Study on Thermal Conductivity of BNNs/Mg(OH)2/LDPE Composites Based on Melt Blending Method

Graphene nanoplatelets (GNP) and nylon (PA) have been often used as thermal filler and matrix and respectively to produce composites. In this work, PA6/PA66/GNP thermal composites were prepared via a melt blending method. Mechanical properties, morphology, and thermal properties of PA6/PA66/GNP composites were investigated. Because the GNP is very expensive, we investigated to use Al2O3 and graphite and examined the characteristics of the prepared composites. Thermal conductivity values of PA6/PA66/GNP composites remarkably increased with increase of GNP contents mainly via layered dispersion in nylon matrix. The thermal conductivity of composite containing 50 wt % of GNP was measured as 5.03 W·m–1·K–1 at 30 °C, indicating an increase of more than 15 times compared with that of the neat PA6. When the Al2O3 was replaced for GNP, the thermal conductivity of composites decreased, but the mechanical properties improved. When graphite was used to replace for GNP, thermal conductivity basically remained unchanged but mechanical properties decreased.

Download Full-text

The Effect of Nanoparticles Composition on Tensile and Thermal Properties of Polystyrene Reinforced with Graphene Nanoplatelets

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i4.30.22306 ◽

2018 ◽

Vol 7 (4.30) ◽

pp. 347

Author(s):

Baharom M. H ◽

Mat Desa M.S. Z ◽

Izhab I ◽

Yusop M ◽

Kasnan N. Z ◽

...

Keyword(s):

Thermal Conductivity ◽

Thermal Properties ◽

Testing Machine ◽

Graphene Nanoplatelets ◽

Gravimetric Analysis ◽

Melt Blending ◽

Reinforcement Effect ◽

X Ray Diffraction ◽

Transmission Electron ◽

Blending Method

This study presents the reinforcement effect of graphene nanoplatelets (GNP) on tensile and thermal properties of polystyrene/graphene nanoplatelets (PS/GNP) nanocomposites. The PLA/GNP nanocomposites were prepared by melt-blending method with the GNP contents varied at 0.5, 1.0, and 1.5 wt %. The tensile properties of PS/GNP nanocomposites were analysed by using universal testing machine, the thermal properties were investigated by thermal gravimetric analysis (TGA), and thermal conductivity analysis, while the morphology were characterized by Transmission Electron Microscopy (TEM) and X-Ray Diffraction (XRD) measurement. Steady improvement of tensile strength and Young’s Modulus was observed as the composition of GNP increased. The study also showed that the thermal stability and thermal conductivity of PS/GNP nanocomposites increase with increasing content of GNP. This study indicates strong influence of GNP contents on reinforcement effect and thermal properties of PS/GNP nanocomposites.

Download Full-text

Investigation and modeling of the thermal conductivity of PP/clay nanocomposites and PP/MWCNT nanocomposites

e-Polymers ◽

10.1515/epoly.2010.10.1.1062 ◽

2010 ◽

Vol 10 (1) ◽

Cited By ~ 1

Author(s):

Shahryar Jafari Nejad ◽

Aboali Golzary

Keyword(s):

Thermal Conductivity ◽

Carbon Nanotube ◽

Clay Nanocomposites ◽

Melt Blending ◽

Blending Method ◽

Increasing Temperature ◽

Multi Wall Carbon Nanotube

AbstractIn this study, polypropylene/clay nanocomposites were prepared by melt blending method and their thermal conductivity and the thermal conductivity of polypropylene/multi-wall carbon nanotube (MWCNT) nanocomposites were investigated and modeled. It is found that the thermal conductivity of the PP/Clay and PP/MWCNT nanocomposites is increased with increasing temperature. The thermal conductivity of the nanocomposites is improved due to incorporation of nanoclay and MWCNT compared with pure PP matrix

Download Full-text

Mechanical, Thermal, and Morphological Properties of Thermoplastic Starch/Poly(lactic acid/Poly(butylene adipate-co-terephthalate) Blends

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.970.312 ◽

2014 ◽

Vol 970 ◽

pp. 312-316

Author(s):

Sujaree Tachaphiboonsap ◽

Kasama Jarukumjorn

Keyword(s):

Lactic Acid ◽

Impact Strength ◽

Interfacial Adhesion ◽

Tensile Modulus ◽

Thermoplastic Starch ◽

Morphological Properties ◽

Poly Lactic Acid ◽

Melt Blending ◽

Elongation At Break ◽

Blending Method

Thermoplastic starch (TPS)/poly (lactic acid) (PLA) blend and thermoplastic starch (TPS)/poly (lactic acid) (PLA)/poly (butylene adipate-co-terephthalate) (PBAT) blend were prepared by melt blending method. PLA grafted with maleic anhydride (PLA-g-MA) was used as a compatibilizer to improve the compatibility of the blends. As TPS was incorporated into PLA, elongation at break was increased while tensile strength, tensile modulus, and impact strength were decreased. Tensile properties and impact properties of TPS/PLA blend were improved with adding PLA-g-MA indicating the enhancement of interfacial adhesion between PLA and TPS. With increasing PBAT content, elongation at break and impact strength of TPS/PLA blends were improved. The addition of TPS decreased glass transition temperature (Tg), crystallization temperature (Tc), and melting temperature (Tm) of PLA. Tgand Tcof TPS/PLA blend were decreased by incorporating PLA-g-MA. However, the presence of PBAT reduced Tcof TPS/PLA blend. Thermal properties of TPS/PLA/PBAT blends did not change with increasing PBAT content. SEM micrographs revealed that the compatibilized TPS/PLA blends exhibited finer morphology when compared to the uncompatibilized TPS/PLA blend.

Download Full-text

Thermal Stability and Crystallization Behavior of PP/Organoclay Phase Change Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.785-786.123 ◽

2013 ◽

Vol 785-786 ◽

pp. 123-126

Author(s):

Ying Ye ◽

Kun Yan Wang ◽

Ge Chang ◽

Qian Ying Jiang

Keyword(s):

Thermal Stability ◽

Phase Change ◽

Crystallization Behavior ◽

Melt Blending ◽

X Ray Diffraction ◽

Nucleation Agent ◽

Scanning Calorimetry ◽

Blending Method ◽

Phase Change Composites ◽

Change Material

Polypropylene/organoclay modified by dodecanol phase change material were prepared by melt blending method. The thermal stability and crystallization behavior was studied by thermogravimetry (TG), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). TG results indicated the window of processing of PP could be improved by adding small amount organoclay modified by dodecanol to the blend. DSC showed the organoclay modified by dodecanol affected the crystallization behavior of PP as heterogeneous nucleation agent. XRD results show that the organoclay modified by dodecanol does not change the crystal structure in the blends but only decrease the intensity of the diffraction peak.

Download Full-text

Effect of magnesium oxysulfate (MOS) morphology on the crystallization, mechanical, and rheological properties of polypropylene/MOS composites

Journal of Thermoplastic Composite Materials ◽

10.1177/0892705718772890 ◽

2018 ◽

Vol 32 (5) ◽

pp. 710-726 ◽

Cited By ~ 1

Author(s):

Li Dang ◽

Xueying Nai ◽

Xin Liu ◽

Zhihui Lv ◽

Wu Li

Keyword(s):

Rheological Properties ◽

Polarized Light ◽

Mechanical Tests ◽

Melt Blending ◽

X Ray Diffraction ◽

Small Amplitude Oscillatory Shear ◽

Blending Method ◽

Magnesium Oxysulfate ◽

Significant Yield ◽

The Impact

Polypropylene (PP) composites containing magnesium oxysulfate particle (MOSp), magnesium oxysulfate whisker (MOSw), or magnesium oxysulfate sector (MOSs) were prepared via melt blending method. Scanning electron microscopy results showed that three magnesium oxysulfate (MOS) fillers all dispersed homogeneously in PP matrix and displayed vague and fuzzy interfaces. Wide-angle X-ray diffraction (WXRD) patterns showed that MOSp induced the most amount of β-PP, which was supported by polarized light microscopy (PLM) photographs. Moreover, PLM photographs also showed that the presence of MOSp, MOSw, or MOSw decreased the PP spherulites, especially for MOSp. As such, mechanical tests showed that incorporation of MOSp into PP matrix greatly improved the impact strength and least lowered the nominal strain at break. The yield strength and Young’s modulus of composites were greatly enhanced with MOSw. Two possible reasons for this phenomenon are rigidity of MOSw and microstructure of composites. Rheological properties were measured via small amplitude oscillatory shear. The results showed that PP melts containing MOSw exhibited significant yield stress and “shear-thinning” behaviors, which indicated the formation of MOSw network and the transition from “liquid-like” PP matrix to “solid-like” composites. The rheological results greatly proved the enhancement in tensile properties of MOSw-incorporated composites.

Download Full-text

Preparation and Characterization of Flame Retardant PET Fiber via Melt Blending

Materials Science Forum ◽

10.4028/www.scientific.net/msf.913.729 ◽

2018 ◽

Vol 913 ◽

pp. 729-737

Author(s):

Hui Ling Xu ◽

Hong Kun Bao ◽

Chao Sheng Wang ◽

Hua Ping Wang

Keyword(s):

Flame Retardant ◽

Ethylene Terephthalate ◽

Carbon Layer ◽

Melt Blending ◽

Fiber Fracture ◽

Limiting Oxygen Index ◽

Poly Ethylene Terephthalate ◽

Blending Method ◽

Poly Ethylene

Poly(ethylene terephthalate) (PET) fiber with excellent flame retardant property was prepared with introducing a containing phosphorus flame retardant 10-(2’,5’-dihydroxyphenyl) -9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (ODOPB) into PET by melt blending method. The intrinsic viscosity of the modified PET was decreased after melt blending, indicated that ODOPB could promote the degradation of PET. The addition of ODOPB can increase the amount of carbon residue of PET, which can effectively reduce the heat transfer. The movement and regularity of PET molecular chain are affected by ODOPB, resulting in the reducing of the crystallization of PET. The Raman curves indicate that the addition of ODOPB can improve the regularity of carbon layer, which is conducive to achieve the effect of flame retardant. When the mass fraction of P is 0.7 %, the limiting oxygen index of sample reaches 32.4% and UL-94 vertical reaches V-2, the fiber fracture strength is 2.6 cN/dtex, which has excellent flame retardant and mechanical properties.

Download Full-text

Thermal Properties of PEG/Graphene Nanoplatelets (GNPs) Composite Phase Change Materials with Enhanced Thermal Conductivity and Photo-Thermal Performance

Applied Sciences ◽

10.3390/app8122613 ◽

2018 ◽

Vol 8 (12) ◽

pp. 2613 ◽

Cited By ~ 1

Author(s):

Lihong He ◽

Hao Wang ◽

Hongzhou Zhu ◽

Yu Gu ◽

Xiaoyan Li ◽

...

Keyword(s):

Thermal Conductivity ◽

Phase Change ◽

Energy Conversion ◽

Phase Change Materials ◽

Near Infrared ◽

Graphene Nanoplatelets ◽

Solar Irradiation ◽

Blending Method ◽

Conduction Pathway ◽

Composite Phase Change Materials

This paper mainly concentrates on the thermal conductivity and photo-thermal conversion performance of polyethylene glycol (PEG)/graphene nanoplatelets (GNPs) composite phase change materials (PCMs). The temperature-assisted solution blending method is used to prepare PCM with different mass fraction of GNPs. According to the scanning electron microscope (SEM), GNPs are evenly distributed in the PEG matrix, forming a thermal conduction pathway. The Fourier transform infrared spectra (FT-IR) and X-ray diffraction (XRD) results show that the composites can still inherit the crystallization structure of PEG, moreover, there are only physical reactions between PEG and GNPs rather than chemical reactions. Differential scanning calorimeter (DSC) and thermal conductivity analysis results indicate that it may be beneficial to add a low loading ration of GNPs to obtain the suitable latent heat as well as enhance the thermal conductivity of composites. To investigate the change in the rheological behavior due to the effect of GNPs, the viscosity of the composites was measured as well. The photo-thermal energy conversion experiment indicates that the PEG/GNPs composites show better performance in photothermal energy conversion, moreover, the Ultraviolet-visible-Near Infrared spectroscopy is applied to illustrate the reasons for the higher absorption efficiency of PEG/GNPs for solar irradiation.

Download Full-text

Effect Addition of Octadecylamine Modified Clay (ODA-MMT) to Polylactide/Polycaprolactone (PLA/PCL) Blend

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.364.317 ◽

2011 ◽

Vol 364 ◽

pp. 317-321 ◽

Cited By ~ 3

Author(s):

Siti Zulaiha Hairaldin ◽

Wan Md Zin Wan Yunus ◽

Nor Azowa Ibrahim

Keyword(s):

Polymer Nanocomposite ◽

Average Diameter ◽

Sem Analysis ◽

Clay Nanocomposites ◽

Melt Blending ◽

X Ray Diffraction ◽

X Ray ◽

Blending Method ◽

Sem Micrograph ◽

Internal Mixer

In this study, Octadecylamine Modified montmorillonites (ODAMMT) were used to prepare polylactide/polycaprolactone (PLA/PCL) clay nanocomposites. PLA and PCL were blend using an internal mixer by melt blending method. The other sample was blend with natrium monmorillonite (NaMMT) and Octadecylamine modified monmorillonite to produce PLA/PCL-NaMMT and PLA/PCL-ODAMMT. To characterize the polymer nanocomposite, X-ray diffraction (XRD), FTIR and SEM analysis were conducted. Comparison of morphology were made up between neat PLA/PCL, PLA/PCL with presence of of montmorillonite and octadecylamine modified monmorillonite respectively based on SEM micrograph. The number-average diameter was calculated for PLA/PCL, PLA/PCL-NaMMT, and PLA/PCL-ODAMMT.

Download Full-text

Preparation and Property Study of PMMA/ASA Alloy

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.130-134.2383 ◽

2011 ◽

Vol 130-134 ◽

pp. 2383-2387

Author(s):

Guo Dong Tang ◽

Si Chen ◽

Yan Qin Shi ◽

Xu Wang

Keyword(s):

Flow Rate ◽

Melt Blending ◽

Dsc Analysis ◽

Melt Flow ◽

Scanning Calorimetry ◽

Melt Flow Rate ◽

Interface Phase ◽

Blending Method ◽

Method Effects ◽

The Impact

Polymethyl methacrylate (PMMA)/ acrylonitrile-styrene-acrylate terpolymer (ASA) alloy was prepared via melt blending method. Effects of ASA melt flow rate and PMMA/ASA ratio on mechanical property of the alloy were studied. It showed that when the high melt flow rate ASA was used, alloy’s tensile strength and flexural strength were little different from using low melt flow rate ASA, while the impact strength was significantly higher than the latter. Differential scanning calorimetry (DSC) analysis showed that a glass transition (Tg) platform emerged in low melt flow rate ASA at 48.5°C, which represented the Tg of the interface phase formed between SAN grafted acrylate rubber particles and SAN matrix. Scanning electron microscope (SEM) experiment further showed that when low melt flow rate ASA was used, alloy’s cross section was smooth which showed the characteristics of brittle fracture.

Download Full-text