Preparation of Starch/PS-g-MAH Blends and Effect on Controlled Release of Herbicide

2011 ◽  
Vol 415-417 ◽  
pp. 1231-1234
Author(s):  
Li Min Tai
Keyword(s):  
Electron Microscope ◽  
Composite Materials ◽  
Controlled Release ◽  
Ph Value ◽  
Basic Medium ◽  
Neutral Medium ◽  
Chemically Modified ◽  
Single Screw ◽  
Impact Of Pesticides ◽  
Scanning Electron

PS was chemically modified by grafting with maleic anhydride to obtain PS-g-MAH on a single-screw extrude. The blending of starch and PS-g-MAH was carried out to prepare the degradable composite materials by melt extrusion on the extruder. The fractured surfaces of the blends were observed and discussed with the different incorporation of starch by a scanning electron microscope (SEM). The results exhibited that MAH improved the component compatibility of the blends. Then the starch/PS-g-MAH blends were used as the carrier for preparing bensulfuron-methyl CRFs. The bensulfuron-methyl CRFs’ release performance was investigated in the different pH value media by UV analysis. It was shown that the starch/PS-g-MAH matrix has obvious controlled-release function, and the release rate in a basic medium is much higher than in an acidic or neutral medium. The bensulfuron-methyl CRFs should have the longer validity in acidic soil, and have an important potential in reducing inefficient use and impact of pesticides in the environment.

Fabrication and Properties of Lignin/Castor Oil-Based Composites

2011 ◽  
Vol 311-313 ◽  
pp. 1535-1538 ◽  
Author(s):  
Hong Juan Wang ◽  
Hai Yan Xiao ◽  
Feng Qiang Sun ◽  
Jian Hua Zhang
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Free Radical ◽  
Composite Materials ◽  
Scanning Electron Microscope ◽  
Castor Oil ◽  
Morphology And Structure ◽  
The Matrix ◽  
Facile Route ◽  
Scanning Electron

Novel bio-based composites were developed from maleate castor oil (MACO) and lignin through free radical initiated copolymerization between MACO and diluent monomer styrene(St). The morphology and structure of the composites were characterized by Fourier transform infrared spectroscope (FTIR) and scanning electron microscope (SEM). The mechanical and thermal behaviors of the composites were investigated, which showed the incorporation of a little of lignin in the castor oil based polymer can enhance the tensile properties of the matrix polymer greatly. This work provides a facile route to prepare bio-based composite materials from castor oil and lignin and can be extended to prepare other bio-based materials from reproducible resources.

Tensile Property Evaluation of Carbon Fiber Reinforced Aluminium Sandwich Composites

2014 ◽  
Vol 984-985 ◽  
pp. 345-349 ◽  
Author(s):  
U. Tamilarasan ◽  
L. Karunamoorthy ◽  
K. Palanikumar
Keyword(s):  
Electron Microscope ◽  
Composite Materials ◽  
Tensile Property ◽  
Composite Laminates ◽  
Sandwich Composite ◽  
Property Evaluation ◽  
New Applications ◽  
Fractured Surface ◽  
Scanning Electron ◽  
Better Than

Composite materials are finding new applications in many situations and are better than the conventional materials because of their excellent properties. In the present investigation, aluminium sandwich composite laminates are fabricated and their tensile property is evaluated. The structure of the composites and their fractured surface are studied by using Scanning Electron Microscope. The analysis of the experimental results indicated that the incorporation of aluminium stack as sandwich improves the properties and can be used as a structural material for construction.

Effects of Environmental Exposure on Ductile-Phase Toughening in Niobium Silicide-Niobium Composites

1993 ◽  
Vol 322 ◽  
Author(s):  
Joseph D. Rigney ◽  
Preet M. Singh ◽  
John J. Lewandowski
Keyword(s):  
Electron Microscope ◽  
Composite Materials ◽  
Crack Extension ◽  
Resistance Curve ◽  
Test Results ◽  
Ductile Phase ◽  
Processing Techniques ◽  
Scanning Electron

AbstractA variety of materials have been toughened by incorporating ductile phases. Brittle silicide intermetallics such as Nb5Si3 composited with niobium particles incorporated during in situ processing techniques have realized significant improvements in toughness and stable crack extension. In the present work, toughness tests conducted on Nb5Si3/Nb materials monitored in a scanning electron microscope were instrumental in viewing the role of the deforming niobium particles on the process of toughening. In particular, the behavior of the ductile phase was monitored and related to the toughness values obtained. In an attempt to vary the behavior of the ductile phase, the composite materials were exposed to a variety of gaseous environments and subsequently tested in air. The resulting toughness, resistance-curve behavior, and in situ test results highlight the importance of the behavior of the ductile phase on subsequent properties.

Fabrication of Accurate Diamond - Metal Composite Cutting Blade by Electrotyping Method

2006 ◽  
Vol 304-305 ◽  
pp. 57-61
Author(s):  
L.L. Fang ◽  
Bing Lin Zhang ◽  
Ning Yao
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Ph Value ◽  
Photoemission Spectroscopy ◽  
Metal Composite ◽  
X Ray Diffraction ◽  
Electrolytic Solution ◽  
X Ray ◽  
Scanning Electron

In this paper, we report that the experimental results of fabricated diamond-metal composite film. Electrotyping method was used to deposit the thick film. During the deposition, low internal stress electrolytic solution, the electric current density of cathode, PH value, temperature, the distance between cathode and anode, the pretreatment of motherboard cathode were selected simultaneously. It was found that stirring strongly affected the quality of the film. Especially stirring velocity affected the distribution of diamond grains. Scanning electron microscope (SEM), X-ray photoemission spectroscopy (XPS) and X-ray diffraction (XRD) were used to measure the surface morphology, the crystal microstructure, diamond grains distribution and the chemical environment of the film.

Microwave-Assisted Hydrothermal Preparation of YVO4:Eu3+ Phosphor

2010 ◽  
Vol 663-665 ◽  
pp. 417-420
Author(s):  
En Guo Wang
Keyword(s):  
Electron Microscope ◽  
Ph Value ◽  
Doping Amount ◽  
Hydrothermal Preparation ◽  
X Ray ◽  
Microwave Assisted ◽  
Preparation Conditions ◽  
Microwave Hydrothermal ◽  
Microwave Hydrothermal Method ◽  
Scanning Electron

YVO4:Eu3+ phosphors were prepared by microwave hydrothermal method in this work. YVO4:Eu3+ phosphors were probed by photoluminescence (PL), X-ray powder diffraction (XRD) and scanning electron microscope (SEM). The effects of different preparation conditions on the photoluminescence, the structure and the morphology of YVO4:Eu3+ phosphors were studied. The experiment results show that the pH value and the Eu3+ doping amount have some important effect on the photoluminescence and the morphology of YVO4:Eu3+phosphors.

Preparation and Thermodynamics of Nickel-Phosphor Deposition on Surface of Quartz Optical Fiber by Electroless Plating

2011 ◽  
Vol 322 ◽  
pp. 432-435
Author(s):  
Bo Quan Jiang ◽  
Zheng Qiang Xiao
Keyword(s):  
Electron Microscope ◽  
Optical Fiber ◽  
Ph Value ◽  
Fiber Surface ◽  
Electroless Nickel ◽  
Optimal Conditions ◽  
Single Factor ◽  
Quartz Optical Fiber ◽  
Scanning Electron ◽  
Strength Of Adhesion

The electroless nickel-phosphor deposition on quartz optical fiber surface was carried out by single factor test. The optimum NiSO4·6H2O, NaH2PO2·H2O , C3H6O2 and H3BO3 concentrations, pH value and temperature were determined to be: 0.1331 mol/L, 0.3019 mol/L, C3H6O20.3761 mol/L, H3BO3 0.4520 mol/L, 4.5 and 84°C, respectively. Scanning electron microscope, stereomicroscope and thermal shock rest were applied to measure the morphology and strength of adhesion of the deposited Ni-P coating. The result showed that a desired Ni-P coating with good smoothness and adhesion was prepared under the optimal conditions. The thermodynamic models were established and proven by the current study.

Investigation of Flexural Characteristics of Flax and Abaca Hybrid Epoxy Composites

2015 ◽  
Vol 766-767 ◽  
pp. 183-186 ◽  
Author(s):  
B. Vijaya Ramnath ◽  
C. Elanchezhian ◽  
C.V. Jayakumar ◽  
V.M. Manickavasagam ◽  
U.S. Aswin ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Composite Materials ◽  
Scanning Electron Microscope ◽  
Crack Propagation ◽  
Hybrid Composite ◽  
Epoxy Composite ◽  
Epoxy Composites ◽  
New Materials ◽  
Industrial Needs ◽  
Scanning Electron

Recent growth in the field of engineering demands specialised composite materials to meet various industrial needs. Composite materials are emerging as the most promising new materials. This paper deals with the fabrication and analysis of flexural characteristics of flax and Abaca hybrid epoxy composite. The show that GFRP + Flax +Abaca based hybrid composite has a higher ultimate stress which is much greater than GFRP + Flax composite and GFRP + Abaca composites. The inner filament breakage and crack propagation are studied using scanning electron microscope.

scholarly journals ANALISIS PENGARUH VARIASI WAKTU SINTERING DAN KOMPOSISI TERHADAP SIFAT MEKANIK DAN MORFOLOGI KOMPOSIT ECENG GONDOK-PVC-LDPE

2021 ◽  
Vol 6 (2) ◽  
pp. 73
Author(s):  
Novi Laura Indrayani ◽  
R Hengki Rahmanto ◽  
Riri Sadiana
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Composite Materials ◽  
Scanning Electron Microscope ◽  
Chemical Properties ◽  
Industrial Sector ◽  
Small Scale ◽  
Sintering Time ◽  
The Impact ◽  
Scanning Electron

“Pemanfaatan material komposit pada saat ini semakin berkembang, seiring dengan meningkatnya penggunaan bahan tersebut yang semakin meluas mulai dari yang sederhana sampai sektor industri. Hal ini dikarenakan karakteristik material komposit mempunyai banyak kelebihan dibandingkan dengan jenis bahan lain yaitu  ringan, kuat, tidak terpengaruh korosi dan mampu bersaing dengan logam, dengan tidak kehilangan karakteristik dan kekuatan mekanisnya. Penelitian ini bertujuan untuk mengetahui pengaruh variasi waktu sintering dan komposisi terhadap ketangguhan impak dan kekerasan komposit Eceng Gondok-PVC-LDPE. Bahan yang digunakan merupakan tanaman gulma dan limbah plastik. Proses pembuatan spesimen dilakukan dengan metode pressured sintering, yaitu dengan cara pembuatan serbuk, dan di screening 60 mesh. Selanjutnya serbuk di mixing dengan variasi komposisi perbandingan K1: EG 50%, PVC 10%, LDPE 40%; K2: EG 55%, PVC 10%, LDPE 35%; K3: EG 60%, PVC 10%, LDPE 30%; K4: EG 65%, PVC 10%, LDPE 25% dan K5: EG 70%, PVC 10%, LDPE 20% dan dikompaksi dengan tekanan 1,013 bar. Selanjutnya di sintering dengan temperatur 1800C. Pada penilitian ini variasi waktu sintering yaitu; 5 menit, 8 menit, 10 menit, 13 menit dan 15 menit. Sifat mekanik dilihat dari nilai kekerasan dan impak dengan menggunakan standar ISO 2039-1:2001, ISO 179-1:2010. Selain itu menganalisis morfologi dengan Scanning Electron Microscope (SEM). Pengujian untuk sifat kimia dilihat dengan analisis morfologi SEM. Berdasarkan hasil pengujian sifat mekanik didapatkan nilai kekerasan tertinggi dimiliki oleh komposit K2 sebesar 22.30 MPa dan 2.1 kJ/m2 untuk nilai impak.” Kata kunci: eceng gondok, komposit, LDPE, pressured sintering, PVC. Abstract“The utilization of composite materials nowadays is currently growing, along with the increasing use of these materials, which are expanding ranging from the small scale to the industrial sector. This is because the characteristics of composite materials have many advantages compared to other types of materials i.e. light, strong, not affected by corrosion and able to compete with metals without losing their mechanical characteristics and strength. This research aims to determine the effect of variations in sintering time and it’s composition against impact toughness and hardness of the Water Hyacinth-PVC-LDPE composite. The materials used are weeds and plastic waste. The process of specimen fabrication was performed by using pressured sintering method, i.e. by making it into powder and were screening by using screen 60 mesh. Furthermore, the powder were mixed with the variation of the composition K1: EG 50%, PVC 10%, LDPE 40%; K2: EG 55%, PVC 10%, LDPE 35%; K3: EG 60%, PVC 10%, LDPE 30%; K4: EG 65%, PVC 10%, LDPE 25% dan K5: EG 70%, PVC 10%, LDPE 20% and compacted with a pressure of 1,1013 bar. After that is sintering with temperature 180oC. In this research the sintering time variations is 5 minute, 8 minute, 10 minute, 13 minute and 15 minute. Mechanical properties if were seen from the hardness and impact values by using a standard ISO 2039-1:2001, ISO 179-1:2010. In additions to analyze the morphology by using a Scanning Electron Microscope (SEM). Tests for chemical properties can be seen with the morphological analysis of SEM. Based on the testing results, the mechanical properties obtained the highest hardness value owned by a composite K2 by 22.30 MPa and 2.1 kJ/m2 for the value of the impact.” Kata kunci:water hyacinth, composite, LDPE, pressured sintering, PVC.

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