scholarly journals Karakteristik Thermal Shortening Minyak Biji Karet, Minyak Ikan, dan Stearin Sawit Menggunakan Differential Scanning Calorimetry (DSC)

2021 ◽  
pp. 26-35
Author(s):  
Sumartini Sumartini ◽  
Nirmala Efri Hasibuan ◽  
Sellen Gurusmatika
Keyword(s):  
Differential Scanning Calorimetry ◽  
Melting Point ◽  
Scanning Calorimetry

Kendala yang sering dihadapi pada pembuatan produk spreads seperti shortening adalah sulitnya menghasilkan produk dengan titik leleh yang diharapkan. Interesterifikasi kimiawi dianggap lebih murah, sederhana, mudah dikontrol, suhu yang digunakan tidak terlampau tinggi sehingga memperkecil kemungkinan terbentuknya asam lemak trans. Tujuan penelitian ini adalah mengetahui karakteristik  profil thermal dan melting point dari shortening melalui dua modifikasi lipid yang berbeda, blending (NIE) dan interesterifikasi kimiawi (CIE). Metode penelitian yang digunakan adalah rancangan acak lengkap (RAL) dengan 10 rasio perlakuan untuk mengetahui karakteristik leleh shortening menggunakan DSC (Differential Scanning Calorimetry). Hasil penelitian menunjukkan nilai melting point berada dalam kisaran leleh suhu (40-49°C). Berdasarkan Karakteristik Thermal rasio 90/5/5 (CIE 4) dan 80/10/10 (CIE 3) memiliki 3 dan 4 puncak titik leleh yang yang rendah. Berdasarkan data tersebut dapat disimpulkan bahwa melting point dan profil thermal interesterifikasi kimiawi lebih rendah jika dibandingkan blending, hal ini membuktikan bahwa intereterifikasi kimiawi mampu menciptakan lemak shortening baru dengan plastisitas tertentu dan memberikan karakteristik leleh sesuai dengan shortening komersial.

scholarly journals Effect of the dispersion of the chromophore on the optical performances of polarizers from polyethylene and 5”-thio- (3-butyl)nonyl-2,2’:5’,2”-terthiophene

e-Polymers ◽  
2002 ◽  
Vol 2 (1) ◽  
Author(s):  
Andrea Pucci ◽  
Letizia Moretto ◽  
Giacomo Ruggeri ◽  
Francesco Ciardelli
Keyword(s):  
Electron Microscopy ◽  
Molecular Weight ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Melting Point ◽  
Drawing Ratio ◽  
Scanning Calorimetry ◽  
Affine Deformation ◽  
Ultra High Molecular Weight ◽  
Scanning Electron

AbstractA new polyethylene-compatible terthiophene chromophore, 5”-thio-(3- butyl)nonyl-2,2’:5’,2”-terthiophene, with melting point lower than 0°C was prepared and used for linear polarizers based on ultra-high-molecular-weight polyethylene (UHMWPE). Differential scanning calorimetry and scanning electron microscopy indicate that the new chromophore is dispersed uniformly in films of UHMWPE obtained by casting from solution. The films show excellent dichroic properties (dichroic ratio 30) at rather low drawing ratio (≈ 20) . Moreover, qualitative agreement is observed with the Ward pseudo-affine deformation scheme.

Effects of In and Sb addition on the thermal and wetting behavior of Sn-3.5Ag solder

2018 ◽  
Vol 30 (4) ◽  
pp. 233-240 ◽  
Author(s):  
Md Hasnine
Keyword(s):  
Differential Scanning Calorimetry ◽  
Melting Point ◽  
Thermal Behavior ◽  
Surface Finish ◽  
Design Methodology ◽  
Solder Alloys ◽  
Scanning Calorimetry ◽  
Content Type ◽  
Cu Substrate ◽  
Free Solder

Purpose This paper aims to investigate the effect of In and Sb additions on the thermal behavior and wettability of Sn-3.5Ag-xIn-ySb (x = 0, 1.0 and 1.5 Wt.%, y = 0, 1.0, 1.4 and 2.1 Wt.%) solder alloys. Design/methodology/approach The thermal behavior of the Pb-free solder alloys was studied using differential scanning calorimetry. Wetting balance experiments were performed in accordance with the IPC standard, IPC-TM-650 and at a temperature of 260°C. Also, a solder spread test was performed on a Cu surface finish using the JIS-Z-3197 solderability standard. Findings It is shown that among the selected Sn-3.5Ag-xIn-ySb (x = 0, 1.0 and 1.5 Wt.%, y = 0, 1.0, 1.4 and 2.1 Wt.%) alloys, Sn-3.5Ag-1.5In-1Sb showed the lowest melting point and the lowest undercooling temperature. The best wettability was achieved when the In and Sb contents were approximately 1.5 and 1.0 Wt.%, respectively. The effect of the combined addition of In and Sb on solder spreadability on a Cu substrate was also demonstrated. Originality/value It was found that adding approximately 1.5 and 1.0 Wt.% of In and Sb, respectively, in Sn-3.5Ag solder provided the best wetting performance and improved the solder spreadability.

scholarly journals Phase Polymorphism of [Co(DMSO)6](BF4)2 Studied by Differential Scanning Calorimetry

2006 ◽  
Vol 61 (3-4) ◽  
pp. 180-188 ◽  
Author(s):  
Anna Migdał-Mikuli ◽  
Łukasz Skoczylas ◽  
Elżbieta Szostak
Keyword(s):  
Differential Scanning Calorimetry ◽  
Phase Transitions ◽  
Melting Point ◽  
Title Compound ◽  
Metastable Phases ◽  
Scanning Calorimetry ◽  
Phase Polymorphism ◽  
Solid Phases ◽  
High Degree ◽  
Dynamical Disorder

Five solid phases of [Co(DMSO)6](BF4)2 have been detected by differential scanning calorimetry (DSC). Phase transitions were detected between the following solid phases: stable KIb↔ stable KIa at T̅C4 = (328±2) K, metastable KIII ↔ undercooled phase K0 at T̅C3 = (383±4) K, metastable KII ↔ undercooled K0 at T̅C2 = (399±2) K and stable KIa ↔ stable K0 at T̅C1 = (404±1) K. The title compound melts at Tm = 440 K. From the entropy changes at the melting point and at phase transitions it can be concluded that the phases K0 and undercooled K0 are orientationally dynamically disordered crystals. The stable phases KIa, KIb are ordered solid phases. The metastable phases KII and KIII are probably solid phases with a high degree of orientational dynamical disorder

Dynamic Mechanical and Crystallization Properties of PTT/EPDM-g-MA/OMMT Blends

2012 ◽  
Vol 466-467 ◽  
pp. 23-26
Author(s):  
Kun Yan Wang ◽  
Ying Ye ◽  
Xiao Qing Zhu ◽  
Feng Cao
Keyword(s):  
Differential Scanning Calorimetry ◽  
Melting Point ◽  
Maleic Anhydride ◽  
Dynamic Mechanical Analysis ◽  
Mechanical Analysis ◽  
Scanning Calorimetry ◽  
Ethylene Propylene ◽  
Dynamic Mechanical ◽  
Crystallization Properties ◽  
Trimethylene Terephthalate

The blends of poly(trimethylene terephthalate) (PTT) with ethylene-propylene-diene copolymer grafted with maleic anhydride (EPDM-g-MA) and organoclay(OMMT) were prepared by melt blending.The composites were characterized by dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC). The results suggest that the PTT is immiscible with EPDM-g-MA when OMMT was added to the blends. Strorage modulus of the PTT/EPDM-g-MA/OMMT are higher than those of pure PTT. The melting point of pure PTT and blends was almost constant. The crystallinity of the blends with OMMT were higher than that of pure PTT.

Synthesis and mesogenic properties of β-tetrabrominated tetraalkyloxyporphyrins

2008 ◽  
Vol 12 (01) ◽  
pp. 54-64 ◽  
Author(s):  
Puttaiah Bhyrappa ◽  
Chellaiah Arunkumar ◽  
Babu Varghese ◽  
Doddamane S. Shankar Rao ◽  
Subbarao K. Prasad
Keyword(s):  
Crystal Structure ◽  
Differential Scanning Calorimetry ◽  
Melting Point ◽  
Optical Microscopy ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Scanning Calorimetry ◽  
Point Temperature ◽  
New Class ◽  
Clearing Point

A new class of 2,3,7,8-tetrabromo-5,10,15,20-tetrakis(4'-n-1-alkyloxyphenyl)porphyrins, H 2 T (4'- OC n P ) PBr 4 (n = 4,6,8,10,12,14,16 and 18) and their Cu(II) complexes have been synthesized regioselectively and their mesophase properties explored. The mesogenic properties of the porphyrins were examined by differential scanning calorimetry and optical microscopy. An increase in alkyl chain length of the mesogens, showed an increase in melting point temperature and lowering of their clearing point temperatures with the narrower mesophases. This has been ascribed to the decreased π-π interactions as evidenced from the crystal structure of H 2 T (4'- OC 6 P ) PBr 4· THF derivative. MT (4'- OC n P ) PBr 4 derivatives showed rectangular mesophases in contrast to discotic lamellar mesophases reported for the planar MT (4'- OC n P ) P mesogens.

Thermal Properties of Hyperbranched Polymer/HTPB-PU IPN

2013 ◽  
Vol 575-576 ◽  
pp. 76-80
Author(s):  
Xue Jing Song ◽  
Yun Jun Luo
Keyword(s):  
Differential Scanning Calorimetry ◽  
Glass Transition ◽  
Thermal Properties ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Melting Point ◽  
Hyperbranched Polymer ◽  
Isophorone Diisocyanate ◽  
Scanning Calorimetry

Hyperbranched polymer/HTPB-PU IPNs were prepared, when HTPB (hydroxyl-terminated polybutadiene) and IPDI (isophorone diisocyanate) were cured into polyurethane (HTPB-PU) at the existence of hyperbranched polymer. Differential scanning calorimetry (DSC) was adopted to study the influence of hyperbranched polymer on thermal properties of HTPB-PU, while IPNs were formed. The result shows that the existance of hyperbranched polymer makes glass transition temperature of HTPB-PU reduces by around 2°C and that HTPB-PU lowers the melting point of hyperbranched polymer. Hyperbranched polymer plays a role of internal plasticization on HTPB-PU, and HTPB-PU influences crystallization of hyperbranched polymer in return.

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