Thermal Stability Determination, Anti-Biodegradation, and Thermal Degradation of Nitrocellulose with Various Nitrogen Content by DSC and FT-IR

2011 ◽  
Vol 189-193 ◽  
pp. 1417-1420 ◽  
Author(s):  
Yung Chuan Chu ◽  
Fang Chang Tsai ◽  
Wei Ting Chen ◽  
Lung Chang Tsai ◽  
Chi Min Shu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Thermal Degradation ◽  
Functional Group ◽  
Fungal Growth ◽  
Thermal Conditions ◽  
Scanning Calorimetry ◽  
Ft Ir ◽  
Functional Group Transformation

This study fully exploited the advantages of the similarities between chitosan and nitrocellulose (NC), their non-toxicity, superior germproof effects, and the characteristic of restraining fungal growth, to prevent NC’s biodegradation. In a comparison between NC’s Ea, the differences among them were dealt with or not with germproof chitosan by differential scanning calorimetry (DSC). We also observed specific functional groups with Fourier transform infrared (FT-IR) spectrometer to characterize the functional group transformation of NC under various thermal conditions.

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 Swelling properties of chitosan hydrogels

2004 ◽  
Vol 22 (1) ◽  
pp. 32 ◽  
Author(s):  
David R Rohindra ◽  
Ashveen V Nand ◽  
Jagjit R Khurma
Keyword(s):  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Glass Transition ◽  
Free Water ◽  
Scanning Calorimetry ◽  
Swelling Behaviour ◽  
Swelling Properties ◽  
Different Temperatures ◽  
Ft Ir ◽  
Chitosan Hydrogels

Chitosan hydrogels were prepared by crosslinking chitosan with glutaraldehyde. The swelling behaviour of the crosslinked and uncross-linked hydrogels was measured by swelling the gels in media of different pH and at different temperatures. The swelling behavior was observed to be dependent on pH, temperature and the degree of crosslinking. The gel films were characterized by Fourier transform Infrared spectroscopy (FT-IR) and Differential Scanning Calorimetry (DSC). The glass transition temperature (Tg) and the amount of free water in the hydrogels decreased with increasing crosslinking in the hydrogels.

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 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 Effect of tartaric acid on conformation and stability of human prostatic phosphatase: an infrared spectroscopic and calorimetric study.

2001 ◽  
Vol 48 (3) ◽  
pp. 755-762 ◽  
Author(s):  
S Bem ◽  
W S Ostrowski
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Tartaric Acid ◽  
Solution Structure ◽  
Prostatic Acid Phosphatase ◽  
Thermal Unfolding ◽  
Calorimetric Study ◽  
Scanning Calorimetry ◽  
Thermal Stability Of

The solution structure and thermal stability of human prostatic acid phosphatase (hPAP) in the absence and in the presence of tartaric acid were studied by Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). The temperature dependence of the infrared spectrum and DSC scans indicate that hPAP undergoes thermal unfolding at a temperature between 49.5 and 52.5 degrees C. Binding of tartaric acid does not lead to major changes in the secondary structure of hPAP, however, hPAP with bound tartaric acid shows a significantly increased thermal stability. These results helped to better understand the mechanism of hPAP unfolding at the elevated temperature.

scholarly journals Pembentukan Kokristal Asam Usnat – N-Methyl-DGlucamine dengan Metode Penguapan Pelarut dan Pengaruhnya terhadap Penurunan Interleukin-8 pada Tikus Inflamasi

2020 ◽  
Vol 7 (1) ◽  
pp. 23
Author(s):  
Muthia Fadhila ◽  
Salman Umar ◽  
Erizal Zaini
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Interleukin 8 ◽  
Scanning Calorimetry ◽  
Ft Ir ◽  
Scanning Electron

Pada penetitian ini pembentukan kokristal asam usnat-N-methyl-D-glucamine bertujuan untuk meningkatkan kelarutan dan laju disolusi asam usnat serta uji efektivitasnya dalam kadar IL-8 pada tikus inflamasi. Kokristal asam usnat–N-methyl-D-glucamine dibuat dengan perbandingan 1:1 ekuimola dengan metode penguapan pelarut menggunakan etanol. Karakterisasi sampel dilakukan dengan difraksi sinar-X, Differential Scanning Calorimetry (DSC), Fourier Transform Infrared (FTIR), dan Scanning Electron Microscopy (SEM). Evaluasi kokristal yang dilakukan mencakup uji kelarutan, uji laju disolusi, dan penentuan kadar interleukin-8 (IL-8) pada tikus inflamasi. Uji kelarutan dilakukan menggunakan pelarut air suling bebas CO2 sedangkan uji laju disolusi menggunakan media air suling bebas CO2 0.25% (b/v) sodium lauril sulfat (SLS), kedua larutan uji dianalisis menggunakan spektrofotometer UV-Vis. Pemeriksaan IL-8 tikus inflamasi menggunakan metode ELISA. Hasil karakterisasi difraksi sinar-X menunjukkan profil difraktogram yang berbeda dari komponen penyusun yang mengindikasikan terbentuknya fase kokristal. Hasil termogram DSC menunjukkan adanya puncak endotermik baru yang berbeda dengan kedua komponen penyusun. Spektrum FT-IR menunjukkan terjadinya pergeseran bilangan gelombang pada spektrum kokristal dibandingkan spektrum asam usnat dan N-methyl-D-glucamine. Analisis SEM menunjukkan perubahan morfologi partikel. Kelarutan dan laju disolusi kokristal meningkat secara signifikan (P<0,05) sebanyak 24 kali dan 23 kali dibandingkan dengan senyawa asam usnat murni. Kokristal dapat menurunkan kadar IL-8 pada tikus inflamasi yang setara dengan aktivitas antiinflamasi asetosal (P<0,05). Disimpulkan bahwa koristal asam usnat - N-methyl-D-glucamine dapat meningkatkan kelarutan, laju disolusi, dan menurunkan kadar IL-8 tikus inflamasi.

Analysis of Novel Structure of EVA/Hemp Stem Powder Foam Materials

2012 ◽  
Vol 627 ◽  
pp. 651-654
Author(s):  
Xin Min Hao ◽  
Wen Juan Ma ◽  
Ge Gan ◽  
Peng Cheng Zhao ◽  
Yuan Yang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Ethylene Vinyl Acetate ◽  
Compound System ◽  
Scanning Calorimetry ◽  
Novel Structure ◽  
Ft Ir ◽  
Scanning Electron

This paper introduces the study of structure on EVA (ethylene-vinyl acetate)/hemp stem powder compound system. The micro behavior of EVA/hemp system was measured by SEM (Scanning Electron Microscopy), and its thermal properties were measured by DSC (Differential Scanning Calorimetry ). It indicates that hemp stem core has entered into EVA foaming system successfully when measured by FT-IR (Fourier Transform Infrared).

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