scholarly journals Morphological and Thermal Properties of Polystyrene Composite Reinforced with Biochar from Plantain Stalk Fibre

2020 ◽  
Vol 2 (2) ◽  
pp. 150-156 ◽  
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Thermal Properties ◽  
Functional Properties ◽  
Waste Disposal ◽  
Natural Fibres ◽  
Scanning Calorimetry ◽  
Plastic Composites ◽  
Infra Red

The advantages of natural fibres of synthetic fibres in the reinforcement of plastic composites have increased its use in diverse applications such as in the use of plant biochar in composite reinforcement. This research developed polystyrene composite development using biochar from plantain stalk fibre as filler. The composites obtained were analysed for their thermal and functional properties using Differential Scanning Calorimetry (DSC) and Fourier Transform Infra-Red Spectroscopy (FTIR) respectively. The composite with 30% filler was seen to have optimum thermal stability. The eco-friendliness of the composite gives a better solution to agro-waste disposal rather than burning.

scholarly journals Morphological and thermal properties of composites prepared with poly(lactic acid), poly(ethylene-alt-maleic anhydride), and biochar from microwave-pyrolyzed jatropha seeds

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 3171-3185
Author(s):  
Perry Law Nyuk Khui ◽  
Rezaur Rahman ◽  
Abu Saleh Ahmed ◽  
Kuok King Kuok ◽  
Muhammad Khusairy Bin Bakri ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Thermal Properties ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Filler Content ◽  
Scanning Calorimetry ◽  
Jatropha Seeds ◽  
Properties Of Composites

The morphological and thermal properties of composites containing a bioplastic blend and micro/nano-sized biochar from pyrolyzed jatropha seeds from microwave pyrolyzed jatropha seeds were investigated using scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and differential scanning calorimetry. The biocomposite samples exhibited a brittle structure with a slightly ductile chip-like appearance. The Fourier transform infrared spectroscopy results for the PLA/PEMA/BC bio-composites were comparable to the PLA/BC biocomposites. A lower bio-filler content had more pronounced peak intensities than the higher bio-filler content biocomposites. The added PEMA compatibilizer in the PLA/PEMA/BC biocomposite showed more pronounced peaks, which indicated slightly improved bonding/interaction between the bio-filler and the matrix. Overall, increasing bio-filler content did not drastically affect the functional groups of the biocomposites. Thermogravimetric and differential scanning calorimetry analysis showed the developed biocomposites had a slight improvement in thermal stability, in comparison to the PLA sample. Improvements in the thermal stability of the PLA/PEMA/BC biocomposite could be attributed to the additional hydroxyl group, which was due to the added PEMA in the PLA and PLA/BC. According to the results of the analysis of the developed biocomposites, the biocomposites were more brittle and had reasonable thermal stability.

scholarly journals Conversion of palm oil to new sulfur-based polymer by inverse vulcanization

2021 ◽  
Vol 287 ◽  
pp. 02014
Author(s):  
Amin Abbasi ◽  
Mohamed Mahmoud Nasef ◽  
Wan Zaireen Nisa Yahya ◽  
Muhammad Moniruzzaman
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Thermogravimetric Analysis ◽  
Palm Oil ◽  
Elemental Sulfur ◽  
Molten State ◽  
Scanning Calorimetry ◽  
Environmental Friendly ◽  
Sulfur Containing

The conversion of palm oil into a sulfur-based polymer by copolymerization with sulfur powder at its molten state is herein reported. The obtained sulfur-containing polymer was characterized using Fourier transform infrared (FTIR), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC) to demonstrate the successful conversion. The disappearance of the peaks related to vinylic groups of oil together with the appearance of a peak representing C-H rocking vibrations in the vicinity of C-S bonds confirmed the copolymerization of sulfur with oil. TGA revealed that the polymers have thermal stability up to 230°C under nitrogen and the polymers leave 10% sulfur-rich ash. DSC proved that a small amount of elemental sulfur remained unreacted in the polymer, which showed amorphous and heavily crosslinked structure resembling thermosets. These copolymers are an environmental-friendly polymeric material promoting the utilization of the abundant sulfur while also adding value to palm oil.

scholarly journals Examining the Influence of Re–Used Nanofiller—Pyrolyzed Montmorillonite, on the Thermal Properties of Polypropylene–Based Engineering Nanocomposites

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2636
Author(s):  
Tomasz M. Majka ◽  
Oskar Bartyzel ◽  
Konstantinos N. Raftopoulos ◽  
Joanna Pagacz ◽  
Krzysztof Pielichowski
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Thermogravimetric Analysis ◽  
Control Sample ◽  
Mechanical Analysis ◽  
Scanning Calorimetry ◽  
Stabilization Effect ◽  
Polypropylene Melt ◽  
Better Than

Pyrolysis of the polypropylene/montmorillonite (PP/OMMT) nanocomposites allows for recovery of the filler that can be then re–used to produce PP/pyrolyzed MMT (PMMT) nanostructured composites. In this work, we discuss the thermal properties of PP/PMMT composites investigated by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA). It has been found that effect of PMMT (5 wt. % and 10 wt. %) on matrix thermal stability occurs at temperatures above 300 °C. Addition of 5 wt. % and 10 wt. % of PMMT into polypropylene system gave good stabilization effect, as confirmed by the overall stabilization effect (OSE) values, which increased by 4% and 7%, respectively, compared to the control sample (PP). Interestingly, the presence of 1 wt. % and 3 wt. % of pyrolyzed clay stabilizes the system better than the same concentrations of organoclay added into polypropylene melt. DSC data revealed that pyrolyzed clay has still the same tendency as organoclay to enhance formation of the α and β crystalline PP phases only. The pyrolyzed MMT causes an improvement of the modulus in the glassy as well as rubbery regions, as confirmed by DMA results.

Thermal properties of a series of tetrafunctional fluorene-based oxazines/P-a blends

2016 ◽  
Vol 29 (10) ◽  
pp. 1139-1147 ◽  
Author(s):  
Zi Sang ◽  
Tiantian Feng ◽  
Wenbin Liu ◽  
Jun Wang ◽  
Mehdi Derradji
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Mechanical Analysis ◽  
Proton Nuclear Magnetic Resonance ◽  
Primary Amines ◽  
Resonance Spectroscopy ◽  
High Glass Transition Temperature ◽  
Scanning Calorimetry ◽  
Good Thermal Stability

A new series of aniline and aniline-mixed tetrafunctional fluorene-based oxazine monomers were synthesized using 2,7-hydroxy-9,9-bis-(4-hydroxyphenyl) fluorene, paraformaldehyde, and primary amines (including aniline or aniline mixed with n-butylamine or n-octylamine composition). Fourier transform infrared spectroscopy and proton nuclear magnetic resonance spectroscopy were used to characterize the structure of the monomers. The copolymers were obtained by adding the monomers into a typical monofunctional polybenzoxazine (phenol-aniline-based benzoxazine). Differential scanning calorimetry, thermogravimetric analysis, and dynamic mechanical analysis were performed to study the thermal properties of the copolymers. The copolymers exhibited high glass transition temperature values (164–201°C). A good thermal stability was also obtained with a 5% weight loss temperature over 355°C and high char yields at 800°C (42–50%).

scholarly journals Controlled Release Profile of Imidacloprid-β-Cyclodextrin Inclusion Complex Embedded Polypropylene Filament Yarns

2017 ◽  
Vol 12 (1) ◽  
pp. 155892501701200 ◽  
Author(s):  
Ahmet C. Turan ◽  
İlhan Özen ◽  
Hüsnü K. Gürakın ◽  
Enrico Fatarella
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Inclusion Complex ◽  
High Performance ◽  
Release Profile ◽  
Dissolution Time ◽  
Scanning Calorimetry ◽  
Cyclodextrin Inclusion ◽  
Cyclodextrin Inclusion Complex

Imidacloprid-β-cyclodextrin (IMI-β-CD) inclusion complex was synthesized and effectively incorporated into filament yarns of polypropylene. The physical and thermal properties of IMI-β-CD inclusion complex were determined by Fourier transform infrared spectroscopy, thermogravimetric analysis, and differential scanning calorimetry. According to the results, formation of the inclusion complex was achieved along with enhanced thermal stability. The release profile of imidacloprid was monitored by high-performance chromatography measurements. Dissolution time of the IMI-β-CD inclusion complex was increased to 5 times that of the neat imidacloprid (from 9 h to 48 h). Poylpropylene filament yarns containing 3 wt.% IMI-β-CD inclusion complex released 84 wt.% of IMI within 21 days.

scholarly journals Organic Salts of p-Coumaric Acid and Trans-Ferulic Acid with Aminopicolines

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 751
Author(s):  
Sosthene Nyomba Kamanda ◽  
Ayesha Jacobs
Keyword(s):  
Crystal Structure ◽  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Ferulic Acid ◽  
Hirshfeld Surface ◽  
Coumaric Acid ◽  
Scanning Calorimetry ◽  
Organic Salts ◽  
Thermal Stability Of

p-Coumaric acid (pCA) and trans-ferulic acid (TFA) were co-crystallised with 2-amino-4-picoline (2A4MP) and 2-amino-6-picoline (2A6MP) producing organic salts of (pCA−)(2A4MP+) (1), (pCA̶ )(2A6MP+) (2) and (TFA̶ )(2A4MP+)·( 3 2 H2O) (3). For salt 3, water was included in the crystal structure fulfilling a bridging role. pCA formed a 1:1 salt with 2A4MP (Z’ = 1) and a 4:4 salt with 2A6MP (Z’ = 4). The thermal stability of the salts was determined using differential scanning calorimetry (DSC). Salt 2 had the highest thermal stability followed by salt 1 and salt 3. The salts were also characterised using Fourier transform infrared (FTIR) spectroscopy. Hirshfeld surface analysis was used to study the different intermolecular interactions in the three salts. Solvent-assisted grinding was also investigated in attempts to reproduce the salts.

Effects of physicochemical factors on the secondary structure of β-lactoglobulin

1996 ◽  
Vol 63 (1) ◽  
pp. 97-109 ◽  
Author(s):  
Joyce I. Boye ◽  
Ashraf A. Ismail ◽  
Inteaz Alli
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Secondary Structure ◽  
Random Coil ◽  
Scanning Calorimetry ◽  
Effects Of Ph ◽  
Complementary Techniques ◽  
The Fourier Transform ◽  
Β Lactoglobulin

SummaryFourier transform infrared spectroscopy and differential scanning calorimetry were used as complementary techniques to study changes in the secondary structure of β-lactoglobulin under various physicochemical conditions. The effects of pH (3–9), NaCl (0–2 M), and lactose, glucose and sucrose (100–500 g/l) in the temperature range 25–100 °C on the conformation sensitive amide I band in the i.r. spectrum of β-lactoglobulin in D2O solution were examined. The 1692 cm−1 band in the amide I band profile had not been definitively assigned in previous studies of the i.r. spectrum of β-lactoglobulin. The decrease in this band at ambient temperature with time or upon mild heating was attributed to slow H-D exchange, indicating that it was due to a structure buried deep within the protein. The disappearance of the 1692 cm−1 band on heating was accompanied by the appearance of two bands at 1684 and 1629 cm–1, assigned to β-sheets. The 1692 cm−1 band was therefore attributed to a β-type structure. β-Lactoglobulin showed maximum thermal stability at pH 3 and was easily denatured at pH 9. On denaturation, the protein unfolded into more extensive random coil structures at pH 9 than at pH 3. After 10 h at pH 9 (25 °C), β-lactoglobulin was partly denatured. Heating to 60–80 °C generally resulted in the loss of secondary structure. At all pH values studied, two new bands at 1618 and 1684 cm−1, characteristic of intermolecular β-sheet structure and associated with aggregation, were observed after the initial denaturation. Differential scanning calorimetry studies indicated that the thermal stability of β-lactoglobulin was enhanced in the presence of sugars. The Fourier transform i.r. results obtained provide evidence that sugars promoted the unfolding of β-lactoglobulin via multiple transition pathways leading to a transition state resisting aggregation.

scholarly journals Pengaruh Bentonit terhadap Pembentukan Fasa Polimorf dan Sifat Termal Membran Hibrida Poliviniliden Fluorida/Bentonit

2021 ◽  
Vol 17 (2) ◽  
pp. 177
Author(s):  
Edi Pramono ◽  
Rosid Eka Mustofa ◽  
Ozi Adi Saputra ◽  
Yulianto Adi Nugroho ◽  
Deana Wahyunigrum ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Thermal Properties ◽  
Phase Formation ◽  
Attenuated Total Reflectance ◽  
Hybrid Membranes ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Total Reflectance ◽  
X Ray

<p>Kajian struktur dan degradasi termal pada membran hibrida poliviniliden fluorida (PVDF)/lempung bentonit (BNT) telah dilakukan. Penelitian ini bertujuan mengetahui pengaruh penambahan BNT terhadap pembentukan fasa PVDF dan sifat termalnya. Membran hibrida PVDF/lempung BNT dibuat dengan metode inversi fasa. Membran yang dihasilkan dikarakterisasi dengan <em>attenuated total reflectance fourier transform infrared</em> (ATR-FTIR), <em>x-ray diffraction</em> (XRD), dan <em>differential scanning calorimetry</em> (DSC). Hasil penelitian menunjukkan membran PVDF/BNT memiliki struktur polimorf PVDF fasa α dan β yang terkonfirmasi dari data FTIR dan XRD. Data DSC menunjukkan penurunan nilai titik leleh (Tm) dengan penambahan BNT, dan dengan rentang suhu pelelehan yang lebih kecil. Kristalisasi PVDF terjadi secara isothermal dan adanya BNT menghasilkan titik kristalisasi (Tc) pada suhu yang lebih tinggi dibandingkan membran PVDF murni. Analisis termal dengan DSC memberikan informasi komprehensif pelelehan dan kristalisasi dari polimorf PVDF pada matriks membran.</p><p id="docs-internal-guid-c92edf53-7fff-cf03-76f3-f207f37c74f5" style="line-height: 1.2; text-align: justify; margin-top: 6pt; margin-bottom: 6pt;" dir="ltr"><strong>Effect of Bentonite toward Polymorph Phase Formation and Thermal Properties of Polyvinylidene Fluoride/Bentonite Hybrid Membranes. </strong>The study of the structure and thermal properties of PVDF/bentonite (BNT) hybrid membranes has been carried out. This study aims to determine the effect of BNT addition on the phase formation and thermal properties of the PVDF. In this study, PVDF/BNT hybrid membranes were prepared through the phase inversion method. The resulting membrane was characterized by Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR), x-ray diffraction (XRD), and differential scanning calorimetry (DSC). The results showed that the PVDF/BNT membrane has a PVDF polymorph structure with α and β phases confirmed by FTIR and XRD data. The DSC data showed that the addition of BNT decrease of the melting point (Tm) and with a smaller melting temperature range. PVDF polymorph crystallization occurs isothermally and the presence of BNT produces a crystallization point (Tc) at a higher temperature than pristine PVDF membrane. Thermal analysis with DSC provides comprehensive information on melting and crystallization of PVDF polymorphs in the membrane matrix.</p>

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