scholarly journals FTIR and Thermal Studies on Nylon-66 and 30% Glass Fibre Reinforced Nylon-66

2009 ◽  
Vol 6 (1) ◽  
pp. 23-33 ◽  
Author(s):  
Julie Charles ◽  
G. R. Ramkumaar ◽  
S. Azhagiri ◽  
S. Gunasekaran
Keyword(s):  
Activation Energy ◽  
Glass Fibre ◽  
Thermal Studies ◽  
Polymeric Materials ◽  
Thermally Stable ◽  
Melting Behaviour ◽  
Thermal Transitions ◽  
Nylon 66 ◽  
Degradation Temperature ◽  
Glass Fibre Reinforced

The present study deals with the characterization of the polymeric materialsviz.,nylon-66 and 30% glass fibre reinforced nylon-66 (GF Nylon-66) by employing FTIR and thermal measurements. The complete vibrational band assignment made available for nylon-66 and GF nylon-66 using FTIR spectra confirm their chemical structure. FTIR spectroscopy provides detailed information on polymer structure through the characteristic vibrational energies of the various groups present in the molecule. The thermal behavior of nylon-66 and GF nylon-66 essential for proper processing and fabrication was studied from TGA and DTA thermograms. The thermal stability of the polymers was studied from TGA and the activation energy for the degradation of the polymeric materials was calculated using Murray-White plot and Coats-Redfern plot. The polymer with high activation energy is more thermally stable. GF nylon-66 is found to be more thermally stable than nylon-66. The major thermal transitions such as crystalline melting temperature (Tm) and degradation temperature (Td) of the polymers were detected from DTA curves. The melting behaviour of the polymer depends upon the specimen history and in particular upon the temperature of crystallization. The melting behaviour also depends upon the rate at which the specimen is heated. The various factors such as molar mass and degree of chain branching govern the value of Tmin different polymers.

Investigation on the Dynamic Mechanical Properties of Self-Healing Glass Fibre Reinforced Plastics

2017 ◽  
Vol 9 (2) ◽  
Author(s):  
J. Lilly Mercy ◽  
S. Prakash
Keyword(s):  
Mechanical Properties ◽  
Glass Fibre ◽  
Polymeric Materials ◽  
Dynamic Mechanical Properties ◽  
Damping Factor ◽  
Self Healing ◽  
Dynamic Mechanical ◽  
Reinforced Plastics ◽  
Glass Fibre Reinforced ◽  
Glass Fibre Reinforced Plastics

Self-healing polymeric materials developed in the last decade is one of the marvels in the field of material science and polymer chemistry. Self-healing Glass Fibre Reinforced Plastics (GFRP) was fabricated with the microcapsule based self-healing system which can be triggered by the catalyst, when the capsule breaks open releasing the healing agent, during crack formation. The dynamic mechanical properties of the composite were assessed to find its dependence on temperature, stress and frequency and to report the changes in stiffness and damping. The storage modulus, loss modulus and damping factor were investigated for various frequencies and temperature and discussed.

scholarly journals Thermal studies on Arabic gum - carrageenan polysaccharides film

2017 ◽  
Vol 19 ◽  
pp. 80 ◽  
Author(s):  
J Jamaludin ◽  
F Adam ◽  
R Abdul Rasid ◽  
Z Hassan
Keyword(s):  
Activation Energy ◽  
Chemical Engineering ◽  
Thermal Studies ◽  
Control Sample ◽  
Activation Energies ◽  
Thermal Transitions ◽  
Scanning Calorimetry ◽  
Polyethylene Glycol 400 ◽  
Arabic Gum ◽  
Endothermic Transition

<p>The main objective of this work is to develop film and study the thermal characteristics of polysaccharides films at various concentration of carrageenan in the mixture by calculating activation energy of polysaccharides films. There were four (4) film samples of two polysaccharides combination; arabic gum (AG) and carrageenan (C) with different formulations; sample A, sample B, sample C and sample D prepared. Sample A film is the control sample that contained only arabic gum and distilled water (DI) with 40% weight arabic gum per volume DI water (w/v%). Meanwhile for sample B and C were prepared with concentration 40 w/v% of Arabic gum and two differents of carrageenan concentrations; 1 w/v% and 10 w/v% respectively. Polyethylene glycol 400 (PEG 400) as a plasticiser was added into sample D film. The sample films were thermally characterized using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) under nitrogen atmosphere. The major thermal transitions as well as, activation energies of the major decomposition stages were determined. Sample A and B films exhibited the highest (112.43 kJ/mol) and the lowest (102.89 kJ/mol) activation energy of thermal decomposition, respectively. The activation energies were lower at larger amounts of sulfate groups from carrageenan on the degradation reactions. The DSC trend for all samples shows two (2) major intense peaks recorded in the DSC thermograms; an endothermic transition at temperature around 100<sup>°</sup>C and followed by an exothermic transition at temperature around 300<sup>°</sup>C. The endothermic transition is due to the heat absorption for dehydration of water, H2O and the decomposition of samples process. Meanwhile, the exothermic transition is caused by the formation of H<sub>2</sub>O, CO and CH<sub>4</sub> in polysaccharide film from dehydration, depolymerisation and decomposition at the high-temperature stages.</p><p>Chemical Engineering Research Bulletin 19(2017) 80-86</p>

Lap shear strength comparison between different random glass fibre reinforced thermoplastic matrix composites bonded by adhesives using variable-frequency microwave irradiation

2003 ◽  
Vol 217 (1) ◽  
pp. 65-75
Author(s):  
H S Ku ◽  
E Siores ◽  
J A R Ball ◽  
A Taube ◽  
F Siu
Keyword(s):  
Microwave Irradiation ◽  
Glass Fibre ◽  
Power Level ◽  
Variable Frequency ◽  
Matrix Composites ◽  
Nylon 66 ◽  
Polyethylene Composite ◽  
Lap Shear ◽  
Thermoplastic Matrix ◽  
Glass Fibre Reinforced

This paper compares the lap shear strengths of three types of random glass fibre reinforced thermoplastic matrix composite joined by adhesives using microwave energy. Variable-frequency microwave (VFM) (2-18 GHz) facilities are used to join 33 wt % random glass fibre reinforced low-density polyethylene composite [LDPE/GF (33%)], 33 wt % random glass fibre reinforced polystyrene composite [PS/GF (33%)] and 33 wt % random glass fibre reinforced nylon 66 composite [nylon 66/GF (33%)]. With a given power level, the composites were exposed for various times to microwave irradiation. The primer or coupling agent used was a 5 min two-part adhesive.

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