Surface Modification of Flax Yarns by Enzymatic Treatment and Their Interfacial Adhesion with Thermoset Matrices

The aim of this study was to assess the effects of commercially available and relatively inexpensive enzyme preparations based on endo 1,4-β-xylanase, pectinase and xyloglucanase on the thermal (TGA), morphological (SEM), chemical (FT-IR) and mechanical (single yarn tensile tests) properties of flax yarns. The preparation based on pectinase and xyloglucanase provided the best results, resulting in the effective removal of hydrophilic components such as hemicellulose and pectin, the individualization of yarns and increased thermal stability at the expense of a reduction in mechanical properties, depending on the treatment parameters. Single yarn fragmentation tests pointed out an improved interfacial adhesion after enzymatic treatment, with reduced debonding length values of 18% for an epoxy matrix and up to 36% for a vinylester resin compared to untreated flax yarns.

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Polymeric Composites Based on Polyurea Matrix Reinforced with Carbon Nanotubes

Materiale Plastice ◽

10.37358/mp.17.1.4781 ◽

2017 ◽

Vol 54 (1) ◽

pp. 41-44 ◽

Cited By ~ 1

Author(s):

Maria Adina Vulcan ◽

Celina Damian ◽

Paul Octavian Stanescu ◽

Eugeniu Vasile ◽

Razvan Petre ◽

...

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Carbon Nanotubes ◽

Thermal Stability ◽

Scanning Electron Microscopy ◽

Tensile Tests ◽

Mechanical Analysis ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

Scanning Electron

This paper deals with the synthesis of polyurea and its use as polymer matrix for nanocomposites reinforced with multi-walled carbon nanotubes (MWCNT). Two types of materials were obtained during this research, the first cathegory uses the polyurea as matrix and the second one uses a mixture between epoxy resin and polyurea. The nanocomposites were characterized by Thermogravimetric Analysis (TGA), Dynamic Mechanical Analysis (DMA), Scanning Electron Microscopy (SEM) and Tensile Tests .The elastomeric features of nanocomposites were highlighted by the results which showed low value of Tg. Also higher thermal stability with ~40oC compared with commercial products (M20) were observed, but lower mechanical properties compared to neat polyurea.

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Preparation and Properties of Silane-Terminated Poly(urethane-Imide)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.690-693.1577 ◽

2013 ◽

Vol 690-693 ◽

pp. 1577-1580

Author(s):

Xiao Xi Hu ◽

Yun Wang

Keyword(s):

Thermal Stability ◽

Water Resistance ◽

Tensile Tests ◽

Mechanical Analysis ◽

Gravimetric Analysis ◽

Thermal Gravimetric ◽

Silane Coupling ◽

Ft Ir ◽

And Storage ◽

Thermal Stability Of

A serious of silane-terminated poly (urethane-imide) (Si-PUI) was synthesized via prepolymer method using polycarbonatediols (PCDL), 2,4-tolylene diisocyanate (TDI), 4,4'-Oxydiphthalic Anhydride (ODPA) and silane coupling agent KH-550. The structure of the products was characterized by FT-IR. The thermal properties were measured by thermal gravimetric analysis (TGA). The thermal mechanical behavior was investigated by dynamic mechanical analysis (DMA).The mechanical characteristic was measured by tensile tests. The water absorption (Wa) was also been tested. With the imide content increasing, the thermal stability, tensile strength and storage modulus of poly (urethane-imide) improve significantly, and the glass transition temperature rises. The introduction of silanes improves the water resistance and further enhances the thermal stability of poly (urethane-imide).

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Improvement of thermal stability and mechanical properties of medical polyester composites by plasma surface modification of the bioactive glass particles

Polymer Degradation and Stability ◽

10.1016/j.polymdegradstab.2013.06.003 ◽

2013 ◽

Vol 98 (9) ◽

pp. 1717-1723 ◽

Cited By ~ 14

Author(s):

A. Larrañaga ◽

S. Petisco ◽

J.R. Sarasua

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Surface Modification ◽

Bioactive Glass ◽

Plasma Surface Modification ◽

Plasma Surface ◽

Polyester Composites

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Effect of surface modification on mechanical properties and thermal stability of Sm–Co high temperature magnetic materials

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2006.07.233 ◽

2006 ◽

Vol 201 (6) ◽

pp. 3430-3437 ◽

Cited By ~ 19

Author(s):

C.H. Chen ◽

M.Q. Huang ◽

John E. Foster ◽

G. Monnette ◽

J. Middleton ◽

...

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Surface Modification ◽

High Temperature ◽

Magnetic Materials ◽

Thermal Stability Of ◽

Effect Of Surface

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The Characterization of a New Antibacterial Polyurethane

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.750-752.1609 ◽

2013 ◽

Vol 750-752 ◽

pp. 1609-1612 ◽

Cited By ~ 2

Author(s):

Yang Ti ◽

Jian Ru Wu ◽

Da Jun Chen

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Antibacterial Activity ◽

Thermogravimetric Analysis ◽

Shake Flask ◽

Antibacterial Property ◽

Tensile Tests ◽

Thermal Stability Of

In this paper, Fe-OCAP/PU blends were prepared. The mechanical properties and thermal stability of the samples were studied by tensile tests and thermogravimetric analysis, respectively. Results showed that the mechanical properties and thermal stability of the samples were improved with the increase of Fe-OCAP content. The antibacterial property of Fe-OCAP and Fe-OCAP/PU films was investigated by agar diifusion method and shake flask method, respectively. Fe-OCAP and Fe-OCAP/PU films showed efficient antibacterial activity againstS.aureus.

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Synthesis and Properties of Polyurethane - Dispersed Diazo Black GNN Polymer Dye

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.852.1 ◽

2020 ◽

Vol 852 ◽

pp. 1-10

Author(s):

Zhong Li Wang ◽

Cong Liang Cheng ◽

Xian Hai Hu ◽

John Garcia

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Thermogravimetric Analysis ◽

Amorphous Structure ◽

Elongation At Break ◽

Good Thermal Stability ◽

Ft Ir

Polyurethane - Dispersed Diazo Black GNN Polymer dye (PU-DDB GNN) was synthesized by incorporation of DDB GNN into polyurethane chains. The expected structure of polyurethane-dispersed diazo black GNN polymer dye was confirmed by FT-IR and UV-vis spectra. The photochromic phenomenon of polyurethane-dispersed diazo-black GNN dyes was investigated. And through the thermogravimetric analysis and differential calorimetry analysis, it is confirmed to be an amorphous structure with good thermal stability. Through the test of its mechanical properties, the results show that the elongation at break is quite high.

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Using Rutile TiO2Nanoparticles Reinforcing High Density Polyethylene Resin

International Journal of Polymer Science ◽

10.1155/2014/758351 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7 ◽

Cited By ~ 2

Author(s):

Vu Manh Tuan ◽

Da Woon Jeong ◽

Ho Joon Yoon ◽

SangYong Kang ◽

Nguyen Vu Giang ◽

...

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Tensile Strength ◽

High Density Polyethylene ◽

High Density ◽

Melt Blending ◽

Ft Ir ◽

Blending Process ◽

Fesem Micrographs ◽

Ft Ir Spectroscopy

The TiO2nanoparticles were used as a reinforcement to prepare nanocomposites with high density polyethylene (HDPE) by melt blending process. The original TiO2(ORT) was modified by 3-glycidoxypropyltrimethoxysilane (GPMS) to improve the dispersion into HDPE matrix. The FT-IR spectroscopy and FESEM micrographs of modified TiO2(GRT) demonstrated that GPMS successfully grafted with TiO2nanoparticles. The tensile test of HDPE/ORT and HDPE/GRT nanocomposites with various contents of dispersive particles indicated that the tensile strength and Young’s modulus of HDPE/GRT nanocomposites are superior to the values of original HDPE and HDPE/ORT nanocomposites. At 1 wt.% of GRT, the mechanical properties of nanocomposites were optimal. In DSC and TGA analyses, with the presence of GRT in the nanocomposites, the thermal stability significantly increased in comparison with pure HDPE and HDPE/ORT nanocomposites. The better dispersion of GRT in polymer matrix as shown in FESEM images demonstrated the higher mechanical properties of HDPE/GRT nanocomposites to HDPE/ORT nanocomposites.

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Flame Retardancy, Thermal Stability, and Mechanical Properties of Sisal Fiber/Organoclay/Polypropylene Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.410.47 ◽

2011 ◽

Vol 410 ◽

pp. 47-50 ◽

Cited By ~ 1

Author(s):

Wichuda Chanprapanon ◽

Nitinat Suppakarn ◽

Kasama Jarukumjorn

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Maleic Anhydride ◽

Flame Retardancy ◽

Interfacial Adhesion ◽

Sisal Fiber ◽

Melt Blending ◽

Polypropylene Composites ◽

Pp Composites ◽

Thermal Stability Of

Composites based on polypropylene (PP) and sisal fiber (SF) were prepared by melt blending. Sisal fiber content was 30 phr. Organoclay (OMMT; Cloisite®30B) (1-7 phr) was incorporated into the composites. In addition, maleic anhydride grafted polypropylene (MAPP) was used as a compatibilizer to enhance the interfacial adhesion between PP matrix and sisal fiber and also to improve the dispersion of the organoclay in PP matrix. The addition of OMMT had insignificantly affected mechanical properties of SF/PP composites. However, flame retardancy and thermal stability of SF/PP composites were improved dramatically with the presence of OMMT.

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The Research of Poly Propylene Carbonate /Nano-SiO2 Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.904.74 ◽

2014 ◽

Vol 904 ◽

pp. 74-77 ◽

Cited By ~ 1

Author(s):

Qu Li ◽

Heng Wu ◽

Si Yuan Xie ◽

Jiao Sun ◽

Xing Hai Liu ◽

...

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Tensile Strength ◽

Glass Transition ◽

Transition Temperature ◽

Propylene Carbonate ◽

Tensile Tests ◽

Slight Improvement ◽

Biodegradable Poly ◽

Poly Propylene

Biodegradable poly (propylene carbonate) (PPC) composite with a slight improvement in the thermal stability and tensile strength was successfully prepared by incorporating a low content of nano-SiO2. Tensile tests demonstrate the better mechanical properties of the composites prepared in this study. The obtained composites increases sharply from 1.57Mpa to 12.04Mpa by incorporating 5wt% nano-SiO2. Furthermore, the composites show approximately 8°C higher glass transition temperature (Tg) than that of neat PPC.The Tdmax of composite with 5wt% of nano-SiO2 was about 40°C higher than that of neat PPC.

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Effect of Fiber Surface Modification with Different Functional Groups Silane Agents on Mechanical Properties of Hemps/Polypropylene Composites

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.470.23 ◽

2013 ◽

Vol 470 ◽

pp. 23-26 ◽

Cited By ~ 4

Author(s):

Hong Chang Han ◽

X. Lu Gong

Keyword(s):

Mechanical Properties ◽

Fracture Strain ◽

Fiber Surface ◽

Covalent Bond ◽

Tensile Tests ◽

Hemp Fiber ◽

Polypropylene Composites ◽

Propyl Methacrylate ◽

Ft Ir ◽

Sem Morphology

In this paper, we firstly treated the hemp fiber with alkali solution, followed by chemical modification with silane agents: 3-(Trimethoxysilyl) propyl methacrylate (MPS), N-[3-(Trimethoxysilyl) propyaniline (PAPS) and (3-Aminopropyl) triethoxysilane (APS), respectively. These treated fibers were then blended with polypropylene (PP). SEM morphology and FT-IR spectra confirmed the successful modifications of MPS, PAPS and APS with hemp fiber. The tensile tests results showed that APS improved the mechanical properties of composite, due to the amino of APS could react with maleic anhydride forming amide covalent bond which is benefit in the stress transferring from PP matrix to fiber. In contrast, since the incompatibility of aniline with propylene, PAPS modification decreased the fracture stress composites. The existences of ester and vinyl groups in MPS contributed to the increase of composite fracture strain caused by chain slips.

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