scholarly journals Study on the improvement of hydrophilic character on polyvinylalcohol treated polyester fabric

2014 ◽  
Vol 16 (4) ◽  
pp. 21-27
Author(s):  
Pitchai S. ◽  
Jeyakodi Moses J. ◽  
Swarna Natarajan
Keyword(s):  
Differential Scanning Calorimetry ◽  
Electron Microscope ◽  
Water Retention ◽  
Polyester Fabric ◽  
Spot Test ◽  
Disperse Dye ◽  
Scanning Calorimetry ◽  
Pet Fabric ◽  
Hydrophilic Character ◽  
Scanning Electron

Abstract Polyester fabric was treated with polyvinyl alcohol in alkaline medium. The moisture regain, water retention and wettability of the PVA treated polyester fabric were tested. The PVA treated PET fabric was dyed with disperse dye. The presence of PVA in the treated PET fabric was assessed by spot test. The treated fabric was also characterized by scanning electron microscope, FTIR and differential scanning calorimetry. The PVA treated polyester fabric showed improved hydrophilic character over intact and sodium hydroxide treated PET fabrics.

scholarly journals Calorimetric study on Bi-Cu-Sn alloys

2019 ◽  
Vol 38 (2019) ◽  
pp. 541-546
Author(s):  
Jolanta Romanowska
Keyword(s):  
Differential Scanning Calorimetry ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Temperature Interval ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
Calorimetric Study ◽  
Calorimetric Investigation ◽  
Scanning Calorimetry ◽  
Scanning Electron

AbstractThe paper presents results of calorimetric investigation of the Bi-Cu-Sn system by means of differential scanning calorimetry (DSC) at the temperature interval 25-1250∘C, Values of liquidus, solidus and invariant reactions temperatures, as well as melting enthalpies of the selected alloys were determined. Microstructure investigation of the alloys were performed by the use of a scanning electron microscope (SEM) equipped with an energy-dispersive spectrometer (EDS).

RETRACTED: Fabrication of Poly(Lactic Acid) Nanofibers by Cotton Candy Method

2017 ◽  
Vol 728 ◽  
pp. 193-198
Author(s):  
Rutchaneekorn Wongpajan ◽  
Supaphorn Thumsorn ◽  
Hiroyuki Inoya ◽  
Masayuki Okoshi ◽  
Hiroyuki Hamada
Keyword(s):  
Differential Scanning Calorimetry ◽  
Lactic Acid ◽  
Thermal Properties ◽  
Electron Microscope ◽  
Air Pressure ◽  
Poly Lactic Acid ◽  
Scanning Calorimetry ◽  
Cotton Candy ◽  
Nozzle Temperature ◽  
Scanning Electron

The poly (lactic acid) (PLA) fiber of biodegradable polymer was fabricated by cotton candy method with small nozzle. The air pressure was varied from 0.2-0.5 MPa with nozzle temperature of 210-260°C. The morphology of fiber was determined by scanning electron microscope (SEM). Thermal properties were examined using differential scanning calorimetry (DSC). SEM results suggested that diameters the PLA fiber at temperature 250°C and air pressure of 0.2 MPa were smaller than the fiber at low and high temperature. The sizes of the fibers were lower than 1 μm and the fibers were irregular size. Crystallinity significantly decreased when increasing barrel temperatures while it slightly changed when varied air pressure. The productivity of PLA fibers was around 30-180 g/h depended on controlled the nozzle temperature and the air pressure.

scholarly journals Karakterisasi Paduan AlMgSi Untuk Kelongsong Bahan Bakar U3Si2/Al Densitas Uranium 5,2 gU/cm3

2018 ◽  
Vol 24 (1) ◽  
Author(s):  
Aslina Br. Ginting ◽  
Supardjo Supardjo ◽  
Yanlinastuti Yanlinastuti ◽  
Dian Anggraini ◽  
Boybul Boybul
Keyword(s):  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Differential Thermal Analysis ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Interface Bonding ◽  
Scanning Calorimetry ◽  
Scanning Electron

Meningkatnya densitas uranium dari 2,96 gU/cm3 menjadi 5,2 gU/cm3 bahan bakar U3Si2/Al harus diikuti dengan penggunaan kelongsong yang kompatibel. Bahan bakar berdensitas tinggi mempunyai kekerasan yang tinggi, sehingga bila menggunakan paduan AlMg2 sebagai kelongsong dapat menyebabkan terjadi dogbone pada saat perolan. Selain fenomena dogbone, pada saat bahan bakar tersebut digunakan di reaktor dapat terjadi swelling karena meningkatnya hasil fisi maupun burn up. Oleh karena itu, perlu dicari pengganti bahan kelongsong untuk bahan bakar U3Si2/Al densitas tinggi. Pada penelitian ini telah dilakukan karakterisasi paduan AlMgSi sebagai kandidat pengganti kelongsong AlMg2. Karakterisasi yang dilakukan meliputi analisis termal, kekerasan, mikrostruktur dan laju korosi. Analisis termal dilakukan menggunakan DTA (Differential Thermal Analysis) dan DSC (Differential Scanning Calorimetry). Analisis kekerasan menggunakan alat uji kekerasan mikro, mikrostruktur menggunakan SEM (Scanning Electron Microscope) dan analisis laju korosi dilakukan dengan pemanasan pada temperatur 150 oC selama 77 jam di dalam autoclave. Hasil analisis menunjukkan bahwa kelongsong AlMgSi maupun AlMg2 mempunyai kompatibilitas panas dengan bahan bakar U3Si2/Al cukup stabil hingga temperatur 650 oC. Kelongsong AlMgSi mempunyai kekerasan sebesar 115 HVN dan kelongsong AlMg2 sebesar 70,1 HVN. Sementara itu, analisis mikrostruktur menunjukkan bahwa morfologi ikatan antarmuka (interface bonding) kelongsong AlMgSi lebih baik dari kelongsong AlMg2, demikian halnya dengan laju korosi bahwa kelongsong AlMgSi mempunyai laju korosi lebih kecil dibanding kelongsong AlMg2. Hasil karakterisasi termal, kekerasan, mikrostruktur dan laju korosi menunjukkan bahwa PEB U3Si2/Al densitas 5,2 gU/cm3 menggunakan kelongsong AlMgSi lebih baik dibanding PEB U3Si2/Al  densitas 5,2 gU/cm3  menggunakan kelongsong AlMg2.Kata kunci: U3Si2/Al, densitas 5,2 gU/cm3, kelongsong AlMgSi dan AlMg2.

Modification of Polyester Textiles for Easier Dyeing with Disperse Dyes

2020 ◽  
Vol 7 (5) ◽  
pp. 9-16
Author(s):  
Marija Kodric ◽  
Dragan Djordjevic
Keyword(s):  
Differential Scanning Calorimetry ◽  
Polyester Fabric ◽  
Disperse Dyes ◽  
Disperse Dye ◽  
Primary Alcohols ◽  
Scanning Calorimetry ◽  
Absorption Properties ◽  
Fiber Modification ◽  
Polyester Fibers ◽  
Polyester Dyeing

Modification of polyester fibers for more economical dyeing at lower temperatures without a carrier are considered in this study. Polyester dyeing is carried out industrially under rigorous conditions at high temperatures and under increased air pressure, and are treated with various solvents (primary alcohols) to make the fibers more permeable. As a result, the sorption properties, as well as the disperse dye dyeing ability, are improved. Dyeing of a modified polyester fabric at lower temperatures yielded better results than the standard dyeing of the unmodified polyester under the same conditions. The effects of fiber modification were analyzed through water absorption properties, wetting, swelling, differential scanning calorimetry (DSC), and Fourier transform infrared (FTIR) methods, and the degree of dyeing of the fabric was evaluated using CIELab parameters.

Preparation of Poly(Vinylidene Fluoride)/Silica Composite Nanofiber by Electrospinning Technique

2015 ◽  
Vol 804 ◽  
pp. 84-87 ◽  
Author(s):  
Moragote Buddhakala ◽  
Anchan Muakngam
Keyword(s):  
Differential Scanning Calorimetry ◽  
Electron Microscope ◽  
Mixed Solvent ◽  
Vinylidene Fluoride ◽  
Composite Membranes ◽  
Scanning Calorimetry ◽  
Electrospinning Technique ◽  
Composite Nanofiber ◽  
Poly Vinylidene Fluoride ◽  
Scanning Electron

A composite nanofiber containing poly (vinylidene fluoride) (PVDF) and silica (SiO2) were prepared by electrospinning of their mixtrues.The various amount of SiO2 nanoparticle was add with 15 wt.% PVDF solution in mixed solvent of N,N-dimethylacetamine (DMAc) : acetone at a ratio of 4:6 with the applied voltage of 8 kV, tip to collector distance of 10 cm and flow rate of 1 ml/hr. The morphology of the PVDF/SiO2 membranes was investigated by scanning electron microscope (SEM). The effect of SiO2 concentration on the morphology of the composite membranes were discussed. Crystallinity of the composite membranes was investigated by differential scanning calorimetry (DSC). It was found that SiO2 concentration have significant influence on the morphology and crystallinity of PVDF/SiO2 membranes.

The Mechanical Properties and Thermodynamic Study on Polypropylene/Talc Composites

2014 ◽  
Vol 915-916 ◽  
pp. 751-754
Author(s):  
Shao Hui Wang
Keyword(s):  
Mechanical Properties ◽  
Differential Scanning Calorimetry ◽  
Tensile Strength ◽  
Electron Microscope ◽  
Impact Strength ◽  
Scanning Electron Microscope ◽  
Stearic Acid ◽  
Crystallization Rate ◽  
Scanning Calorimetry ◽  
Scanning Electron

The composites of PP/Talc modified by stearic acid were prepared and its effect on the properties of PP/Talc composites was investigated in this paper. The tensile strength and impact strength of PP/Talc composites increased about 15% and 30% compared with pure PP respectively. Based on surface analysis by scanning electron microscope (SEM), the Talcparticles buried well in PP matrix when the Talc was coated with the stearic acid. At the same time, it was found that Talc significantly increased the crystallization temperature and crystallization rate of PP by differential scanning calorimetry (DSC).

scholarly journals EKSTRUKSI DAN KARAKTERISASI FILAMEN KOMPOSIT POLYLACTID ACID (PLA) / CARBON NANO TUBE (CNT)

2021 ◽  
Vol 2 (2) ◽  
pp. 12
Author(s):  
Dicky Oktavian ◽  
Budi Arifvianto ◽  
Muslim Mahardika
Keyword(s):  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Electron Microscope ◽  
Additive Manufacturing ◽  
Fused Deposition Modelling ◽  
Scanning Calorimetry ◽  
Fused Deposition ◽  
Carbon Nano Tube ◽  
Scanning Electron

Dewasa ini teknologi additive manufacturing (AM) mengalami perkembangan yang pesat. Salah satu metode additive manufacturing yang saat ini populer di berbagai belahan dunia adalah metode fused deposition modelling. Prinsip kerja metode ini adalah dengan cara mengekstrusi material filamen polimer yang meleleh dan sudah melewati temperatur rekristalisasinya melalui sebuah nozzle, kemudian produk akan terbentuk secara lapis demi lapis yang dibentuk melalui gerakan relatif dari meja mesin. Dalam pengaplikasiannya, material filamen dapat dibuat dalam bentuk komposit sehingga diperoleh sifat-sifat unik tertentu sehingga dapat digunakan pada bidang-bidang tertentu. Salah satunya adalah pada bidang kesehatan, sebagai pembuatan implan atau jaringan tubuh dengan memiliki kekuatan yang tinggi dan bersifat biodegradable. Pada penelitian ini, dilakukan pembuatan filamen komposit PLA-CNT dengan metode ekstrusi. Proses ekstrusi dilakukan dengan variasi temperatur 143, 145, dan 147ºC dengan memberi tambahan polyethylene glycol (PEG) sebagai plasticizer untuk meningkatkan fleksibilitas dan workability. Hasil pengamatan dengan scanning electron microscope (SEM) mengindikasikan bahwa proses ekstrusi berjalan kurang stabil karena terdapat tekstur permukaan yang bergelombang. Dari pengujian karakterisasi differential scanning calorimetry (DSC), derajat kristalinitas pada variasi ekstrusi filamen PLA-CNT mengalami peningkatan seiring meningkatnya temperatur ekstrusi. Pada pengujian karakterisasi fourier transform infrared spectroscopy (FTIR) terdapat perubahan komposisi kimia pada filamen yang signifikan, yang juga sejalan dengan degradasi sifat mekanis. Variasi filamen dengan temperatur ekstrusi 147ºC memiliki nilai kekerasan paling tinggi yaitu sebesar 40,50 MPa.

MORFOLOGI DAN PROPERTI CAMPURAN KARET ALAM/POLYPROPYLENE YANG DIVULKANISASI DINAMIK DALAM INTERNAL MIXER

REAKTOR ◽  
2007 ◽  
Vol 11 (2) ◽  
pp. 71
Author(s):  
Bahruddin Bahruddin ◽  
Sumarno Sumarno ◽  
Gede Wibowo ◽  
Nonot Suwarno
Keyword(s):  
Differential Scanning Calorimetry ◽  
Tensile Strength ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Scanning Calorimetry ◽  
Elongation At Break ◽  
Izod Impact ◽  
Internal Mixer ◽  
Scanning Electron

Morfologi dan properti campuran (blend) karet alam jenis SIR-20/polypropylene (NR/PP) yang divulkanisasi dinamik dalam internal mixer telah dipelajari. Blend dibuat dengan rasio berat NR/PP 10/90, 20/80, 50/50, 60/40 dan 70/30 dan komposisi sulfur 3 dan 5 phr (per hundred rubber). Proses pencampuran dilakukan pada suhu 180 oC dan kecepatan rotor 60 rpm. Analisa morfologi menggunakan SEM (Scanning Electron Microscope) dan DSC (Differential Scanning Calorimetry). Properti mekanik yang diukur meliputi tensile strength, elongation at break, izod impact, tearing dan hardness, berdasarkan standar ASTM. Didapatkan bahwa peningkatan rasio NR/PP menghasilkan distribusi partikel NR yang makin merata dengan ukuran yang makin kecil. Morfologi blend menunjukkan sistem dua fasa dan vulkanisasi fasa NR terjadi secara parsial dalam matrik PP. Peningkatan rasio NR/PP dan komposisi sulfur dapat meningkatkan properti elongation at break, namun menurunkan properti tensile strength, izod impact, tearing dan hardness. Elongation at break tertinggi yang dapat diperoleh adalah 70% pada rasio blend NR/PP 70/30 dan komposisi sulfur 5 phr.

Anti-Corrosion Performance of Four Zinc-Rich Coatings

2012 ◽  
Vol 598 ◽  
pp. 561-564
Author(s):  
Zhi Ming Cao ◽  
Guo Xin Li ◽  
Yi Liang Peng ◽  
Da Wei Hu
Keyword(s):  
Differential Scanning Calorimetry ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Steel Substrate ◽  
Salt Spray ◽  
Zinc Content ◽  
Neutral Salt ◽  
Corrosion Performance ◽  
Scanning Calorimetry ◽  
Scanning Electron

Four zinc-rich coatings were applied onto steel substrate and then placed in neutral salt spray for 4000 h in order to study the anti-corrosion performance of the coatings. The results showed that the samples with two kinds of the coatings were more seriously eroded than the others. The reasons could be that the zinc particles were dispersed inhomogeneous in the binder and the zinc content was very lower than 96 wt. % obtained through the analysis of Scanning Electron Microscope and Differential Scanning Calorimetry.

scholarly journals Thermal performance of cellulose acetate/tea polyphenol nanofibers

2015 ◽  
Vol 19 (4) ◽  
pp. 1327-1329
Author(s):  
Zhu-Xin Zhao ◽  
Shuang Tian ◽  
Li-Hong Chen ◽  
Meng-Di Wang ◽  
Ping Wang
Keyword(s):  
Differential Scanning Calorimetry ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Surface Morphology ◽  
Cellulose Acetate ◽  
Thermal Performance ◽  
Dimethyl Formamide ◽  
Tea Polyphenol ◽  
Scanning Calorimetry ◽  
Scanning Electron

In this paper, the cellulose acetate/tea polyphenol nanofibers are manufactured by electrostatic spinning technique. The surface morphology and thermal property of obtained nanofibers are characterized via scanning electron microscope, thermal gravity analysis, and differential scanning calorimetry. Different concentrations of cellulose acetate/dimethyl formamide solutions are prepared before sonicated tea polyphenol powder was added. The diameter of cellulose acetate/tea polyphenol nanofibers increases with the increase of the cellulose acetate component.

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