UHMWPE/organoclay nanocomposites fabricated by melt intercalation under continuous elongational flow: Dispersion, thermal behaviors and mechanical properties

2018 ◽  
Vol 59 (3) ◽  
pp. 547-554 ◽  
Author(s):  
Wangyang Lin ◽  
Aolin Hou ◽  
Yan-Hong Feng ◽  
Zhi-Tao Yang ◽  
Jin-Ping Qu
Keyword(s):  
Mechanical Properties ◽  
Elongational Flow ◽  
Thermal Behaviors ◽  
Melt Intercalation

Effect of Elongational Flow and Polarity of Organomodified Clay on Morphology and Mechanical Properties of a PLA Based Nanobiocomposite

2016 ◽  
Vol 31 (5) ◽  
pp. 541-547 ◽  
Author(s):  
F. P. La Mantia ◽  
M. Ceraulo ◽  
M. C. Mistretta ◽  
F. Sutera ◽  
L. Ascione ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elongational Flow ◽  
Morphology And Mechanical Properties

Correlation between Physico-Mechanical Properties of NR-BR Blends in Tire Tread Formulation with their Thermal Behaviors

2008 ◽  
Vol 81 (2) ◽  
pp. 297-317 ◽  
Author(s):  
Saeed Taghvaei-Ganjali ◽  
Fereshteh Motiee ◽  
Farsa Fotoohi
Keyword(s):  
Mechanical Properties ◽  
Thermal Analysis ◽  
Peak Height ◽  
Peak Height Ratio ◽  
Butadiene Rubber ◽  
Height Ratio ◽  
Thermal Behaviors ◽  
Degradation Temperature ◽  
Rubber Compounds ◽  
Successful Technique

Abstract Thermal analysis provides a successful technique for the characterization and identification of rubber compounds. In this study, TGA (thermogravimetric analysis) and DTG (TGA derivative) profiles are used to predict and define the physico-mechanical properties of natural rubber — butadiene rubber (NR / BR) blends, using their thermal behaviors. DTG curves of vulcanizate showed that the initial degradation temperature of NR is lower than BR. According to TGA-DTG profiles we have demonstrated two useful factors, ΔTmax (Tmax BR100−Tmax BRX) and peak height ratio of NR-BR blends which are correlated with physico-mechanical properties of blends.

scholarly journals Compatibilization of Polypropylene/Polyamide 6 Blend Fibers Using Photo-Oxidized Polypropylene

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 81 ◽  
Author(s):  
Francesco La Mantia ◽  
Manuela Ceraulo ◽  
Maria Mistretta ◽  
Luigi Botta ◽  
Marco Morreale
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Morphological Changes ◽  
Elongational Flow ◽  
Polyamide 6 ◽  
Flow Conditions ◽  
Polyolefin Blends ◽  
Pp Blends ◽  
Oxidized Polypropylene

The use of polyamide/polyolefin blends has gained importance and concern for years, but they also show some issues to be adequately addressed, such as the incompatibility between the two components. This is usually overcome by using suitable compatibilizers, typically based on functionalized polyolefins. However, there is only little information about the use of a degraded polyolefins to induce compatibilization. This is even truer, as far as polyamide 6/polypropylene (PA6/PP) blends are concerned. In this work, compatibilization of PA6/PP blends by using small amounts of photo-oxidized PP was investigated; furthermore, the effects due to the presence of the photo-oxidized PP were studied also in relationship to the spinning operation, where the existence of the non-isothermal elongational flow can lead to significant, further morphological changes. It was found that isotropic samples showed significant enhancements of the tensile properties upon adding the photo-oxidized PP. Under non-isothermal elongational flow conditions, the presence of the photo-oxidized PP was particularly effective in improving the mechanical properties in comparison to the uncompatibilized blend fibers. Furthermore, an important result was found: The elongational-flow processing allowed obtaining anisotropic samples where the improvements of the properties, in comparison to the isotropic samples, were similar to those achieved by using a compatibilizer.

Thermal Behaviors and Mechanical Properties of Polylactic Acid-Bagasse Composite Film

2013 ◽  
Vol 7 (5) ◽  
pp. 639-647 ◽  
Author(s):  
Chamaiporn Yamoum ◽  
Rathanawan Magaraphan
Keyword(s):  
Mechanical Properties ◽  
Composite Film ◽  
Polylactic Acid ◽  
Thermal Behaviors

EFFECT OF STEREOCOMPLEX FORMATION IN D-LACTIDE-CONTAINING PLLA ON THERMAL BEHAVIORS AND MECHANICAL PROPERTY CHANGES USING THE AGEING DEGRADATION TEST

2013 ◽  
Vol 25 (05) ◽  
pp. 1340003
Author(s):  
Tsai-Chin Shih ◽  
Che-Tong Lin ◽  
Sheng-Yang Lee ◽  
Wei-Jen Chang ◽  
Nai-Chia Teng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Mechanical Performance ◽  
Test Method ◽  
Molar Ratio ◽  
Thermal Behaviors ◽  
Binding Strength ◽  
Stereocomplex Formation ◽  
Degradation Test ◽  
Hydrolytic Resistance

Introduction: The formation of a stereocomplex between PLLA and PDLA has been studied intensively because it increases the mechanical performance and thermal/hydrolytic resistance of polylactide-based materials; however, few studies have investigated the stereocomplex formation between PLLA and the (D-lactide)-containing PLLA copolymer. To investigate the effect of the D-lactide content of PLLA on the thermal behaviors and mechanical properties, (5D/95L) polylactide [(5D/95L)PLA], which contains a molar ratio of 5% of the D-form and 95% of the L-form of the monomer, and (15D/85L) polylactide [(15D/85L)PLA], which contains a molar ratio of 15% of the D-form and 85% of the L-form of the monomer, were used in a series of specimens. For the hydrolytic degradation test, the specimens were placed in 20-mL vials, which were filled with phosphate-buffered solution; the vials were allowed to stand at 57°C for 91 days in accordance with the ASTM F1635-95 (2000) standard test method for in vitro studies. The mechanical properties, thermal properties and crystallization behaviors were investigated using DSC and MTS, respectively. Results: The initial bending strength of the (5D/95L)PLA and (15D/85L)PLA were 35.4 and 31.1 N, respectively. After 1 week, the binding strength of the (5D/95L)PLA increased by 9.8%, and the binding strength of the (15D/85L)PLA decreased by 26%. In addition, the DSC curve of the (5D/95L)PLA demonstrated a higher melting temperature in the 1st week, and this Tc was observed in the DSC curve of the (5D/95L)PLA only during this time. The DSC curve of the (15D/85L)PLA was irregular. Discussion & Conclusions: In the (5D/95L)PLA, the recrystallization that occurred during the hydrolysis process was confirmed by the Tc and the increase in the bending strength. The stereocomplex crystallites may be formed in the (15D/85L)PLA during the degradation process. Because of the increase in the D-form monomer, the stereocomplexes were generated more easily and acted as nucleation sites. The PLLA crystal near the stereocomplex crystallites exhibited an incomplete structure, which led to a faster decrease in the bending strength. The low D-lactide content in the matrix of the PLLA did not form a stereocomplex crystallite because the surface area was not large enough to act as a nucleation site. However, the higher D-lactide-containing fraction formed a large stereocomplex crystallite. The (5D/95L)PLA demonstrated better thermal/hydrolytic resistance and mechanical stability than the (15D/85L)PLA.

scholarly journals RESEARCH INTO FABRICATION PA6/CLAY-NANOCOMPOSITES IN ORDER TO MAKE WATER LUBRICATED STERN TUBE BEARINGS

2011 ◽  
Vol 14 (1) ◽  
pp. 39-45
Author(s):  
Nieu Huu Nguyen ◽  
Tien Tu Duong ◽  
Cuong Tien Nguyen ◽  
Duong Hoang Nguyen
Keyword(s):  
Mechanical Properties ◽  
Impact Energy ◽  
Water Saturation ◽  
Clay Nanocomposites ◽  
Melt Intercalation ◽  
Intercalation Process ◽  
Better Than

In this research, the preparations of PA6/Clay (4% namomer I.30TC) nanocomposites by melt-intercalation process were carried out. The mechanical properties, impact energy, heat deflection temperatures (HDT) and tribology properties of these nanocomposites in the case of being annealed and water saturation were determined and compared to PA6 and Capron. All of the properties of these nanocomposites were better than those of Russia’s Capron and PA6. These nanocomposites were used to make water lubricated stern tube bearings. The study shows promissing results.

Preparation and Properties of a Novel Thermosetting Resin Based on 4,4'-Bismaleimidodiphenyl Methane and Allyl COPNA Resin

2012 ◽  
Vol 430-432 ◽  
pp. 24-27
Author(s):  
Lei Xiong ◽  
Qi Lang Lin
Keyword(s):  
Mechanical Properties ◽  
Dielectric Properties ◽  
Physical Properties ◽  
Rheological Properties ◽  
Thermosetting Resin ◽  
Resin System ◽  
Thermal Behaviors ◽  
Chemical Structures ◽  
Copna Resin ◽  
Thermo Stability

A bismaleimide (BMI) resin system based on allyl condensed polynuclear aromatic resin and 4,4'-bismaleimidodiphenyl methane was prepared in this paper. The chemical structures and rheological properties of the resin prepolymer were characterized by FTIR and viscometer, respectively. DSC was used to study the curing reaction of the resin prepolymer, and TG-DTG was employed to study the thermal behaviors of the cured resin. Moreover, physical properties of the BMI resin, including mechanical and dielectric properties, were studied. The results showed that the BMI resin had good thermo-stability, good mechanical properties and excellent dielectric properties. Introduction

Biodegradable Poly(Lactic Acid)/Clay Nanocomposites by Melt Intercalation: A Study of Morphological, Thermal, and Mechanical Properties

2009 ◽  
Vol 14 (4) ◽  
pp. 336-350 ◽  
Author(s):  
Parakalan Krishnamachari ◽  
Jian Zhang ◽  
Jianzhong Lou ◽  
Jizhong Yan ◽  
Leonard Uitenham
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Clay Nanocomposites ◽  
Thermal And Mechanical Properties ◽  
Melt Intercalation ◽  
Biodegradable Poly
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