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.

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.

Study on Preparation and Properties of PA6/TiO2-GO Composites

2020 ◽  
Vol 1001 ◽  
pp. 224-228
Author(s):  
Dan Liu
Keyword(s):  
Mechanical Properties ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Breaking Strength ◽  
Degree Of Crystallinity ◽  
Methylene Blue Solution ◽  
Elongation At Break ◽  
Increasing Trend ◽  
Blue Solution ◽  
The Degree Of Crystallinity

In this paper, the effect of nanoTiO2 content on the thermal properties, mechanical properties, photocatalytic properties of PA6/TiO2-GO composites were investigated. The results indicated that the melting point of the composites decreased gradually with an increase of nanoTiO2 content, and the degree of crystallinity exhibited an increasing trend at first and then tended to decrease. Meanwhile, the breaking strength decreased gradually, whereas the elongation at break increased gradually. Moreover, the nanoTiO2 exhibited an increasing photocatalytic activity for degradation of the methylene blue solution. The incorporation of graphene oxide (GO) could effectively improve the photocatalytic effectiveness of nanoTiO2 by approximately 11%.

Investigating the Limiting Mechanical Properties of Nanocomposites Based on High-Density Polyethylene

2017 ◽  
Vol 44 (12) ◽  
pp. 47-52
Author(s):  
N.S. Dikanova ◽  
A.V. Matseevich ◽  
O.V. Kovriga ◽  
A.A. Askadskii ◽  
T.P. Kravchenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
High Density Polyethylene ◽  
High Density ◽  
Degree Of Crystallinity ◽  
Elasticity Limit ◽  
Multiwalled Nanotubes ◽  
Twofold Increase ◽  
The Given ◽  
The Degree Of Crystallinity

The effects of nanotubes and modifiers on the elastic modulus and forced elasticity limit of high-density polyethylene were studied. It was found that a very low concentration of multiwalled nanotubes (0.1 wt%) leads to a considerable (twofold) increase in the elastic modulus and a certain increase in the forced elasticity limit. This is connected with the experimentally found increase in the degree of crystallinity of polyethylene when it is filled with the given nanoparticles.

scholarly journals PLA Electrospun Fibers Reinforced with Organic and Inorganic Nanoparticles: A Comparative Study

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4925
Author(s):  
Adrián Leonés ◽  
Valentina Salaris ◽  
Alicia Mujica-Garcia ◽  
Marina P. Arrieta ◽  
Daniel Lopez ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silver Nanoparticles ◽  
Point Of View ◽  
Inorganic Nanoparticles ◽  
Degree Of Crystallinity ◽  
Poly Lactic Acid ◽  
Electrospun Fibers ◽  
Thermal And Mechanical Properties ◽  
Elongation At Break ◽  
Grafting From

In this work, different poly (lactic acid) (PLA)-based nanocomposite electrospun fibers, reinforced with both organic and inorganic nanoparticles, were obtained. As organic fibers, cellulose nanocrystals, CNC, both neat and functionalized by “grafting from” reaction, chitosan and graphene were used; meanwhile, hydroxyapatite and silver nanoparticles were used as inorganic fibers. All of the nanoparticles were added at 1 wt% with respect to the PLA matrix in order to be able to compare their effect. The main aim of this work was to study the morphological, thermal and mechanical properties of the different systems, looking for differences between the effects of the addition of organic or inorganic nanoparticles. No differences were found in either the glass transition temperature or the melting temperature between the different electrospun systems. However, systems reinforced with both neat and functionalized CNC exhibited an enhanced degree of crystallinity of the electrospun fibers, by up to 12.3%. From a mechanical point of view, both organic and inorganic nanoparticles exhibited a decreased elastic modulus and tensile strength in comparison to neat electrospun PLA fibers, improving their elongation at break. Furthermore, all of the organic and inorganic reinforced systems disintegrated under composting conditions after 35 days.

Preparation of photochromic isotactic polypropylene filaments: influence of drawing ratio on their optical, thermal and mechanical properties

2020 ◽  
Vol 90 (19-20) ◽  
pp. 2136-2148 ◽  
Author(s):  
Aravin Prince Periyasamy ◽  
Martina Viková ◽  
Michal Vik
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Isotactic Polypropylene ◽  
Experimental Work ◽  
Metallocene Catalyst ◽  
Pigment Concentration ◽  
Drawing Ratio ◽  
Thermal And Mechanical Properties ◽  
Lamella Thickness ◽  
The Impact

In this research, metallocene catalyst isotactic polypropylene (miPP) filaments were produced with different concentrations of photochromic pigments to develop ultraviolet (UV) sensing materials. The produced miPP filaments showed good photochromic response under UV irradiation. In this work, six drawing ratios were applied to get the final product (miPP filament). Resultant filaments showed significant photochromic responses, such as Kubelka–Munk values ( K/ S). The interesting observation was that the photochromic response was indirectly proportional to the applied drawing ratio. The photochromic color build was found to be maximum with the highest concentration of pigment as well as the lowest drawing ratio. Overall, it was observed that the thermal properties were significantly dependent on the drawing ratio. The changes in thermal properties, such as T m, ΔH m and ΔS m, for miPP filaments in dependence on photochromic pigment concentration was significantly less as compared to the drawing ratios. The thermal properties improved with the drawing ratio, which directly influenced the crystallinity of produced miPP filaments. The addition of photochromic pigment to the miPP filaments increased the crystallinity by 14%. Also, the lamella thickness increased with increasing the drawing ratio. However, there was no significant effect of pigment concentration on lamella thickness. In this experimental work, the impact of drawing ratio on the optical, thermal and mechanical properties of photochromic miPP filaments was investigated.

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 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.

Study on the Structure and Properties of Natural Color Silk Treated by Alkali

2011 ◽  
Vol 175-176 ◽  
pp. 760-764 ◽  
Author(s):  
Kai Jing ◽  
Yun Zhang ◽  
Xiang Rong Wang
Keyword(s):  
Mechanical Properties ◽  
Sodium Hydroxide ◽  
Young’S Modulus ◽  
Sodium Carbonate ◽  
Young's Modulus ◽  
Degree Of Crystallinity ◽  
Structure And Properties ◽  
Breaking Elongation ◽  
Natural Color ◽  
The Degree Of Crystallinity

The natural color silk has been treated by sodium hydroxide and sodium carbonate，and the structure, crystallize and mechanical properties of the treated natural color silk were studied. The results showed that the structure of natural color silk was not changed and the degree of crystallinity decreased; the crystallinity of un-treated natural color silk was 44.4%, while the crystallinities of natural color silk treated by sodium hydroxide and sodium carbonate were 35.2% and 43.6%, respectively. The breaking tenacity and the breaking elongation of natural color silk treated by sodium hydroxide dropped dramatically and the Young’s Modulus declined; but these properties of natural color silk were not changed significantly after being treated by sodium carbonate.

Thermal and mechanical properties of biodegradable isotactic polypropylene

2020 ◽  
pp. 089270572096352
Author(s):  
Yousef Ahmad Mubarak
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Yield Strength ◽  
Young’S Modulus ◽  
Isotactic Polypropylene ◽  
Young's Modulus ◽  
Biodegradable Plastic ◽  
Thermal And Mechanical Properties ◽  
Elongation At Break ◽  
The Impact

In this study, the effects of two different biodegradable plastic additives on the thermal and mechanical properties of isotactic polypropylene were investigated, analyzed, and presented. Biosphere biodegradable plastic additive and another oxidative biodegradable plastic additive, D2W, were used in 0.25, 0.5, 1.0, 1.5, and 2.0 wt% to prepare two sets of isotactic polypropylene composites. Differential scanning calorimeter and optical polarized light microscope were used to analyze the obtained composites thermally while the mechanical properties of these composites were studied by conducting tensile and impact testing. The morphological results reveal that only monoclinic α spherulites were obtained when the polypropylene crystallizes isothermally from the melt, it was found that both biodegradable plastic additives used decreases the size of the spherulites and increases their densities per unit volume. The incorporation of the Biosphere within the polypropylene matrix raises the crystallization temperature while the existence of D2W within the matrix delays the crystallization process. The addition of 2 wt% of Biosphere allows polypropylene to crystallize at about 13°C higher than neat polypropylene. It has been found that the addition of the biosphere increases Young’s modulus, while decreases the yield strength, the elongation at break, and the impact strength. On the other hand, D2W as an oxidative biodegradable plastic additive increases the elongation at break and the impact strength while decreases the yield strength and Young’s modulus.

scholarly journals Effect of Organic Modifier Types on the Physical–Mechanical Properties and Overall Migration of Post-Consumer Polypropylene/Clay Nanocomposites for Food Packaging

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1502
Author(s):  
Eliezer Velásquez ◽  
Sebastián Espinoza ◽  
Ximena Valenzuela ◽  
Luan Garrido ◽  
María José Galotto ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Food Packaging ◽  
Clay Nanocomposites ◽  
Organic Modifier ◽  
Thermal And Mechanical Properties ◽  
Chemical Safety ◽  
Elongation At Break ◽  
Fatty Food ◽  
Recycled Plastics ◽  
Thermal Stability Of

The deterioration of the physical–mechanical properties and loss of the chemical safety of plastics after consumption are topics of concern for food packaging applications. Incorporating nanoclays is an alternative to improve the performance of recycled plastics. However, properties and overall migration from polymer/clay nanocomposites to food require to be evaluated case-by-case. This work aimed to investigate the effect of organic modifier types of clays on the structural, thermal and mechanical properties and the overall migration of nanocomposites based on 50/50 virgin and recycled post-consumer polypropylene blend (VPP/RPP) and organoclays for food packaging applications. The clay with the most hydrophobic organic modifier caused higher thermal stability of the nanocomposites and greater intercalation of polypropylene between clay mineral layers but increased the overall migration to a fatty food simulant. This migration value was higher from the 50/50 VPP/RPP film than from VPP. Nonetheless, clays reduced the migration and even more when the clay had greater hydrophilicity because of lower interactions between the nanocomposite and the fatty simulant. Conversely, nanocomposites and VPP/RPP control films exhibited low migration values in the acid and non-acid food simulants. Regarding tensile parameters, elongation at break values of PP film significantly increased with RPP addition, but the incorporation of organoclays reduced its ductility to values closer to the VPP.

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