scholarly journals Study of the Effects of the Structure of Phthalazinone’s Side-Group on the Properties of the Poly(phthalazinone ether ketone)s Resins

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 803 ◽  
Author(s):  
Feng Bao ◽  
Fengfeng Zhang ◽  
Chenghao Wang ◽  
Yuanyuan Song ◽  
Nan Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Thermomechanical Analysis ◽  
Nucleophilic Aromatic Substitution ◽  
Differential Scanning Calorimetry Analysis ◽  
Side Group ◽  
Aromatic Substitution ◽  
Scanning Calorimetry ◽  
Ether Ketone ◽  
Thermal Stability Of

The application of poly(phthalazinone ether ketone)s (PPEKs) resin containing phthalazinone moiety is limited, due to its poor thermoforming processability. To investigate the effects of the phthalazinone’s side-group on the thermal stability and processability of the resin, a series of PPEKs resins with different side-group (–H/–CH3/–Ph) were prepared by nucleophilic aromatic substitution polymerization. The properties of the obtained resins were investigated by differential scanning calorimetry analysis (DSC), thermogravimetric analysis (TGA), dynamic thermomechanical analysis (DMA), and rheogoniometer. The results show that the introduction of methyl or phenyl into the PPEKs resin, significantly reduced the melting viscosity of the resin, but resulted in a slight decrease in the thermal stability of it. This might be due to the presence of methyl or phenyl, which enhanced the free volume of the molecule and reduced the entanglement between the chains; the results of the computer simulation confirmed it. Moreover, the resin films displayed excellent tensile strength with the introduction of methyl or phenyl. In a word, a novel poly(phthalazinone ether ketone)s resin with thermal resistance, easy processing and excellent mechanical properties could be obtained by introducing appropriate bulk-rigid side-groups into the phthalazinone moiety.

Thermal stability of CaCO3/polyethylene (PE) nanocomposites

2019 ◽  
Vol 27 (7) ◽  
pp. 371-382
Author(s):  
S Sahebian ◽  
MT Hamed Mosavian
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Thermal Stability ◽  
Morphological Structure ◽  
Thermomechanical Analysis ◽  
Scanning Calorimetry ◽  
Weight Percentage ◽  
Transmission Electron ◽  
Crystallization Experiments ◽  
Thermal Stability Of

Calcium carbonate (CaCO3) nanoparticles in polymer matrix cause to improvement in polymer performance, including thermal stability and mechanical properties. The main goal of this article is to investigate the effect of different weight percentage of nanoparticles of CaCO3 on thermal stability and mechanical properties of polyethylene (PE) nanocomposites. The morphological structure of CaCO3 nanoparticles and nanocomposites was investigated by transmission electron microscopy and scanning electron microscopy. The thermal stability of PE and its nanocomposites was also determined by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and thermomechanical analysis. Nonisothermal crystallization experiments by DSC test showed that the incorporation of nanoparticles increased the crystallinity, glass transition temperature, and the effective energy barrier for crystallization process. Besides, degradation behavior was evaluated by TGA. The onset mass loss temperature shifted to higher value in the presence of nanoparticles.

The properties of sericin/poly(vinyl alcohol) films modified by boric acid

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Qun Wang ◽  
Lu Qi
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Boric Acid ◽  
Vinyl Alcohol ◽  
Water Resistance ◽  
Poly Vinyl Alcohol ◽  
Scanning Calorimetry ◽  
Blend Ratio ◽  
Percutaneous Drug Delivery ◽  
Thermal Stability Of

AbstractA group of films mainly composed of sericin and poly(vinyl alcohol) (PVA), using boric acid (BA) as a modifier, were prepared by a technique of solution casting. In this work, the effect of BA and sericin on the mechanical properties and water resistance of the films was analyzed, the interior morphology of the films were described by a scanning electron microscopy (SEM), the thermal stability of the films was characterized by differential scanning calorimetry (DSC), and the reaction mechanism was proposed according to the previous literature and the test of Fourier transform infrared spectrum (FTIR). Results indicated that, the properties of the membrane were the functions of the blend ratio of sercin to PVA and the content of BA. The use of BA increased the tensile strength, improved the water resistance and the thermal stability, and varied the interior morphology of the films. The content of sericin greatly influenced the combination of properties of the films, especially the mechanical properties, interior morphology, thermal stability, and water resistance reducing with the increasing of sericin content. The films have potential to be used in materials, such as skin-care coatings for beauty, percutaneous drug delivery systems for exterior intact skin, due to the characteristics of the components and the good mechanical properties of the films.

scholarly journals Dispersibility of Kaolinite-Rich Coal Gangue in Rubber Matrix and the Mechanical Properties and Thermal Stability of the Composites

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1388
Author(s):  
Kenan Zhang ◽  
Hao Zhang ◽  
Linsong Liu ◽  
Yongjie Yang ◽  
Lihui Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Coal Gangue ◽  
Rubber Matrix ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Scanning Calorimetry ◽  
Laser Scattering ◽  
X Ray ◽  
Thermal Stability Of

The aim of this work was to investigate the dispersibility of kaolinite-rich coal gangue in rubber matrix, the mechanical properties and thermal stability of coal gangue/styrene butadiene rubber (SBR) composites, and to compare these properties to those of the same coal gangue but had undergone thermal activation and modification. Several experimental techniques, such as X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric-differential scanning calorimetry (TG-DSC), laser-scattering particle analyzer were adopted to characterize the coal gangue particles and then the obtained composites. The results demonstrated the raw coal gangue (RCG) was mainly composed of kaolinite. Calcination led to amorphization of thermal activated coal gangue (ACG), increased hydrophilicity and void volume, and decreased pH. The grain size of ACG became coarser than RCG, but ACG turned loose confirmed by higher degree of refinement after grinding. Modification enhanced the hydrophobicity of the coal gangue and improved its dispersibility than fillers without modification. Calcined samples had better dispersibility than uncalcined fillers. Additionally, the coal gangue treated by calcinating, grinding and modifying (MGA) had the best dispersion in rubber matrix. Either calcination or modification could improve the mechanical properties and thermal stability of coal gangue filled rubber, while the performance of MGA reinforced SBR (MGA-SBR) was the best. The enhanced performance of the MGA-SBR was owed to better dispersion of particles as well as stronger interactions between particles and rubber macromolecules.

Synthesis and Thermal Stability of Cross-Linked Carbazole-Substituted Poly(dimethylsiloxane) for LED Encapsulation

2013 ◽  
Vol 747 ◽  
pp. 733-736 ◽  
Author(s):  
Nordin Norhuda Hidayah ◽  
Nadras Othman ◽  
Zulkifli Ahmad
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Electronic Device ◽  
Condensation Reaction ◽  
High Thermal Stability ◽  
Differential Scanning Calorimetry Analysis ◽  
Scanning Calorimetry ◽  
Hydrosilylation Reaction ◽  
Thermal Stability Of ◽  
Vinyl Trimethoxysilane

A series of carbazole substituted poly (dimethylsiloxane) (PDMS) was synthesized by hydrosilylation reaction of 9-vinyl carbazole into PDMS structure. It was then cross-linked with vinyl trimethoxysilane by condensation reaction. The fabricated product display increasing in refractive index with increasing carbazole content. The higher carbazole content also produce high thermal stability which is suitable for electronic device encapsulation applications. The modification also increase Tg of the polymers displayed by differential scanning calorimetry analysis. This behavior owe much to the carbazole moeity when it was successfully incorporated into PDMS chain.

scholarly journals Reinforcing 3D print methacrylate resin/cellulose nanocrystal composites: Effect of cellulose nanocrystal modification

BioResources ◽  
2019 ◽  
Vol 14 (2) ◽  
pp. 3701-3716
Author(s):  
Xinhao Feng ◽  
Zhihui Wu ◽  
Yanjun Xie ◽  
Siqun Wang
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Three Dimensional ◽  
Cellulose Nanocrystal ◽  
Resin Composites ◽  
Scanning Calorimetry ◽  
3D Print ◽  
Thermal Gravimetry ◽  
Pyrolytic Temperature ◽  
Thermal Stability Of

Cellulose nanocrystals (CNCs) were modified with methyl methacrylate (MMA) to improve the properties of the resulting three-dimensional (3D) stereolithography printed CNC/methacrylate (MA) resin composites. The dispersibility of the MMA-modified CNCs (MMA-CNCs) was substantially improved, as evidenced by the limited precipitation in the MA solution. Thermal gravimetry and differential scanning calorimetry measurements showed that the pyrolytic temperature of the MMA-CNC was 110 °C higher than that of the CNCs; the pyrolytic temperature and glass transition temperature of the resulting MMA-CNC/MA composites were higher than those of the CNC/MA. The tensile strength and modulus of the MMA-CNC/MA composites were improved by up to 38.3 MPa and 3.07 GPa, respectively, compared to those of the CNC/MA composites. These results demonstrated that the modification of CNC with MMA is a feasible approach to substantially improve the mechanical properties and thermal stability of the resulting MA-based composites.

Thermal Stability of Natural Fibers via Thermoset Coating for Application in Engineering Thermoplastics

2019 ◽  
Vol 809 ◽  
pp. 433-438 ◽  
Author(s):  
Natalie Vellguth ◽  
Tanja Rudeck ◽  
Madina Shamsuyeva ◽  
Franz Renz ◽  
Hans Josef Endres
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Epoxy Resin ◽  
Natural Fiber ◽  
Natural Fibers ◽  
Thermoplastic Composites ◽  
Processing Temperature ◽  
Scanning Calorimetry ◽  
Flax Fibers ◽  
Thermal Stability Of

An effective integration of natural fibers into engineering thermoplastics requires sufficient thermal stability of natural fibers during processing, since melting temperature of engineering thermoplastics lies above 200 °C. The aim of the work was to protect natural fibers from the heat of the molten thermoplastic via coating with a modified epoxy resin, thus enabling manufacture of natural fiber-reinforced engineering thermoplastic composites with minimized thermal degradation of the fibers. Processing temperature comprised the range of engineering thermoplastic polyamide 6 (PA6), which was 225 °C. Flax fabrics were spray coated with partially bio-based epoxy resin and incorporated via hot press technique into a PA6 matrix. The composite samples including spray coated flax fibers as well as the reference flax fibers without coating were characterized with regard to their mechanical properties, namely bending and tensile tests, thermal properties with differential scanning calorimetry (DSC) as well as thermogravimetric analysis (TGA) and optical via scanning electron microscopy (SEM) and computer tomography (CT). The results show that this approach enables manufacture of composites with reproducible mechanical properties, i.e. bending and tensile properties as well as enhanced thermal stabilities.

Effect of modifications of lignin on thermal, structural, and mechanical properties of polypropylene/modified lignin blends

2015 ◽  
Vol 30 (5) ◽  
pp. 625-645 ◽  
Author(s):  
Atul V Maldhure ◽  
Jayant D Ekhe
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Mathematical Models ◽  
Industrial Waste ◽  
Scanning Calorimetry ◽  
Chemical Methods ◽  
Property Data ◽  
Modified Lignin ◽  
Thermal Stability Of ◽  
Good Agreement

Use of organic biomass, industrial waste lignin, was considered interesting due to its easy availability, polymeric nature, and ample scope to modify with an aim to replace conventional metal oxides to achieve improved properties of the blend when blended with polyolefins. To study the effect of chemical modification of lignin on the thermal, structural, and mechanical properties of polypropylene (PP)/modified lignin blends, purified industrial waste lignin was modified by two different chemical methods and blended in various proportions in PP matrix. The thermal stability of the blends was studied by thermogravimetric analysis, whereas melting and crystallization behavior of blends was studied by non-isothermal differential scanning calorimetry. The results show improved thermal stability of blends with increasing modified lignin proportion in the PP matrix. More depression in melting point was observed in PP/alkylated lignin blends than PP/arylated lignin blends, whereas addition of alkylated lignin shows polymorphism in PP matrix. Intermolecular interactions between blend components have been evaluated by applying several mathematical models to experimental mechanical property data. In most of the cases, good agreement has been obtained between the predictions made by using mathematical models and interpretations done on the basis of experimental data, showing the suitability of these models for predicting the mechanical properties of PP/modified lignin blends.

Novel poly(aryl ether ketone)s with anthracene in the backbone

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Na Ying ◽  
Zhang Haibo ◽  
Zhang Yunhe ◽  
Niu Yaming ◽  
Jiang Sibo ◽  
...  
Keyword(s):  
Nitrogen Atmosphere ◽  
Nucleophilic Aromatic Substitution ◽  
Aromatic Substitution ◽  
Aryl Ether ◽  
Scanning Calorimetry ◽  
Good Thermal Stability ◽  
Good Solubility ◽  
Aryl Ether Ketone ◽  
Ether Ketone ◽  
First Time

AbstractTwo novel poly (aryl ether ketone)s with anthracene moieties in the backbone were synthesized through the conventional nucleophilic aromatic substitution polycondensation for the first time, by using a new bisfluoro monomer, 9,10-bis(4-fluorobenzoyl) anthracene (AnBF). The structures of obtained polymers were confirmed by NMR, IR and UV characterizations. The polymers have high molecular weight and show good solubility in common organic solvents. Differential Scanning Calorimetry (DSC) indicates that they are vitrified polymers with high glass transition temperatures above 188° Thermogravimetric analysis (TGA) shows that these polymers have good thermal stability in nitrogen atmosphere with a 5% weight loss (TGA-5%) above 465°.

scholarly journals Role of different lignin systems in polymers: mechanical properties and thermal stability

2020 ◽  
Vol 22 (4) ◽  
pp. 10-16
Author(s):  
Gvlmira Hasan ◽  
Dilhumar Musajan ◽  
Gong-bo Hou ◽  
Mingyu He ◽  
Ying Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Induction Time ◽  
Crystallization Rate ◽  
Scanning Calorimetry ◽  
Oxidation Induction Time ◽  
Thermal Stability Of

AbstractLignin was used to study the mechanical properties and thermal stability of polymers. The lignin was blended with three kinds of polymers, and the addition of lignin was 0.5 wt%. Under the condition of thermal oxidation, the thermal stability of lignin/polymer samples varies with the structure of lignin. The effects of lignin on the mechanical properties and thermal stability of the polymers were investigated by oxidation induction time (OIT), rheological properties, mechanical properties and differential scanning calorimetry (DSC). The results show that the effect of lignin on the thermal properties of polymer samples is 2~3°C. It can be inferred that lignin can effectively improve the interaction between polymer molecular chain segments, and improve the crystallization rate and rigidity to a certain extent, so it can be seen that lignin has good compatibility and thermal stability.

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