scholarly journals Studies of properties of polypropylene/halloysite composites

2011 ◽  
Vol 13 (3) ◽  
pp. 61-65 ◽  
Author(s):  
Agnieszka Szczygielska ◽  
Jacek Kijeński
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Polymer Composites ◽  
Degree Of Crystallinity ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
Polypropylene Composites ◽  
Modification Method ◽  
The Degree Of Crystallinity

Studies of properties of polypropylene/halloysite compositesThe results of the studies on the synthesis, mechanical and thermal properties of polypropylene composites with various amount of halloysite filler are presented. Halloysite (HNT) belongs to the silica type characterized by a two-layer 1:1 structure. This work was aimed to develop a method for the modification of halloysite in its prime use as a filler for polypropylene by extrusion. The composites contain 1, 3, 5 and 7 wt.% of HNT. The degree of crystallinity of the composites decrease with increasing halloysite content. The results confirm the expectations that composites of interesting physicochemical, mechanical and thermal properties can be obtained. The mechanical properties studied show that the filler modification method used leads to the synthesis of polymer composites of improved thermal and mechanical properties.

scholarly journals LMPP Effects on Morphology, Crystallization, Thermal and Mechanical Properties of iPP/LMPP Blend Fibres

2018 ◽  
Vol 26 (2(128)) ◽  
pp. 26-31 ◽  
Author(s):  
Munir Hussain ◽  
Feichao Zhu ◽  
Feichao Zhu ◽  
Bin Yu ◽  
Bin Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Elastic Modulus ◽  
Isotactic Polypropylene ◽  
Degree Of Crystallinity ◽  
Thermal And Mechanical Properties ◽  
Elongation At Break ◽  
Breaking Elongation ◽  
Low Modulus ◽  
The Degree Of Crystallinity

The thermal properties and morphological characterisation of isotactic polypropylene (iPP) homopolymer and its blends with low molecular low modulus polypropylene (LMPP) were studied. Firstly blends were prepared with variant LMPP contents, and their properties were characterised using SEM, DSC, XRD, and DMA. Later the mechanical properties of iPP/LMPP blend fibres were investigated. SEM results showed that the iPP/LMPP blends produced smoother surfaces when the LMPP content was increased, as well as the miscibility. All the Tg values with different LMPP percentages were in-between pure iPP and LMPP. The XRD results indicated the LMPP percentage decreased along with the degree of crystallinity of the iPP/LMPP blends (5% to 15%), which increased and then decreased as compared to pure iPP. The elongation at break increased when the LMPP content increased, with the maximum breaking elongation of the LMPP 25% blend reaching 12.95%, which showed great stretch-ability, whereas the elastic modulus of iPP/LMPP blends decreased.

Mechanical and thermal properties of PP/compatibilized PP/acid treated SWNTs nanocomposites: Effect of different acid treatment times

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Morteza Ghorbanzadeh Ahangari ◽  
Abdolhosein Fereidoon ◽  
Seyfolah Saedodin
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Acid Treatment ◽  
Treatment Process ◽  
Tensile Tests ◽  
Acid Mixture ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
Maleated Polypropylene ◽  
Carboxylic Groups

AbstractIn the present work, the effect of different acid treatment times of singlewalled carbon nanotubes (SWNTs) on the mechanical and thermal properties of polypropylene (PP)/maleated polypropylene (PP-g-MA) nanocomposites was investigated. The acid treatment process was based on a mixture of concentrated sulphuric and nitric acids. The SWNTs were treated with the acid mixture for 1, 3, and 6 h. FTIR, Raman spectroscopy and TEM revealed the values of carboxylic groups, graphitization and morphology of acid treated SWNTs, respectively. The thermal and mechanical properties and the morphology of nanocomposites were investigated by tensile tests, DMTA, DSC, and SEM.

scholarly journals Effect of PVA-co-MMA Copolymer on the Physical, Mechanical, and Thermal Properties of Tropical Wood Materials

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Md. Saiful Islam ◽  
Sinin Hamdan ◽  
Mansor B. Ahmad ◽  
Mahbub Hasan ◽  
Azman Hassan ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Sem Analysis ◽  
Degree Of Crystallinity ◽  
Mechanical And Thermal Properties ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
Tropical Wood ◽  
Wood Polymer ◽  
Wood Polymer Composites ◽  
The Degree Of Crystallinity

The present study demonstrates the effect of copolymer on the physical, mechanical, and thermal properties of tropical wood and wood polymer composites (WPCs). Mixed monomers of methyl methacrylate (MMA) and polyvinyl alcohol (PVA) were effectively impregnated into the cellular structure of several types of tropical wood, which then underwent a catalyst-thermal process to polymerize and form WPC. The manufacturing of WPC was confirmed through Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopic (SEM) analysis. The SEM observation showed that polymer converted from monomers filled up wood cell cavities and tightly interacted with wood matrix. The X-ray diffraction results reveal that the degree of crystallinity was significantly improved upon impregnation with PVA-co-MMA copolymer. The modulus of elasticity (MOE) and compressive modulus were found to be significantly higher after treatment with MMA/PVA indicating improvement of mechanical properties of the wood samples. In addition, the modified WPC had lower water absorption compared to their corresponding raw samples. It is interesting to note that thermogravimetric (TGA) analysis shows an extensive improvement in thermal properties of WPC.

scholarly journals Mechanical and thermal properties of tungsten carbide – graphite nanoparticles nanocomposites

2016 ◽  
Vol 18 (2) ◽  
pp. 84-88 ◽  
Author(s):  
Kamil Kornaus ◽  
Agnieszka Gubernat ◽  
Dariusz Zientara ◽  
Paweł Rutkowski ◽  
Ludosław Stobierski
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Properties ◽  
Tungsten Carbide ◽  
Bending Strength ◽  
Polycrystalline Materials ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
Pure Tungsten ◽  
Graphite Nanoparticles

Abstract Previous studies concerning pure tungsten carbide polycrystalline materials revealed that nanolayers of graphite located between WC grains improve its thermal properties. What is more, pressure-induced orientation of graphene nano platelets (GNP) in hot pressed silicon nitride-graphene composites results in anisotropy of thermal conductivity. Aim of this study was to investigate if addition of GNP to WC will improve its thermal properties. For this purpose, tungsten carbide with 0.5–6 wt.% of GNP(12)-additive underwent hot pressing. The microstructure observations performed by SEM microscopy. The anisotropy was determined via ultrasonic measurements. The following mechanical properties were evaluated: Vickers hardness, bending strength, fracture toughness KIc. The influence of GNP(12) addition on oxidation resistance and thermal conductivity was examined. It was possible to manufacture hot-pressed WC-graphene composites with oriented GNP(12) particles, however, the addition of graphene decreased both thermal and mechanical properties of the material.

scholarly journals Mechanical and Thermal Properties of RCB Masonry Containing Three Rows of Holes

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Hanquan Yuan ◽  
Lihua Zhu ◽  
Yixuan Wang ◽  
Fengjian Zhang
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Thermal Property ◽  
Theoretical Calculations ◽  
Failure Process ◽  
Concrete Block ◽  
Recycled Concrete ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
The Difference

In order to promote and apply the structures of the recycled concrete block (RCB) masonry, the thermal and mechanical properties of the recycled concrete specimens were tested in this study. The RCB can meet load-bearing and seismic requirements and was prepared through experiments. Concurrently, the mechanical property experiment was conducted on the RCB masonry, and then its failure process and mode were discussed. In addition, a thermal property test was completed on the RCB wall, and the difference in the thermal properties of single-row hole, three-row hole, and solid blocks was analyzed by theoretical calculations. The results indicated that the mechanical properties of the RCB masonry were basically the same as those of the natural concrete block masonry, and they have good compressive stability. The calculation formulas of the compressive and shear strengths of the natural concrete block masonry are applicable to the RCB masonry. The RCB masonry containing three rows of holes owns more outstanding thermal property than natural concrete block masonry and satisfies the requirements for related codes.

scholarly journals Effect of UV-Irradiation and Ozone Exposure on Thermal and Mechanical Properties of PLA/LDPE Films

2022 ◽  
Author(s):  
M. Podzorova
Keyword(s):  
Mechanical Properties ◽  
Ozone Exposure ◽  
Degree Of Crystallinity ◽  
Thermal And Mechanical Properties ◽  
Strength Parameters ◽  
Thermophysical Characteristics ◽  
Scanning Calorimetry ◽  
Wide Range ◽  
The Degree Of Crystallinity ◽  
Range Of Values

Abstract. The mechanical properties of polymer composites based on polylactide vary significantly over a wide range of values. It has been established that photodegradation of low-density polyethylene – polylactide blends occurs both in the amorphous and in the crystalline phase of the PLA matrix, which leads to deterioration of the mechanical properties of the studied mixtures. Ozonolysis affects the strength parameters of polylactide-polyethylene samples as well as photodegradation. By the differential scanning calorimetry it is determined that the melting point of polylactide decreases by 2-4 °C, the glass transition temperature - by 1-3 °C, while the degree of crystallinity increases by 3-6%. In the process of ozonolysis, the thermophysical characteristics of PLA/LDPE have changed.

scholarly journals Orientation of Polylactic Acid–Chitin Nanocomposite Films via Combined Calendering and Uniaxial Drawing: Effect on Structure, Mechanical, and Thermal Properties

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3308
Author(s):  
Shikha Singh ◽  
Mitul Kumar Patel ◽  
Shiyu Geng ◽  
Anita Teleman ◽  
Natalia Herrera ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Solid State ◽  
Nanocomposite Films ◽  
Degree Of Crystallinity ◽  
Poly Lactic Acid ◽  
Mechanical And Thermal Properties ◽  
Orientation Factor ◽  
Crystallinity Degree ◽  
Positive Effects

The orientation of polymer composites is one way to increase the mechanical properties of the material in a desired direction. In this study, the aim was to orient chitin nanocrystal (ChNC)-reinforced poly(lactic acid) (PLA) nanocomposites by combining two techniques: calendering and solid-state drawing. The effect of orientation on thermal properties, crystallinity, degree of orientation, mechanical properties and microstructure was studied. The orientation affected the thermal and structural behavior of the nanocomposites. The degree of crystallinity increased from 8% for the isotropic compression-molded films to 53% for the nanocomposites drawn with the highest draw ratio. The wide-angle X-ray scattering results confirmed an orientation factor of 0.9 for the solid-state drawn nanocomposites. The mechanical properties of the oriented nanocomposite films were significantly improved by the orientation, and the pre-orientation achieved by film calendering showed very positive effects on solid-state drawn nanocomposites: The highest mechanical properties were achieved for pre-oriented nanocomposites. The stiffness increased from 2.3 to 4 GPa, the strength from 37 to 170 MPa, the elongation at break from 3 to 75%, and the work of fracture from 1 to 96 MJ/m3. This study demonstrates that the pre-orientation has positive effect on the orientation of the nanocomposites structure and that it is an extremely efficient means to produce films with high strength and toughness.

scholarly journals Evaluation of the types of starch for preparation of LDPE/starch blends

2007 ◽  
Vol 50 (3) ◽  
pp. 361-370 ◽  
Author(s):  
Glória Maria Vinhas ◽  
Suzana Moreira de Lima ◽  
Lívia Almeida Santos ◽  
Maria Alice Gomes de Andrade Lima ◽  
Yêda Medeiros Bastos de Almeida
Keyword(s):  
Mechanical Properties ◽  
Cellular Growth ◽  
Degree Of Crystallinity ◽  
Thermal And Mechanical Properties ◽  
Different Types ◽  
Before And After ◽  
Starch Blends ◽  
Short Time ◽  
Physical And Chemical ◽  
The Degree Of Crystallinity

This study evaluated in relation the growth, and the amylolytic activity of mixed and isolated cultures of Phanerochaete chrysosporium and Talaromyces wortmanni on different types of starch. The thermal and mechanical properties in polyethylene/starch blends (proportion: 80/20 (w/w) before and after inoculation of the mixed cultures were evaluated. The regular starch Amidex 3 and the modified starch Fox5901 stood out in relation to the cellular growth and production of the amylase enzyme. In spite of the short time that the blends were exposed to the fungi, the microorganisms promoted physical and chemical changes in the structure of the blend, modifying its thermal and mechanical properties. The alteration of the degree of crystallinity and mechanical properties of the blends could be indications of the modification caused by the biodegradation process.

scholarly journals Preparation of unsaturated polyester/nano ceramic composite and study electric, thermal and mechanical properties

2018 ◽  
Vol 15 (35) ◽  
pp. 188-201
Author(s):  
Shatha H. Mahdie
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Room Temperature ◽  
Ceramic Composite ◽  
Unsaturated Polyester ◽  
Mechanical And Thermal Properties ◽  
Electrical Characteristics ◽  
Thermal And Mechanical Properties ◽  
Fill Ratio

The composites were manufactured and study the effect of addition of filler (nanoparticles SiO2 treated with silane) at different weight ratios (1, 2, 3, 4 and 5) %, on electrical, mechanical and thermal properties. Materials were mixed with each other using an ultrasound, and then pour the mixture into the molds to suit all measurements. The electrical characteristics were studied within a range of frequencies (50-1M) Hz at room temperature, where the best results were shown at the fill ratio (1%), and thermal properties at (X=3 %), the mechanical properties at the filler ratio (2%).

Mechanical and Thermal Properties

2016 ◽  
pp. 602-624
Author(s):  
Noémi S. Müller
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Material Properties ◽  
Thermal Shock Resistance ◽  
Test Methods ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
Archaeological Ceramics ◽  
Shock Resistance ◽  
Manufacturing Parameters

This chapter provides an introduction to mechanical and thermal properties of archaeological ceramics, which are of importance for a ceramic’s affordances and affect its suitability to be used in different activities. An overview of thermal and mechanical properties, namely fracture strength and fracture energy (toughness), thermal shock resistance and thermal conductivity, is provided, outlining the underlying principles of these properties and test methods typically used to measure them. Emphasizing the importance of potter’s choices during manufacture on the finished products’ material properties, the influence of different manufacturing parameters, in particular firing and tempering strategies, is discussed and underlying principles and mechanisms, which are applicable to a wide variety of commonly encountered archaeological ceramics, are elucidated.

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