Microstructure and Basic Properties of Domestic Butyl Rubber 1751

2014 ◽  
Vol 912-914 ◽  
pp. 235-242
Author(s):  
Nai Xiu Ding ◽  
Pei Yan Zuo ◽  
Yi Jia ◽  
Li Li Wang ◽  
Hai Tao Wang
Keyword(s):  
Molecular Mass ◽  
Gel Permeation Chromatography ◽  
Mechanical Analysis ◽  
Volatile Matter ◽  
Matter Content ◽  
Butyl Rubber ◽  
Gravimetric Analysis ◽  
Average Molecular Mass ◽  
Basic Properties

The characterization of microstructure and basic properties of domestic butyl rubber 1751 ( IIR 1751) was performed with different testing , such as 1H-NMR spectrum, gel permeation chromatography, dynamic mechanical analysis, thermal gravimetric analysis and differential scanning calorimeter. And the comparison with Butyl 268 and Butyl 301 was made. The results showed that IIR1751 had a narrower molecular mass distribution, lower number-average molecular mass and lower weight-average molecular mass. The unsaturation degree of IIR1751 was close to Butyl 268 and Butyl 301. Its thermal stability was higher than the other and its ash content and volatile matter content was lower. Its glass transition temperature was same to Butyl 268’s, which was slightly higher than the Butyl 301. Dispersion of carbon black in IIR1751 vulcanizates was poor, but IIR1751 vulcanizates had good processing property, had a longer scorch safety period and fast curing rate. Its fatigue performance was good and its mechanical properties can achieve a better balance.

Synthesis and Characterization of Poly Phenoxyl Bisphenol-S Phosphate

2012 ◽  
Vol 535-537 ◽  
pp. 1091-1094
Author(s):  
Da Ming Ban ◽  
Yang Min ◽  
Yong Hang Zhang ◽  
Ou Zhao
Keyword(s):  
Molecular Weight ◽  
Solid Phase ◽  
Phosphorus Oxychloride ◽  
Orthogonal Design ◽  
Influence Factors ◽  
Gel Permeation Chromatography ◽  
Decomposition Temperature ◽  
Gravimetric Analysis ◽  
Bisphenol S

A solid phase bisphenol-S bis(diphenyl phosphate)(BSDP), Poly Phenoxyl Bisphenol-S Phosphate（S-BSDP）was synthesized from phosphorus oxychloride, phenol and bisphenol-A in two step sythesis route. The influence factors on the yield and molecular weight of S-BSDP were investigated by the means of orthogonal design. The structure of S-BSDP was characterized with Fourier Transform Infrared Spectroscopy (FTIR). The molecular weight was determined by Gel Permeation Chromatography (GPC). Thermal stability of S-BSDP was studied by Thermal Gravimetric Analysis (TGA). The results review that S-BSDP was synthesized successfully and its structure is similar to BSDP. Its thermal decomposition temperature is much higher than liquid phase BSDP.

scholarly journals Purification, Characterization and Degradation Performance of a Novel Dextranase from Penicillium cyclopium CICC-4022

2019 ◽  
Vol 20 (6) ◽  
pp. 1360 ◽  
Author(s):  
Ruijie Huang ◽  
Lei Zhong ◽  
Fengwei Xie ◽  
Liming Wei ◽  
Lanfang Gan ◽  
...  
Keyword(s):  
Molecular Mass ◽  
Metal Ion ◽  
Specific Activity ◽  
Gel Filtration ◽  
Gel Permeation Chromatography ◽  
Fractional Precipitation ◽  
Penicillium Species ◽  
Average Molecular Mass ◽  
Penicillium Cyclopium ◽  
Effects Of Temperature

A novel dextranase was purified from Penicillium cyclopium CICC-4022 by ammonium sulfate fractional precipitation and gel filtration chromatography. The effects of temperature, pH and some metal ions and chemicals on dextranase activity were investigated. Subsequently, the dextranase was used to produce dextran with specific molecular mass. Weight-average molecular mass (Mw) and the ratio of weight-average molecular mass/number-average molecular mass, or polydispersity index (Mw/Mn), of dextran were measured by multiple-angle laser light scattering (MALS) combined with gel permeation chromatography (GPC). The dextranase was purified to 16.09-fold concentration; the recovery rate was 29.17%; and the specific activity reached 350.29 U/mg. Mw of the dextranase was 66 kDa, which is similar to dextranase obtained from other Penicillium species reported previously. The highest activity was observed at 55 °C and a pH of 5.0. This dextranase was identified as an endodextranase, which specifically degraded the α-1,6 glucosidic bonds of dextran. According to metal ion dependency tests, Li+, Na+ and Fe2+ were observed to effectively improve the enzymatic activity. In particular, Li+ could improve the activity to 116.28%. Furthermore, the dextranase was efficient at degrading dextran and the degradation rate can be well controlled by the dextranase activity, substrate concentration and reaction time. Thus, our results demonstrate the high potential of this dextranase from Penicillium cyclopium CICC-4022 as an efficient enzyme to produce specific clinical dextrans.

Purification and Preliminary Characterization of a Thermostable Lactase from Bacillus coagulans T242

2013 ◽  
Vol 690-693 ◽  
pp. 1362-1365
Author(s):  
Shu Juan Jiang ◽  
Guang Qing Mu ◽  
Tao Liu ◽  
Fang Qian
Keyword(s):  
Optimum Condition ◽  
Molecular Mass ◽  
Bacillus Coagulans ◽  
Gel Permeation Chromatography ◽  
Lactase Activity ◽  
High Concentration ◽  
Preliminary Characterization ◽  
Sds Page ◽  
Gel Permeation

A thermostable lactase from Bacillus coagulans T242 was subjected to purification on DEAE chromatography followed by gel permeation chromatography, then the homogenous Bacillus coagulans T242-lactase was obtained, and its molecular mass was 55.0 kDa as shown in SDS-PAGE. Analysis indicated its optimum condition was 60 C and pH 6.8 and it was stable at 40~60 C and pH6.5~7.8; Mn2+, Mg2+ and Na+ at high concentration all had marked activation on lactase activity. Kinetic constants determination revealed Bacillus coagulans T242-lactase had a strong affinity for lactose.

scholarly journals Characterization of Briquette from Crab Shell (Portunus pelagicus) with The Addition of Pati Adhesive

Marinade ◽  
2019 ◽  
Vol 2 (01) ◽  
pp. 59-65
Author(s):  
Annisa ◽  
R. Marwita Sari Putri ◽  
Aidil Fadli Ilhamdy
Keyword(s):  
Alternative Energy ◽  
Volatile Matter ◽  
Matter Content ◽  
Ash Content ◽  
Crab Shell ◽  
Adhesive Material ◽  
Portunus Pelagicus ◽  
Alternative Energy Source ◽  
Density Values

Briquettes is a solid fuel that can be used as an alternative energy source which has a certain shape. This study aims to determine the effect starch adhesive material on the characteristics of briquettes from crab shells waste. the percentage used between the crab shells and the adhesive were 85%: 15%, 80%: 20%, 75%: 25% and 70%: 30%, with the size of the powder sieve 40 mesh. Mixed crab shells powder and starch produces water content of 4.34-5.25%, where the value is in conformity with the desired moisture content SNI. The addition of adhesive on crab shell briquettes generates density values ranged from 0.33-0.52 g/cm3. The content of the ash content in the shells of crabs briquettes are 45 to 68.5% and volatile matter content is generated is equal to 51.70-52.41%.

scholarly journals Thermal decomposition of torrefied and carbonized briquettes of residues from coffee grain processing

2013 ◽  
Vol 37 (3) ◽  
pp. 221-228 ◽  
Author(s):  
Thiago de Paula Protásio ◽  
Isabel Cristina Nogueira Alves de Melo ◽  
Mario Guimarães Junior ◽  
Rafael Farinassi Mendes ◽  
Paulo Fernando Trugilho
Keyword(s):  
Thermal Decomposition ◽  
Fossil Fuels ◽  
Volatile Matter ◽  
Nitrogen Atmosphere ◽  
Matter Content ◽  
Gravimetric Analysis ◽  
Heating Rates ◽  
Fixed Carbon ◽  
Grain Processing ◽  
Eucalyptus Sawdust

The use of biomass has been recognized as a potential renewable energy and an alternative substitute that contributes to the decrease of fossil fuels consumption. Therefore, this research aimed to analyze the thermal behavior of briquettes made of residues from coffee grain processing in different conditions: in natura, torrefied and carbonized. Eucalyptus sawdust was used for comparison. The briquettes were carbonized considering final temperature of 450° C (kept for 30 min). The briquettes torrefaction was performed in an electric oven (muffle) using two heating rates until 250° C (kept 60 min). The thermal-gravimetric analysis was made in nitrogen atmosphere until the temperature of 600° C. The contents of fixed carbon and volatile matter of the fuels were determined. The carbonized briquette of residues from coffee grain processing presented higher stability and low thermal decomposition. It was observed a low influence of torrefaction heating rate under thermal properties of briquettes, and fixed carbon and volatile matter content. Regarding the raw biomass, lower total mass loss was observed for the residues from coffee grain processing when compared to Eucalyptus sawdust. The carbonized and torrefied briquettes presented higher hydrophobicity than raw briquettes.

Preparation and Characterization of Poly(Dimethyl Diallyl Ammonium Chloride)/Modified SiO2 Spherical Brushes

2015 ◽  
Vol 731 ◽  
pp. 569-572 ◽  
Author(s):  
Na Su ◽  
Zheng Min Cao
Keyword(s):  
Electron Microscopy ◽  
Ammonium Chloride ◽  
Thermo Gravimetric Analysis ◽  
Gel Permeation Chromatography ◽  
Gravimetric Analysis ◽  
Polyelectrolyte Brushes ◽  
Transmission Electron ◽  
Spherical Polyelectrolyte Brushes ◽  
Trimethoxy Silane

Novel cationic spherical polyelectrolyte brushes (CSPB) consisting of γ-methacryloxypropyl trimethoxy-silane (KH-570) modified SiO2cores and poly (Dimethyl diallyl ammonium chloride) (PDMDAAC) brushes were prepared by conventional free radical polymerization. The resulting CSPB were characterized by Fourier transform infrared spectroscopy (FTIR), Transmission electron microscopy (TEM), Scanning electron microscopy (SEM), and Thermo-gravimetric analysis (TGA). After cleaving the polyelectrolyte chains from the anchoring surface, the molecular weight of brushes was 1.824×103gmol-1from Gel Permeation Chromatography (GPC) measurements.

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