Surface modification of MWCNT and its influence on properties of paraffin/MWCNT nanocomposites as phase change material

Self Cite

The reactive compatibilization of blends consisting polypropylene (PP) and thermoplastic starch (TPS) (70/30) with different portions of PP‐grafted maleic anhydride (PP‐g‐MA) is carried out by melt mixing. The esterification reaction between the starch hydroxyl and the PP‐g‐MA groups proved by the FTIR leads to a compatibility improvement. The dynamic rheological properties, morphology, elongation at break, and the impact strength of the blends were studied. The SEM images show that increasing the compatibilizer concentration reduces the dispersed TPS droplet size. The generalized Zener model states that an elastic interface is established (minimum α value) and enables us to predict the dynamic rheological properties of our blends in a longer frequency range to where the current experimental limitation exists. The modified Cross model is implemented to confirm better adhesion between phases when 20 wt % PP‐g‐MA is used (minimum ac value). The increase in the dynamic viscoelastic moduli at concentrations up to 20 wt % and the observed plateau at the elongation at break point at this concentration confirmed that this concentration is the optimum for the maximum stress transfer. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48742.

Section: Resultsmentioning

confidence: 99%

Effect of compatibilizer concentration on dynamic rheological behavior and morphology of thermoplastic starch/polypropylene blends

Raee

Avid

Kaffashi

2019

Self Cite

“…Although waste polyethylene wax and its blends have not been extensively studied in the literature, there are many studies regarding various other waxes and their blends with other material 4–7 . Paraffin wax has been used as model systems for polyethylene for studying electrical conductivity, and the conductivity of wax has been studied since 1932 8 .…”

Section: Introductionmentioning

confidence: 99%

Morphology, phase diagram, and properties of high‐density polyethylene/thermally treated waste polyethylene wax blends

Esmaeilzade

Sharif

Rashedi

et al. 2021

Waste polyethylene wax is thermally treated using a rotary evaporator to reduce unwanted components. Fourier transform infrared proves the absence of undesirable material. Wax is extruded with high‐density polyethylene (HDPE) at various loadings to study its morphology and final properties. Scanning electron microscopy and differential scanning calorimeter were employed to obtain the phase diagram showing the immiscibility of blends containing more than 20 wt% of wax. Due to the low melting temperature of the wax and its plasticating effect on HDPE, a decrease in melting temperature, enthalpy of fusion, and crystallinity with increasing wax content of the blend is observed. The phase diagram displays four possible phases depending on temperature and wax loading. Improved processability of HDPE/wax blends is demonstrated using complex viscosity curves. Han plots prove the miscibility of wax and HDPE in the melt state even at high concentrations of wax. HDPE/wax compounds have lower crystallinity, and wax particles, acting as weak spots, lower the elastic modulus, yield stress, and stress and strain at break as wax content increases. An increase in yield strain is observed due to the more effortless extension of HDPE chains at higher wax content. In 10 wt% of wax is accepted as the upper limit for wax incorporation into the HDPE matrix.

“…Recently, organic PCM has been widely used in solar energy, building energysaving, electronics and textile industries due to its highthermal storage density, low cost, continuous melting and freezing and chemical stability. 1 Polyethylene glycol (PEG) has attracted significant interest among researchers for its suitable phase change temperature, higher latent heat capacity, non-toxicity, good thermal stability. 2,3 However, the leakage problem of post-melting PCM including PEG is widespread, restricting the application of PCM.…”

Section: Introductionmentioning

confidence: 99%

“…Phase change material (PCM) is a material that can change the state of the material to store or release energy during the phase change process. Recently, organic PCM has been widely used in solar energy, building energy‐saving, electronics and textile industries due to its high‐thermal storage density, low cost, continuous melting and freezing and chemical stability 1 . Polyethylene glycol (PEG) has attracted significant interest among researchers for its suitable phase change temperature, higher latent heat capacity, non‐toxicity, good thermal stability 2,3 .…”

Section: Introductionmentioning

confidence: 99%

Properties and characterization of novel expanded dickite based composite phase change material

Ding

Yang

et al. 2022

Expanded dickite as the carrier of loading polyethylene glycol (PEG), a novel composite phase change material (PCM) is synthetized. X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, specific surface area test, thermogravimetric analysis, and differential scanning calorimetry are used to characterize and evaluate the expanded dickite carrier and the composite PCMs. The results show that the heat released by the reaction of potassium chlorate and urea promotes the layer expansion of dickite to form a net-like porous structure. Two kinds of expanded dickite (EDU1 and EDU2) carriers are prepared by modulating the amount of potassium chlorate. EDU2 carrier with full layer expansion possesses a PEG load rate of 179.3%. The higher PEG load rate of EDU2 is attributed to its developed pore structure, and the hydrogen bond formed between PEG and expanded dickite. Composite PCM using EDU2 as the carrier has a higher latent heat of 98.22 J g À1 and good thermal cycling stability.