the PLA/LNR blend systems. The SEM micrographs confirm the effect of good dispersion of 3.5wt% of MWCNT in PLA/LNR blend helps to promote well combined MWCNT-matrix networks and generate the synergistic effect of the system which is improved the thermal properties significantly.

Development, optimization, and characterization of electrospun poly(lactic acid) nanofibers containing multi-walled carbon nanotubes

2007 ◽  
Vol 105 (3) ◽  
pp. 1668-1678 ◽  
Author(s):  
Seth D. McCullen ◽  
Kelly L. Stano ◽  
Derrick R. Stevens ◽  
Wesley A. Roberts ◽  
Nancy A. Monteiro-Riviere ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Flammability and thermal properties of modified carbon nanotubes in poly(lactic acid)

2018 ◽  
Vol 32 (8) ◽  
pp. 1107-1122 ◽  
Author(s):  
Chao Guo ◽  
Fei Xin ◽  
Congcong Zhai ◽  
Yu Chen
Keyword(s):  
Carbon Nanotubes ◽  
Lactic Acid ◽  
Flame Retardancy ◽  
Mass Loss Rate ◽  
Covalent Bond ◽  
Poly Lactic Acid ◽  
Cone Calorimetry ◽  
Limiting Oxygen Index ◽  
Multi Walled Carbon Nanotubes ◽  
Modified Carbon Nanotubes

The multi-walled carbon nanotubes (CNTs) were modified using phosphaphenanthrene compounds (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)) and vinyl triethoxy silane (VTES) by covalent bond. The DOPO- and VTES-treated CNTs were named DVCNT, and the structure was characterized by Fourier transform infrared, thermogravimetric analysis, and transmission electron microscopy. Nanocomposites were prepared by adding CNTs or DVCNT to poly(lactic acid) (PLA), and the flame retardancy was examined by determination of limiting oxygen index (LOI), vertical burning (UL94), and cone calorimetry. Results reveal that the LOI of PLA/DVCNT_4% composites was increased to 26.6 and prevents dripping of PLA in some level, and DVCNT can significantly reduce heat release rate and mass loss rate during combustion, which indicate that DVCNT can improve the dispersibility of the CNTs in the polymer composites and hence enhance the flame retardancy simultaneously.

scholarly journals Effects of Graphene Nanoplatelets and Multiwall Carbon Nanotubes on the Structure and Mechanical Properties of Poly(lactic acid) Composites: A Comparative Study

2019 ◽  
Vol 9 (3) ◽  
pp. 469 ◽  
Author(s):  
Todor Batakliev ◽  
Ivanka Petrova-Doycheva ◽  
Verislav Angelov ◽  
Vladimir Georgiev ◽  
Evgeni Ivanov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Lactic Acid ◽  
Low Cost ◽  
Multiwall Carbon Nanotubes ◽  
Poly Lactic Acid ◽  
Carbon Filler ◽  
Multi Walled Carbon Nanotubes ◽  
Carbon Fillers ◽  
Walled Carbon Nanotubes

Poly(lactic acid)/graphene and poly(lactic acid)/carbon nanotube nanocomposites were prepared by an easy and low-cost method of melt blending of preliminary grinded poly(lactic acid) (PLA) with nanosized carbon fillers used as powder. Morphological, structural and mechanical properties were investigated to reveal the influence of carbon nanofiller on the PLA–based composite. The dependence of tensile strength on nanocomposite loading was defined by a series of experiments over extruded filaments using a universal mechanical testing instrument. The applying the XRD technique disclosed that compounds crystallinity significantly changed upon addition of multi walled carbon nanotubes. We demonstrated that Raman spectroscopy can be used as a quick and unambiguous method to determine the homogeneity of the nanocomposites in terms of carbon filler dispersion in a polymer matrix.

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