A Novel Method for Functionalization of Polypropylene with Oligomer of Glycidyl Methacrylate: Characterization of Copolymers

2006 ◽  
Vol 11-12 ◽  
pp. 733-736 ◽  
Author(s):  
Shu Jun Liang ◽  
Jian Ping Deng ◽  
Lian Ying Liu ◽  
Wan Tai Yang
Keyword(s):  
Free Radicals ◽  
Glycidyl Methacrylate ◽  
Crystal Form ◽  
Organic Peroxide ◽  
Decomposition Temperature ◽  
Initial Decomposition Temperature ◽  
Photo Polymerization ◽  
Novel Approach ◽  
Novel Method

A novel approach to functionalize polypropylene (PP) is presented. This method consists of two steps. Firstly, oligomers of glycidyl methacrylate (GMA) were synthesized via UV photo-polymerization using benzophenone (BP) as initiator. Secondly, the GMA oligomers were grafted onto PP, which was initiated by the free radicals generated through the reactivation of semipinacol dormant groups in the oligomers. By this method, the functionalization of PP could be facilely achieved in a simple system without either organic peroxide initiator or monomer; additionally, degradation of the substrate PP was not observed. This presentation is mainly focused on the characterization of the grafted PP products by XRD, DSC and TGA measurements. It is demonstrated that the melting temperature, crystallinity and the initial decomposition temperature of the grafted PP were all increased, compared with those of the origin PP; the functionalization of PP led to the change of the crystal form from the mixed form of α and β into only α form.

scholarly journals The Synthesis of Magnesium Soaps as Feed for Biohydrocarbon Production

2018 ◽  
Vol 156 ◽  
pp. 03001 ◽  
Author(s):  
Meiti Pratiwi ◽  
Godlief F. Neonufa ◽  
Tirto Prakoso ◽  
Tatang H. Soerawidjaja
Keyword(s):  
Coconut Oil ◽  
Decomposition Temperature ◽  
Direct Reaction ◽  
Initial Decomposition Temperature ◽  
Process Yield ◽  
Palm Stearine ◽  
Metal Soaps ◽  
Amorphous Surface ◽  
Great Potency

In previous study, by heating magnesium basic soaps from palm stearine will decarboxylated and produced biohydrocarbon. The frequent method to produced metal soaps from triglyceride in laboratory scale is metathesis. This process is less favored because this method would produced large amounts of salt waste and hard to develop into bigger scale. This study investigated the process and characterization of magnesium soaps from coconut oil and magnesium hydroxide via direct reaction method at 185 °C for 3 and 6 hours. The resulting soaps were washed with water and methanol, then dried. This process yield more than 80%-w metal soaps, acid values lower than 6 mg KOH/g and pH 9.2. Based on Thermogravimetry Analysis (TGA) and SEM results, the initial decomposition temperature of these metal soaps were at 300 °C and have amorphous surface morphology. From decarboxylation test of magnesium basic soaps indicate great potency as feed for biohydrocarbon production.

Halogenated methacrylate-based aluminum oxide (Al2O3) nanocomposites

2015 ◽  
Vol 30 (6) ◽  
pp. 762-772
Author(s):  
Kathikar Abdul Wasi ◽  
Sakvai Mohammed Safiullah ◽  
Kottur Anver Basha
Keyword(s):  
Aluminum Oxide ◽  
Polymer Matrix ◽  
Glycidyl Methacrylate ◽  
Morphological Changes ◽  
Thermal Studies ◽  
Gel Permeation Chromatography ◽  
Decomposition Temperature ◽  
Scanning Calorimetry ◽  
Initial Decomposition Temperature ◽  
Mixing Techniques

The aim of the work is to prepare the halogenated methacrylate-based polymer nano-aluminum oxide (Al2O3) composites and to study the effect of incorporated nano-Al2O3 on morphological and thermal studies. A functional 2,4,6-tribromophenyl methacrylate- co-glycidyl methacrylate copolymer microspheres (poly(TBPMA- co-GMA); pTG) by emulsion solvent evaporation techniques, whereas (2,4,6-tribromophenyl methacrylate- co-glycidyl methacrylate)-Al2O3 nanocomposites (pTG-Al2O3 nanocomposites) were prepared by solution mixing techniques. The pTG and its Al2O3 nanocomposites were structurally characterized by Fourier transform infrared (FTIR) spectroscopy. Thermal studies of pTG and its Al2O3 nanocomposites were carried out by thermogravimetric analysis and differential scanning calorimetry . The molecular weight of the pTG was determined by gel permeation chromatography. The size distribution and morphology of the pTG and its Al2O3 nanocomposites were determined by scanning electron microscopy (SEM). The FTIR results reveal that there is no significant interaction between the polymer matrix and Al2O3 nanoparticle. The significant increase in the initial decomposition temperature and glass transition temperature of pTG-Al2O3 nanocomposites compared to its polymer was due to the incorporation of nano-Al2O3 in the polymer matrix. The SEM observation provides the information about the morphological changes that arise in polymer matrix due to the incorporation of nano-Al2O3.

Characterization of molecular orientation under tensile deformation by near infrared spectroscopy

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Masami Mizushima ◽  
Takanobu Kawamura ◽  
Kenji Takahashi ◽  
Koh-hei Nitta
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Tensile Deformation ◽  
Crystal Form ◽  
Orientation Function ◽  
Chain Axis ◽  
Stretching Vibration ◽  
Novel Method

AbstractWe present a novel method for characterizing orientation behavior of typical polyethylene (PE) materials such as HDPE, LLDPE, and LDPE. The chain orientation to the stretching direction was examined under uniaxial deformation by near infrared spectroscopy. Then we obtained directly the orientation function of PE chain axis (c-axis) from the CH stretching vibration of NIR spectra as a function of extension time or strain. We compared the present method with the conventional infrared IR method where the orientation function of PE c-axis (chain-axis) has been indirectly obtained from the b-and a-axis’s assuming the orthogonal crystal form by using the CH2 rocking vibrations in IR spectra

scholarly journals Synthesis and characterization of the novel color-tunable Eu/Tb(BPA)3phen composites

2018 ◽  
Vol 207 ◽  
pp. 03021
Author(s):  
Guangbo Xie ◽  
Zijun Zhang ◽  
Jingjing Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Thermogravimetric Analysis ◽  
Decomposition Temperature ◽  
Initial Decomposition Temperature ◽  
Excellent Thermal Stability ◽  
Wide Range ◽  
Color Tunable ◽  
Scanning Electron

The new color-tunable luminescent Eu/Tb(BPA)3phen composites have been successfully fabricated by the solvothermal reactions. The characterization of the final products have been investigated by field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), Thermogravimetric analysis (TG-DSC) and Ultraviolet and visible (UV-Vis) spectrophotometer. It is found that the geometry of the composite particles is regular by scanning electron microscopy image. Thermogravimetric analysis indicates that the initial decomposition temperature of the final products is 334 °C, approximately. The results demonstrate that Eu/Tb(BPA)3phen composites have excellent thermal stability. And the products after decomposition are stable oxides (Eu2O3 and Tb2O3). Furthermore, Eu and Tb ions complexes exhibit strong red and green luminescence, respectively. Emitting color of physically blended Eu(BPA)3phen and Tb(BPA)3phen composites can be tuned in a wide range from red to yellow to green under the excitation of 350 nm single-wavelength ultraviolet light. The CIE coordinates of CTb, C1, C2, C3, C4, C5, C6 and CEu are calculated as (0.24, 0.60), (0.31, 0.56), (0.33, 0.55), (0.38, 0.52), (0.40, 0.51), (0.43, 0.48), (0.54, 0.41) and (0.65, 0.34), respectively. The color-tunable luminescent materials can be widely applications in many fields, such as the optical and electronic devices, fluorescent probe and labels.

scholarly journals Synthesis and Tribological Characterization of Ti3SiC2/ZnO Composites

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6088
Author(s):  
Rui Zhang ◽  
Wei Feng ◽  
Qi Wei ◽  
Shuai Ma
Keyword(s):  
Elevated Temperature ◽  
Decomposition Temperature ◽  
Oxidation Reactions ◽  
Inconel 718 Alloy ◽  
Initial Decomposition Temperature ◽  
Plasma Sintering ◽  
Different Temperatures ◽  
Spark Plasma ◽  
Tribological Characterization

Dense Ti3SiC2/ZnO composites were sintered at different temperatures by spark plasma sintering (SPS). The effects of sintering temperature on composition and mechanical properties of Ti3SiC2/ZnO composites were studied. The tribological behaviors of Ti3SiC2/ZnO composites/Inconel 718 alloy tribo-pairs at elevated temperature from 25 °C to 800 °C were discussed. The experimental results showed that the initial decomposition temperature of the Ti3SiC2/ZnO composite was 1150 °C, and Ti3SiC2 decomposed into TiC. When the decomposition temperature was higher than 1150 °C, the compositions of the Ti3SiC2/ZnO composites were Ti3SiC2, ZnO, and TiC. It was found that Ti3SiC2/ZnO composites had better self-lubricating performance than Ti3SiC2 at elevated temperature from 600 °C to 800 °C, which was owing to material transfers of tribo-pairs and sheared oxides generated by tribo-oxidation reactions.

A Novel Approach for Quantitative Characterization of Hydrolytic Action of Glycosidases to Glycoconjugates in Leather Manufacturing by Fengxiang Luo,1,2 Zhong Xiang,1,2 Zhang Chunxiao,1,2 Biyu Peng,1,2* and Zh

2020 ◽  
Vol 115 (7) ◽  
pp. 263-269
Author(s):  
Fengxiang Luo ◽  
Zhong Xiang ◽  
Zhang Chunxiao ◽  
Biyu Peng ◽  
Zhongzhen Long
Keyword(s):  
Enzyme Concentration ◽  
Quantitative Characterization ◽  
Established Method ◽  
Protein Conjugates ◽  
Leather Processing ◽  
Novel Approach ◽  
Novel Method ◽  
Main Components ◽  
Opening Up

Glycoconjugates, herein glyco-protein conjugates, composed of protein and saccharide chains are the main components of the interfibrillar matrix in skin which need to be fully removed in the leather making process. The application of glycosidases can assist unhairing and skin fiber opening-up, resulting in the improvement of leather quality, by breaking the glycoconjugates safely and efficiently in mild conditions. The biotechnology assisted by glycosidases, a big family of over 200 kinds of enzymes, has a great potential but the related mechanisms and the efficiency of different glycosidases are still not clear, which interferes with its wide application. To screen the proper glycosidases, a novel method of evaluating the catalytic hydrolysis properties of glycosidases towards skin glycoconjugates based a special hide powder substrate, simulating the actual leather processing, was established through detecting the produced amount of the total sugar in the solution. The special substrate was prepared, the determination conditions were optimized, then the performances of several typical glycosidases were evaluated and their application effects in soaking process of leather making were also investigated. The results show that the optimum testing conditions are lower than 4 h of the reacting time, optimally 2 h, and lower than 40 U/mL of the enzyme concentration, optimally 0-25 U/mL based on 2 g of the substrate; the results to evaluate the properties of some glycosidases based on the established method are positively related to their applying effects in soaking. The new method with better repeatability can be used as an available tool to correctly select glycosidases and optimize process parameters for correct use.

Preparation, Cross-Linking and Characterization of Novel Benzocyclobutene-Siloxane Polymers with Polysiloxane Mainchain and Silylbenzocyclobutene Pendant Groups

2012 ◽  
Vol 534 ◽  
pp. 178-183 ◽  
Author(s):  
Hui Ling Li ◽  
Ya Wen Hang ◽  
Ke Cao ◽  
Fang Hua Zhu ◽  
Jun Xiao Yang
Keyword(s):  
Ring Opening ◽  
Decomposition Temperature ◽  
Cross Linking ◽  
Initial Decomposition Temperature ◽  
Hydrosilylation Reaction ◽  
On Line ◽  
Ft Ir ◽  
Siloxane Polymers ◽  
Incorporation Ratio

A series of BCB-siloxane polymers with benzocyclobutene (BCB) pendant groups and polysiloxane mainchain was prepared by the hydrosilylation reaction between 4-(1,1-di-methyl-1-vinyl) silylbenzocyclobutene (4-DMVSBCB) and poly (methylhydrosiloxane) (PHMS) employing Pt/C as catalyst. Upon heating the BCB-siloxane polymers, the cross-linking occurred via ring-opening of benzocyclobutene as evidenced by on-line FT-IR, 1H NMR and 13C NMR. TGA examination indicates that the thermal stability was enhanced with increasing the incorporation ratio of BCB. Most importantly, the initial decomposition temperature of crosslinked BCB-siloxane resins is as high as 429 oC, showing a superior thermal resistance over most other BCB resins.

A Possible Basis for Nondestructive Characterization of Ropes of Nylon 6

1997 ◽  
Vol 503 ◽  
Author(s):  
H. Jiang ◽  
M. K. Davis ◽  
R. K. Eby ◽  
P. Arsenovic
Keyword(s):  
Tensile Strength ◽  
Service Life ◽  
Fiber Diameter ◽  
Structural Parameters ◽  
Crystal Form ◽  
Nylon 6 ◽  
Remaining Service Life ◽  
Nondestructive Characterization ◽  
Fractional Content

ABSTRACTPhysical properties and structural parameters have been measured for ropes of nylon 6 as a function of the number of use operations. The fractional content of the α crystal form, sound velocity, birefringence, tensile strength and length all increase systematically and significantly with increasing the number of use operations. The fractional content of the γ crystal form and fiber diameter decrease with use. These trends indicate that the measurement of such properties and structural parameters, especially the length, provide a possible basis for establishing a reliable, rapid, and convenient nondestructive characterization method to predict the remaining service life of nylon 6 ropes.

scholarly journals A novel approach to the computation of one-loop three- and four-point functions: I. The real mass case

2019 ◽  
Vol 2019 (11) ◽  
Author(s):  
J Ph Guillet ◽  
E Pilon ◽  
Y Shimizu ◽  
M S Zidi
Keyword(s):  
Building Blocks ◽  
The Real ◽  
Alternative Method ◽  
Novel Approach ◽  
Reduction Methods ◽  
Real Mass ◽  
Novel Method ◽  
Algebraic Reduction ◽  
The One ◽  
Mass Case

Abstract This article is the first of a series of three presenting an alternative method of computing the one-loop scalar integrals. This novel method enjoys a couple of interesting features as compared with the method closely following ’t Hooft and Veltman adopted previously. It directly proceeds in terms of the quantities driving algebraic reduction methods. It applies to the three-point functions and, in a similar way, to the four-point functions. It also extends to complex masses without much complication. Lastly, it extends to kinematics more general than that of the physical, e.g., collider processes relevant at one loop. This last feature may be useful when considering the application of this method beyond one loop using generalized one-loop integrals as building blocks.

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