scholarly journals Influence of Starch Content on the Thermal and Viscoelastic Properties of Syndiotactic Polypropylene/Starch Composites

2021 ◽  
Vol 11 (3) ◽  
pp. 7228-7232
Author(s):  
N. Ahmad ◽  
F. Ahmad ◽  
I. Alenezi
Keyword(s):  
Melting Point ◽  
Thermal Degradation ◽  
Starch Content ◽  
Thermal Characterization ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Syndiotactic Polypropylene ◽  
Degradation Temperature ◽  
Expansion System ◽  
Thermal Degradation Temperature

In this study, syndiotactic Polypropylene/Starch (sPP/starch) composites were prepared using a solution mixing technique. The thermal characterization was performed using Differential Scanning Calorimetry (DSC), and the melting point was measured for all polymer composites. The thermal degradation temperature was measured using thermal gravimetric analysis. The viscoelastic measurements were performed using the Atomic Rheometric Expansion System (ARES). Both melting point and thermal degradation temperatures were found to decrease with increasing starch content. Moreover, the elastic modulus was found to decrease when the starch content increased.

Synthesis, Characterization and Application of Multi-Generations Hyperbranched Polyurethane Based on Isophorone Diisocyanate

2012 ◽  
Vol 554-556 ◽  
pp. 126-129 ◽  
Author(s):  
Shun Yin ◽  
Ning Sun ◽  
Chun Yun Feng ◽  
Zhi Mou Wu ◽  
Zhao Hua Xu ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Raw Materials ◽  
Degradation Mechanism ◽  
Resonance Spectroscopy ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Isophorone Diisocyanate ◽  
Scanning Calorimetry ◽  
Degradation Temperature ◽  
Hyperbranched Polyurethane

A series of different generation hyperbranched polyurethane(HBPU) was synthesized based on the raw materials of isophorone diisocyanate(IPDI) and diethanolamine(DEOA). Their structure, thermal degradation mechanism and glass transition temperature(Tg) were characterized by fourier transform infrared spectroscopy(FTIR), nuclear magnetic resonance spectroscopy(NMR), thermal gravimetric analysis(TGA) and differential scanning calorimetry(DSC). The results showed that: the yield of each generation HBPU was up to 90%, different generation HBPU had almost the same initial degradation temperature(about at 200°C) and they all had two decomposition platforms; with the increase of generation, Tg increased from 107.2°C to 132.1°C. The gloss and hardness of the HBPU coatings were significantly improved.

scholarly journals Characteristics and mechanical properties changes due to incorporation of aloe vera in polyethylene-based film

2020 ◽  
Vol 17 (2) ◽  
pp. 61
Author(s):  
Siti Fatma Abd Karim ◽  
Junaidah Binti Jai ◽  
Ku Halim Ku Hamid ◽  
Abdul Wafi Abdul Jalil
Keyword(s):  
Mechanical Properties ◽  
Thermal Degradation ◽  
Aloe Vera ◽  
Functional Materials ◽  
Chain Structure ◽  
Substantial Effect ◽  
Scanning Calorimetry ◽  
Degradation Temperature ◽  
And Performance ◽  
The Impact

Non-degradable properties of polyethylene (PE) films due to long-chain structure cause increment of solid waste plastic. Many researchers, with different purposes, have studied the incorporation of functional materials to PE. Studying the impact of incorporation of aloe vera (AV) into PE films in terms of its characteristic and mechanical properties is the main objective of this paper. The films were prepared using melt-blending and hot press technique. The characterization assessed for the PE and PE-AV films were spectroscopy, crystalline phase, thermal analysis and performance of mechanical properties of the sample.  The functional group detected in spectroscopy studied did not show any changes for PE film or PE with the presence of AV. Lower thermal degradation temperature (Td) obtained for PE-AV3 while others film found no significant changes of Td value and only one peak of thermal degradation occurred for all film. The same goes to the analysis obtained from differential scanning calorimetry (DSC) data. However, the crystalline structure displayed momentous peak changes for PE with AV. The highest tensile strength (TS) obtained by PE-AV3, at once developing highest value of Young’s modulus (YM), modulus of resilience (UE) and modulus of toughness (UT). A certain amount of AV has substantial effect on changing the polymeric structure especially improving the mechanical properties of PE film. Therefore, AV has potential to become an additive for developing a new partially degradable PE film.

Synthesis and Characterization of the Bismaleimides Containing Aliphatic-ether Chain for Microelectronics Application

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
J. L. Feng ◽  
C. Y. Yue ◽  
K. S. Chian
Keyword(s):  
Chain Length ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Thermo Gravimetric ◽  
Degradation Temperature ◽  
Dielectric Thermal Analysis ◽  
Aliphatic Ether ◽  
Synthetic Reaction

AbstractThis project aims to develop and characterize a series of bismaleimide (BMI) polymers based on maleic anhydride and aliphatic-ether diamines. The effects of varying the chain length of aliphatic-ether diamines on the resultant bismaleimide systems were evaluated so that their suitability for microelectronics applications could be evaluated. The synthetic reaction and properties of the bismaleimide materials were investigated using Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), Thermo- Gravimetric Analysis (TGA), Dielectric Thermal Analysis (DEA) and rheometry. Results showed that thermal, dielectric and rheological properties were all affected by the main chain length of BMI. The magnitude of the dielectric constant at 100 kHz increases with the increasing chain length. The curing peak temperature, curing heat and degradation temperature of BMI, all decrease with the increasing chain length.

Preparation of epoxy/urethane graft interpenetrating polymer networks and study of mechanical, thermal and morphological properties

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Mehdi Ghafghazi ◽  
Masoud Esfandeh ◽  
Jalil Morshedian
Keyword(s):  
Mechanical Properties ◽  
Polymer Networks ◽  
Weight Ratio ◽  
Interpenetrating Polymer Networks ◽  
Morphological Properties ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Molecular Weights ◽  
Degradation Temperature ◽  
Ft Ir

AbstractThis paper describes the preparation of Epoxy/Urethane (EP/PU) graft interpenetrating polymer networks (g-IPNs) and investigates the effect of EP/PU weight ratio and urethane's prepolymer molecular weight on the mechanical, morphological and thermal properties of the IPN system. Here, g-IPN was prepared by thorough mixing of an isocyanate-terminated urethane prepolymer with an epoxy resin followed by simultaneous curing of the resins. Polytetra hydrofuranate (PTHF), molecular weights (Mw) 1000, 2000 and 3000 g/gmol, was used to prepare urethane prepolymers. EP/PU weight ratios were 75/25, 50/50, 30/70 and 15/85. Disappearance of epoxide and isocyanate functional groups was followed by Fourier Transform Infrared spectroscopy (FT-IR), showing curing of the resins. Differential Scanning Calorimetry (DSC) was used to investigate the glass transition temperature (Tg) of the IPNs. Thermal Gravimetric Analysis (TGA), Dynamic Mechanical Thermal Analysis (DMTA), tensile measurements and Scanning Electron Microscopy (SEM) were used to study thermal, mechanical and morphological properties of the prepared systems. The best mechanical properties were obtained at EP/PU weight ratio 75/25 which also shows a fine and uniformly dispersed morphology. Moreover, at this ratio, with increasing PTHF Mw in the urethane prepolymer, the mechanical properties were improved whereas a decrease was observed in Tg and thermal degradation temperature of g-IPNs.

scholarly journals Thermogravimetric analysis-based characterization of suitable biomass for alkaline peroxide treatment to obtain cellulose and fermentable sugars

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 6217-6229
Author(s):  
Akihiro Hideno
Keyword(s):  
Thermogravimetric Analysis ◽  
Thermal Degradation ◽  
Rice Straw ◽  
Lignin Content ◽  
Cellulose Microfibrils ◽  
Crystalline Cellulose ◽  
Japanese Cypress ◽  
Alkaline Peroxide ◽  
Degradation Temperature ◽  
Thermal Degradation Temperature

To characterize a suitable biomass for alkaline peroxide treatment, four types of lignocellulosic biomass (rice straw, two Miscanthus spp., and Japanese cypress) were characterized using thermogravimetric analysis. Before the alkaline peroxide treatment, rice straw had the lowest initial thermal degradation temperature and Japanese cypress had the highest. After alkaline peroxide treatment, this trend was reversed, such that the highest initial thermal degradation temperature was for alkaline-peroxide treated rice straw. Hemicellulose and lignin content significantly affected the thermal degradation behavior and alkaline peroxide treatment efficiency. Among the four lignocelluloses, raw rice straw exhibited the highest reducing capability, whereas the treated rice straw exhibited the lowest reducing capability. Surface morphology and crystallinity indicated that when the rice straw was subjected to AP treatment at room temperature for 10 min, crystalline cellulose microfibrils were exposed and concentrated on the surface. Thus, among the samples tested, rice straw was found to be the most suitable biomass for alkaline peroxide treatment.

Fabrication of modified-release custom-designed ciprofloxacin tablets via fused deposition modeling 3D printing

2020 ◽  
Vol 4 (1) ◽  
pp. 17-27
Author(s):  
Nasir Abbas ◽  
Nadia Qamar ◽  
Amjad Hussain ◽  
Sumera Latif ◽  
Muhammad Sohail Arshad ◽  
...  
Keyword(s):  
3D Printing ◽  
Drug Release ◽  
Fused Deposition Modeling ◽  
Structural Characteristics ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Ciprofloxacin Hydrochloride ◽  
Fused Deposition ◽  
Degradation Temperature

Aim: The aim of the present work was to fabricate customized tablets of ciprofloxacin hydrochloride through 3D printing for optimized dosing. Materials & methods: A hot melt extrusion technique was employed to produce polyvinyl alcohol filaments with differing strengths of ciprofloxacin hydrochloride. Drug-loaded filaments were characterized for mechanical strength, thermal behavior and structural characteristics prior to printing of tablets by varying the infill percentage. Final formulations were evaluated for drug release profiles. Results: The prepared formulations contained 15–20% drug. The drug release patterns of different formulations were found to be reliant on infill percentage. Differential scanning calorimetry and thermo-gravimetric analysis confirmed that degradation temperature of drug is way above the printing temperature. Conclusion: This work is potentially significant for optimized antibiotic dosing, which in turn leads to enhanced clinical outcome.

A new high performance novolac-based polytriazole resin

2016 ◽  
Vol 30 (1) ◽  
pp. 109-115 ◽  
Author(s):  
Lvyuan Ye ◽  
Liqiang Wan ◽  
Farong Huang
Keyword(s):  
Mechanical Property ◽  
Differential Scanning Calorimetry ◽  
High Performance ◽  
Infrared Analysis ◽  
Good Mechanical Property ◽  
Novolac Resin ◽  
Scanning Calorimetry ◽  
Click Polymerization ◽  
Degradation Temperature ◽  
Thermal Degradation Temperature

A novolac-based polytriazole (NPTA) resin was synthesized using 4,4′-diazidomethylbiphenyl and a propargylated novolac resin through catalyst-free click polymerization. Differential scanning calorimetry and Fourier transform infrared analysis results demonstrate that the NPTA resin can be cured at 80°C. The glass transition temperature of the cured NPTA-88 resin is 202°C. The thermal degradation temperature of the cured NPTA resin is 352°C under nitrogen. The composite of the resin exhibits good mechanical property.

scholarly journals STUDY OF THE KINETICS OF THERMAL DEGRADATION OF UNSATURATED POLYESTER AND POLYESTER/ SILICA NANOPARTICLES COMPOSITES BY TGA AND DSC ANALYSIS TECHNIQUES

2020 ◽  
Vol 17 (35) ◽  
pp. 437-448
Author(s):  
Ahmed Jadah FARHAN
Keyword(s):  
Thermal Stability ◽  
Thermal Degradation ◽  
Silica Nanoparticles ◽  
Thermal Gravimetric Analysis ◽  
Unsaturated Polyester ◽  
Engineering Properties ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Research Activity ◽  
Scanning Calorimetry

Composites are multi-phase materials that have superior engineering properties; the combination of their constituent phases achieves these properties. Nanoparticle-reinforced polymeric composites (NPCs) are new types of composites that have attracted a lot of attention recently and rapidly emerging as a multidisciplinary research activity whose results could widen the applications of polymers to the benefit of many different industries. The aim of research to analyze the effect of adding different percentages (10, 20, and 30%) of silica nanoparticles into unsaturated polyester (UPE) and identification of the thermal stability and decomposition kinetics for them. In this research, the nanocomposites were prepared from unsaturated polyester (UPE) mixed with different percentages (10, 20, and 30%) of silica nanoparticles. Thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) curves were obtained from the thermal degradation computed by using the Coats-Redfern. The kinetic and thermodynamic parameters were studied for all specimens were presented an excellent linear correlation coefficient close to unity using Minitab 16. Experimental work was showed that the degradation of composites obtained from the thermal gravimetric analysis was slower than the pure UPE. The enhancement of thermal stability was attributed to silica content. Also, the result showed that the decomposition under the oxidative environment for the pure UPE was much faster than the inert environment.

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