scholarly journals Fast Swelling Superabsorbent Hydrogels Starch Based Prepared by Gamma Radiation Techniques

2014 ◽  
Vol 14 (3) ◽  
pp. 246-252 ◽  
Author(s):  
Erizal Erizal ◽  
Dian Pribadi Perkasa ◽  
Basril Abbas ◽  
Sudirman Sudirman ◽  
Sulistioso G.S.
Keyword(s):  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Ionic Strength ◽  
Acrylic Acid ◽  
Irradiation Dose ◽  
Room Temperature ◽  
Scanning Calorimetry ◽  
Radiation Crosslinking ◽  
Infra Red ◽  
Short Time

Fast swelling hydrogels were synthesized from the mixture of acrylamide (AAM)-acrylic acid (AA)-starch (15:5:1 w/v) solution by radiation crosslinking with varying irradiation doses (7.5-12.5 kGy) at room temperature. The copolymers were characterizated by Fourier transform infra red spectroscopy (FTIR) and Differential scanning calorimetry (DSC). It was found that hydrogels showed superabsorbent properties with higher swelling capacities (~400 g/g) and reached at a very short time (3 min). There was no significance difference between the effect irradiation dose on swelling of hydrogels. The hydrogels were also found to sensitive to the ionic strength of medium. The FTIR spectra and thermogram DSC of hydrogels were confirmed the crosslinking occurs in the hydrogels.

The structural modification of epoxy resins by a liquid elastomer

1994 ◽  
Vol 6 (1) ◽  
pp. 71-81
Author(s):  
A Padma ◽  
R M V G K Rao ◽  
C Subramaniam
Keyword(s):  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Reaction Mechanism ◽  
Acrylic Acid ◽  
Epoxy Resins ◽  
Structural Modification ◽  
Scanning Calorimetry ◽  
Different Temperatures ◽  
Group Reaction ◽  
Diaminodiphenyl Methane

A carboxy terminated poly-n-(butyl acrylate, acrylic acid, acrylonitryl) (PNBA) terpolymer was used as a modifier for three high-functionality epoxy resins, (i) epoxy novolac, (ii) triglycidyl-4-aminophenol (TGPAP) and (iii) tetraglycidyl diaminodiphenyl methane (TGDDM), used as matrix materials in polymer composites. The resin and elastomer were reacted using different amine catalysts at different temperatures. The progress of the reaction between the epoxy resin and elastomer was studied extensively by Fourier transform infrared (FMR) spectroscopy and differential scanning calorimetry (psc). The results show that hydroxy esterification and etherification occurred during the epoxy-carboxy group reaction. The possible reaction mechanism involved is discussed on the basis of the results obtained.

One-Step Synthesis of a Liquid Crystal TB4A at Room Temperature

2011 ◽  
Vol 181-182 ◽  
pp. 168-172
Author(s):  
Qing Lan Ma ◽  
Bao Gai Zhai ◽  
Yuan Ming Huang
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Liquid Crystal ◽  
Room Temperature ◽  
Scanning Calorimetry ◽  
Smectic A ◽  
Smectic C ◽  
Infrared Spectrometer ◽  
One Step

A rod-like liquid crystal (LC) N,N-(terephthalylidene) bis (4-n-butylaniline) (TB4A) was synthesized by one step at room temperature. The synthesized TB4A were investigated with nuclear magnetic resonance, fourier transform infrared spectrometer and ultraviolet-visible spectrophotometry, differential scanning calorimetry and polarizing optical microscopy. Our results demonstrated that the TB4A can form nematic, smectic A, smectic C, smectic F and smectic G LC phases.

scholarly journals Morphological and Thermal Properties of Polystyrene Composite Reinforced with Biochar from Plantain Stalk Fibre

2020 ◽  
Vol 2 (2) ◽  
pp. 150-156 ◽  
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Thermal Properties ◽  
Functional Properties ◽  
Waste Disposal ◽  
Natural Fibres ◽  
Scanning Calorimetry ◽  
Plastic Composites ◽  
Infra Red

The advantages of natural fibres of synthetic fibres in the reinforcement of plastic composites have increased its use in diverse applications such as in the use of plant biochar in composite reinforcement. This research developed polystyrene composite development using biochar from plantain stalk fibre as filler. The composites obtained were analysed for their thermal and functional properties using Differential Scanning Calorimetry (DSC) and Fourier Transform Infra-Red Spectroscopy (FTIR) respectively. The composite with 30% filler was seen to have optimum thermal stability. The eco-friendliness of the composite gives a better solution to agro-waste disposal rather than burning.

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