scholarly journals Preparation and Performance of Different Modified Ramie Fabrics Reinforced Anionic Polyamide-6 Composites

Processes ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 226 ◽  
Author(s):  
Ze Kan ◽  
Hao Shi ◽  
Erying Zhao ◽  
Hui Wang
Keyword(s):  
Mechanical Properties ◽  
Coupling Agent ◽  
Flexural Modulus ◽  
Interaction Mechanism ◽  
Polyamide 6 ◽  
Dynamic Mechanical Properties ◽  
Interlaminar Shear ◽  
And Performance ◽  
High Level ◽  
Alkali Modification

Anionic polyamide-6 (APA-6) composites are prepared by the VARIM process using different modified ramie fabrics to study the structure and properties of different composites. This study can not only evaluate the optimal modification method for the ramie fabrics, but also further explore the interface interaction mechanism between ramie fabrics and APA-6. In this article, the ramie fabrics are modified by a pretreatment, coupling agent and alkali modification. Different modification methods have different effects on the structure, surface properties and mechanical properties of ramie fabrics, which will further affect the impregnation process, interfacial and mechanical properties of the composites. Through the performance analysis of different modified ramie fabrics reinforced APA-6 composites, the conversion, crystallinity and molecular weight of these composites are at a high level, which indicate that the polymerization of these composites is well controlled. The coupling agent modified ramie fabrics composites and the pretreated ramie fabrics composites have higher flexural modulus, tensile strength and dynamic mechanical properties. Alkali-modified ramie fabrics composites have slightly lower mechanical properties, which however have the highest interlaminar shear strength and outperformed interface properties of the composites.

Dynamic Mechanical Properties of Grafted Polypropylene Composites Reinforced with Acetylated Wheat Straw Fibers

2015 ◽  
Vol 1767 ◽  
pp. 139-143
Author(s):  
Ramón Sánchez ◽  
Jacobo Aguilar ◽  
Silvia Y. Martínez ◽  
Reyes J. Sanjuan ◽  
Gerardo A. Mejía ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wheat Straw ◽  
Coupling Agent ◽  
Optical Microscope ◽  
Dynamic Mechanical Properties ◽  
Particle Sizes ◽  
Polypropylene Composites ◽  
Dynamic Mechanical ◽  
Twin Screw ◽  
Composite Pellets

ABSTRACTDynamic mechanical properties of polypropylene (PP) and grafted polypropylene (PP-g-MA) composites reinforced with acetylated wheat straw fibers (WSF) is reported in this work. The materials were prepared with different fiber particle sizes (40, 80 and 140 U.S. mesh) and at different fiber contents (5, 10 and 15 wt.%). The PP and PP-g-MA composites, where anhydride maleic (MA) was used as coupling agent, were obtained using a twin-screw extruder; whereas an injection-molding machine molded the composite pellets into testing specimens. To observe the morphology of the composites, micrographs were taken with an optical microscope. The Dynamic mechanical properties were analyzed using a torsional rheometer. The morphological analysis showed a high porous structure somehow similar to foamed materials. The storage modulus (G′) increased by increasing the fiber content, and decreased with fiber particle sizes for the PP composites. Meanwhile, the use of the coupling agent additive promoted a modulus increase due to higher fiber-polymer interaction, from better adhesion and chemical bonds formation between the fibers-coupling agent-PP.

Characteristics Analysis of Coir Fiber and Performance Evaluation of Coir Fiberboard

2010 ◽  
Vol 146-147 ◽  
pp. 1549-1552
Author(s):  
Jia Yao ◽  
Ying Cheng Hu ◽  
Wei Lu ◽  
Jin Li
Keyword(s):  
Mechanical Properties ◽  
Nondestructive Testing ◽  
Orthogonal Experiment ◽  
Surface Characteristics ◽  
Dynamic Mechanical Properties ◽  
National Standards ◽  
Coir Fiber ◽  
Static Test ◽  
Characteristics Analysis ◽  
And Performance

SEM observations of coir fiber microstructure have been carried out. Uneven surface characteristics are conducive to the bonding between coir fibers and resin materials. The unique advantages of coir fiber have been verified. Doing orthogonal experiment design for coir fiberboard, the coir fiberboard can meet the mechanical properties of National Standards of China. The various factors optimization plan on the performance of coir fiberboard has been obtained. FFT nondestructive testing has been done for the coir fiberboard. Nondestructive testing results show that the good correlation exists between dynamic mechanical properties and the static test results.

scholarly journals Thermoplastic Reaction Injection Pultrusion for Continuous Glass Fiber-Reinforced Polyamide-6 Composites

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 463 ◽  
Author(s):  
Ke Chen ◽  
Mingyin Jia ◽  
Hua Sun ◽  
Ping Xue
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
High Speed ◽  
Flexural Modulus ◽  
Polyamide 6 ◽  
Thermoplastic Composites ◽  
Fiber Reinforced ◽  
Pultrusion Process ◽  
Glass Fiber Reinforced ◽  
Pultruded Composites

In this paper, glass fiber-reinforced polyamide-6 (PA-6) composites with up to 70 wt% fiber contents were successfully manufactured using a pultrusion process, utilizing the anionic polymerization of caprolactam (a monomer of PA-6). A novel thermoplastic reaction injection pultrusion test line was developed with a specifically designed injection chamber to achieve complete impregnation of fiber bundles and high speed pultrusion. Process parameters like temperature of injection chamber, temperature of pultrusion die, and pultrusion speed were studied and optimized. The effects of die temperature on the crystallinity, melting point, and mechanical properties of the pultruded composites were also evaluated. The pultruded composites exhibited the highest flexural strength and flexural modulus, reaching 1061 MPa and 38,384 MPa, respectively. Then, effects of fiber contents on the density, heat distortion temperature, and mechanical properties of the composites were analyzed. The scanning electron microscope analysis showed the great interfacial adhesion between fibers and matrix at 180 °C, which greatly improved the mechanical properties of the composites. The thermoplastic reaction injection pultrusion in this paper provided an alternative for the preparation of thermoplastic composites with high fiber content.

Mechanical and dynamic mechanical properties of polystyrene composites reinforced with cellulose fibers

2015 ◽  
Vol 30 (9) ◽  
pp. 1242-1254 ◽  
Author(s):  
Matheus Poletto ◽  
Ademir J Zattera
Keyword(s):  
Mechanical Properties ◽  
Coupling Agent ◽  
Interfacial Adhesion ◽  
Cellulose Fiber ◽  
Cellulose Fibers ◽  
Dynamic Mechanical Properties ◽  
Filler Loading ◽  
Fixed Amount ◽  
Dynamic Mechanical ◽  
Damping Peak

The mechanical and dynamic mechanical properties of cellulose fibers-reinforced polystyrene composites were investigated as a function of cellulose fiber content and coupling agent effect. The composites were prepared using a corotating twin-screw extruder and after injection molding. Three levels of filler loading (10, 20, and 30 wt%) and a fixed amount of coupling agent (2 wt%) were used. The results showed that a cellulose fiber loading of more than 20 wt% caused decrease in the mechanical properties. The addition of coupling agent substantially improves the mechanical and dynamic mechanical properties. The use of coupling agent improved the storage modulus and reduced the damping peak values of the composites due to the improved interfacial adhesion. The height of the damping peak was found to be dependent on the content of cellulose fiber and the interfacial adhesion between fiber and matrix. The adhesion factor values confirm that the better adhesion occurs when coupling agent is used.

scholarly journals Use of Organic Acids in Bamboo Fiber-Reinforced Polypropylene Composites: Mechanical Properties and Interfacial Morphology

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2007
Author(s):  
Lety del Pilar Fajardo Cabrera de Lima ◽  
Cristian David Chamorro Rodríguez ◽  
José Herminsul Mina Hernandez
Keyword(s):  
Mechanical Properties ◽  
Maleic Anhydride ◽  
Organic Acids ◽  
Coupling Agent ◽  
Flexural Modulus ◽  
Tricarboxylic Acid ◽  
Bamboo Fiber ◽  
Interfacial Bonding ◽  
Dodecanoic Acid ◽  
Interfacial Morphology

In obtaining wood polymer composites (WPCs), a weak interfacial bonding can cause problems during the processing and affect the mechanical properties of the resulting composites. A coupling agent (CA) is commonly used to solving this limitation. To improve the interfacial bonding between bamboo fiber (BF) and a polypropylene matrix, the effect of three organic acids on the mechanical properties and interfacial morphology were investigated. The BF/PP composites were prepared in five families: the first without CA, the second using a maleic anhydride-grafted polypropylene coupling agent, and the third, fourth, and fifth families with the addition of organic acids (OA) tricarboxylic acid (TRIA), hexadecanoic acid (HEXA), and dodecanoic acid (DODA), respectively. The use of OA in BF/PP improved the interfacial adhesion with the PP matrix, and it results in better mechanical performance than composites without CA. Composites coupled with MAPP, TRIA, DODA, and HEXA showed an increase in Young’s modulus of about 26%, 23%, 15%, and 16% respectively compared to the composite without CA incorporation. In tensile strength, the increase in composites with CA was about 190%, while in the flexural modulus, the coupled composites showed higher values, and the increase was more in composites with TRIA: about 46%. The improvement caused by tricarboxylic acid was similar to that promoted by the addition of maleic anhydride-grafted polypropylene (MAPP).

scholarly journals Mechanical Properties, Wettability and Thermal Degradation of HDPE/Birch Fiber Composite

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1459
Author(s):  
Agbelenko Koffi ◽  
Fayçal Mijiyawa ◽  
Demagna Koffi ◽  
Fouad Erchiqui ◽  
Lotfi Toubal
Keyword(s):  
Mechanical Properties ◽  
Differential Scanning Calorimetry ◽  
Thermal Degradation ◽  
Coupling Agent ◽  
High Density Polyethylene ◽  
Fiber Composite ◽  
Flexural Modulus ◽  
High Density ◽  
Wood Fibers ◽  
Scanning Calorimetry

Wood–plastic composites have emerged and represent an alternative to conventional composites reinforced with synthetic carbon fiber or glass fiber–polymer. A wide variety of wood fibers are used in WPCs including birch fiber. Birch is a common hardwood tree that grows in cool areas such as the province of Quebec, Canada. The effect of the filler proportion on the mechanical properties, wettability, and thermal degradation of high-density polyethylene/birch fiber composite was studied. High-density polyethylene, birch fiber and maleic anhydride polyethylene as coupling agent were mixed and pressed to obtain test specimens. Tensile and flexural tests, scanning electron microscopy, dynamic mechanical analysis, differential scanning calorimetry, thermogravimetry analysis and surface energy measurement were carried out. The tensile elastic modulus increased by 210% as the fiber content reached 50% by weight while the flexural modulus increased by 236%. The water droplet contact angle always exceeded 90°, meaning that the material remained hydrophobic. The thermal decomposition mass loss increased proportional with the percentage of fiber, which degraded at a lower temperature than the HDPE did. Both the storage modulus and the loss modulus increased with the proportion of fiber. Based on differential scanning calorimetry, neither the fiber proportion nor the coupling agent proportion affected the material melting temperature.

Effect of a Coupling Agent on Mechanical and Biological Properties of Polyetheretherketone/Hydroxyapatite Bioactive Composite for Prosthetic Medical Device

2011 ◽  
Vol 471-472 ◽  
pp. 898-903 ◽  
Author(s):  
Ahmad Ramli Rashidi ◽  
Uzir Wahit Mat ◽  
R.A. Abdullah
Keyword(s):  
Mechanical Properties ◽  
Coupling Agent ◽  
Flexural Modulus ◽  
Biological Properties ◽  
Screw Extruder ◽  
Composite Surface ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Sbf Solution ◽  
Ceramic Hydroxyapatite

For many years, research was focused on developing a medical part of human body from polymer as to replace metal. In this study, the aim is to produce a Polyetheretherketone/Hydroxyapatite (PEEK/HA) composite which posses balance mechanical properties and good spreading of bioactive ceramic, hydroxyapatite. The composite consist of 10-30 wt% HA were compounded via nano-single screw extruder and sample for testing were produced by injection molding. Each formulation of HA was treated with (3-Aminopropyl)trimethoxysilanes coupling agent to compare with untreated HA. The result showed that the slight increasing value of Elastic modulus, flexural strength, tensile strength while decreasing flexural modulus for 10 and 20 wt% HA compared to untreated composite. The enhance of bioactivity has been proven with the incorporation of HA into PEEK. SEM-EDX image showed the bulk formation of apatite layers on the composite surface with 30 wt% HA after 3 days immersed in SBF solution. Finally, these composite be capable of being one of the biomedical part seing as the mechanical properties were found to be within the properties of human cortical and cancellous bone.

Development of PA6/HDPE Nanocomposite Blends

2012 ◽  
Vol 729 ◽  
pp. 216-221 ◽  
Author(s):  
Hajnalka Hargitai ◽  
Tamás Ibriksz ◽  
János Stifter ◽  
Endre Andersen
Keyword(s):  
Mechanical Properties ◽  
Maleic Anhydride ◽  
Layered Structure ◽  
Coupling Agent ◽  
High Density Polyethylene ◽  
Polyamide 6 ◽  
High Density ◽  
Polyethylene Blends ◽  
Chemical Coupling ◽  
Melting Properties

In our experiments polyamide 6/high density polyethylene blends (25/75 wt%) were produced and maleic anhydride grafted polyethylene was used as chemical coupling agent. To get finer microstructure and enhance the mechanical properties the blends were compounded by different nanostructured reinforcements. Two kinds of nanosilicate, the layered structure montmorillonite and the needle like sepiolite were applied in different concentrations and their effect on the mechanical and melting properties were examined.

Sign in / Sign up

Export Citation Format

Share Document