Effect of MWCNTs Functionalization on Thermal, Electrical, and Ammonia-Sensing Properties of MWCNTs/PMMA and PHB/MWCNTs/PMMA Thin Films Nanocomposites

被引:21
作者
Qazi, Raina Aman [1 ,2 ]
Khattak, Rozina [2 ]
Shah, Luqman Ali [1 ]
Ullah, Rizwan [1 ]
Khan, Muhammad Sufaid [3 ]
Sadiq, Muhammad [4 ]
Hessien, Mahmoud M. [5 ]
El-Bahy, Zeinhom M. [6 ]
机构
[1] Univ Peshawar, Natl Ctr Excellence Phys Chem, Polymer Lab, Peshawar 25120, Pakistan
[2] Shaheed Benazir Bhutto Women Univ, Dept Chem, Peshawar 25000, Pakistan
[3] Univ Malakand, Dept Chem, Chakdara 18800, Pakistan
[4] Quaid I Azam Univ, Dept Chem, Islamabad 45320, Pakistan
[5] Taif Univ, Coll Sci, Dept Chem, POB 11099, At Taif 21944, Saudi Arabia
[6] Al Azhar Univ, Fac Sci, Dept Chem, Cairo 11884, Egypt
关键词
nanocomposites; multiwalled carbon nanotubes; poly(3-hydroxybutyrate); poly(methyl methacrylate); ammonia sensors; thermal stability; electrical properties; WALLED CARBON NANOTUBES; MECHANICAL-PROPERTIES; DIELECTRIC-PROPERTIES; COMPOSITES; CONDUCTIVITY; DEGRADATION; DISPERSION; BLENDS; PMMA; POLY(3-HYDROXYBUTYRATE);
D O I
10.3390/nano11102625
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Partially biodegradable polymer nanocomposites Poly(3-Hydroxybutyrate) (PHB)/MultiwalledCarbon Nanotubes (MWCNTs)/Poly(Methyl Methacrylate) (PMMA)and non-biodegradable nanocomposites (MWCNTs/PMMA) were synthesized, and their thermal, electrical, and ammonia-sensing properties were compared. MWCNTs were chemically modified to ensure effective dispersion in the polymeric matrix. Pristine MWCNTs (p-MWCNTs) were functionalized with -COOH (a-MWCNTs) and amine groups (f-MWCNTs). Then, PHB grafted multiwalled carbon nanotubes (g-MWNTs) were prepared by a 'grafting to' technique. The p-MWCNTs, a-MWCNTs, f-MWCNTs, and g-MWCNTs were incorporated into the PMMA matrix and PMMA/PHB blend system by solution mixing. The PHB/f-MWCNTs/PMMA blend system showed good thermal properties among all synthesized nanocomposites. Results from TGA and dTGA analysis for PHB/f-MWCNTs/PMMA showed delay in T-5 (about 127 degrees C), T-50 (up to 126 degrees C), and T-max (up to 65 degrees C) as compared to neat PMMA. Higher values of frequency capacitance were observed in nanocomposites containing f-MWCNTs and g-MWCNTs as compared to nanocomposites containing p-MWCNTs and a-MWCNTs. This may be attributed to their excellent interaction and good dispersion in the polymeric blend. Analysis of ammonia gas-sensing data showed that PHB/g-MWCNTs/PMMA nanocomposites exhibited good sensitivity (approximate to 100%) and excellent repeatability with a constant response. The calculated limit of detection (LOD) is 0.129 ppm for PHB/g-MWCNTs/PMMA, while that of all other nanocomposites is above 40 ppm.
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页数:21
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