Preparation and characterization of high melt strength thermoplastic polyester elastomer with different topological structure using a two-step functional group reaction

Polymer ◽  
2019 ◽  
Vol 179 ◽  
pp. 121628 ◽  
Author(s):  
Rui Jiang ◽  
Yichong Chen ◽  
Shun Yao ◽  
Tao Liu ◽  
Zhimei Xu ◽  
...  
Keyword(s):  
Topological Structure ◽  
Functional Group ◽  
Melt Strength ◽  
Group Reaction

Minimal Sets on Graphs and Dendrites

2003 ◽  
Vol 13 (07) ◽  
pp. 1721-1725 ◽  
Author(s):  
Francisco Balibrea ◽  
Roman Hric ◽  
L'ubomír Snoha
Keyword(s):  
Topological Structure ◽  
Partial Characterization ◽  
Minimal Set ◽  
Full Characterization ◽  
Minimal Sets ◽  
Continuous Maps

The topological structure of minimal sets of continuous maps on graphs, dendrites and dendroids is studied. A full characterization of minimal sets on graphs and a partial characterization of minimal sets on dendrites are given. An example of a minimal set containing an interval on a dendroid is given.

Preparation and characterization of functional group gradient surfaces

1994 ◽  
Vol 32 (8) ◽  
pp. 1569-1579 ◽  
Author(s):  
Jin Ho Lee ◽  
Heoung Woo Kim ◽  
Pyong Ki Pak ◽  
Hai Bang Lee
Keyword(s):  
Functional Group ◽  
Gradient Surfaces

Synthesis and Characterization of Bio-Based Rigid Polyurethane Foams with Varying Amount of Blowing Agent

2019 ◽  
Vol 803 ◽  
pp. 346-350
Author(s):  
Jessalyn C. Grumo ◽  
Lady Jaharah Y. Jabber ◽  
Arnold A. Lubguban ◽  
Rey Y. Capangpangan ◽  
Arnold C. Alguno
Keyword(s):  
Polyurethane Foam ◽  
Functional Group ◽  
Polyurethane Foams ◽  
Synthesis And Characterization ◽  
Rigid Polyurethane Foam ◽  
Sem Images ◽  
Average Cell Size ◽  
Average Cell ◽  
Blowing Agent

We report on the rigid polyurethane foam (RPUF) with varying amount of blowing agent. The effects of blowing agent in the formation of polyurethane will be characterized using scanning electron microscopy (SEM) and fourier transform infrared (FTIR) spectroscopy. SEM images revealed that varying the amount of blowing agent will significantly change the surface morphology of the resulting RPUF. The average cell size of the RPUF increases with increasing amount of blowing agent. Moreover, FTIR results revealed the presence of functional group related to formation of urethane bonds such as N-H, C=O, C=N and C-O-C stretching suggesting that polyurethane foam was successfully synthesized. This simple and straightforward process of RPUF using water as blowing agent will be economical.

THE ANATOMY AND FUNCTION OF A SEGMENT OF THE X CHROMOSOME OF DROSOPHILA MELANOGASTER

Genetics ◽  
1972 ◽  
Vol 71 (1) ◽  
pp. 139-156
Author(s):  
B H Judd ◽  
M W Shen ◽  
T C Kaufman
Keyword(s):  
Drosophila Melanogaster ◽  
X Chromosome ◽  
Functional Group ◽  
Deletion Mapping ◽  
Mutant Type ◽  
Functional Units ◽  
Average Size ◽  
And Function

ABSTRACT An average size chromomere of the polytene X chromosome of Drosophila melanogaster contains enough DNA in each haploid equivalent strand to code for 30 genes, each 1,000 nucleotides long. We have attempted to learn about the organization of chromosomes by asking how many functional units can be localized within a chromomere. This was done by 1) recovery of mutants representative of every cistron in the 3A2-3C2 region; 2) the characterization of the function of each mutant type and grouping by complementation tests; 3) the determination of the genetic and cytological position of each cistron by recombination and deletion mapping. The data clearly show one functional group per chromomere. It is postulated that a chromomere is one cistron within which much of the DNA is regulatory in function.

Synthesis, Characterization, and Antibacterial Evaluation of Curcumin-Sulfanilamide Compound

2020 ◽  
Vol 840 ◽  
pp. 265-269
Author(s):  
Nurjanah Nurjanah ◽  
Endang Saepudin
Keyword(s):  
Antibacterial Activity ◽  
Functional Group ◽  
Biological Activities ◽  
Curcuma Longa ◽  
Gram Negative Bacteria ◽  
Gram Negative ◽  
E Coli ◽  
Gram Positive Bacteria ◽  
Ftir Spectrophotometry

Curcumin, a diarylheptanoids compound which isolated primary from Curcuma longa, exhibits a variety of exciting biological activities, including as an antibacterial agent. In the present study, a sulfanilamide-contained curcumin compound was synthesized and characterized to investigate the antibacterial activity against gram-positive bacteria S. aureus, B. subtilis and gram-negative bacteria E. coli. The characterization of the synthesized compound was determined by analysing peak absorbance, functional group, and molecular weight using mass spectroscopy, UV/Vis and FTIR spectrophotometry. Curcumin-sulfanilamide compound exhibited the best antibacterial activity against gram-negative bacteria compared to curcumin and the curcumin-derived compound containing isoxazole with inhibitory zone of 11 mm.

Extraction and Functional Group Characterization of Fulvic Acid from Hami Lignite

2019 ◽  
Vol 4 (4) ◽  
pp. 1448-1455 ◽  
Author(s):  
Yingjie Zhang ◽  
Wenjing Liu ◽  
Xiaofeng Hu ◽  
Ao Zhang ◽  
Lulin Ma ◽  
...  
Keyword(s):  
Fulvic Acid ◽  
Functional Group

scholarly journals Influence of Oxidation Degree on the Physicochemical Properties of Oxidized Inulin

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1025
Author(s):  
Franklin Afinjuomo ◽  
Paris Fouladian ◽  
Thomas G. Barclay ◽  
Yunmei Song ◽  
Nikolai Petrovsky ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Functional Group ◽  
Spherical Shape ◽  
Differential Scanning Calorimetric ◽  
Gravimetric Analysis ◽  
Oxidation Degree ◽  
Peak Intensity ◽  
13C Nuclear Magnetic Resonance ◽  
Thermal Stability Of

This paper reports the oxidation of inulin using varying ratios of sodium periodate and the characterization of the inulin polyaldehyde. The physicochemical properties of the inulin polyaldehyde (oxidized inulin) were characterized using different techniques including 1D NMR spectroscopy, 13C Nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), differential scanning calorimetric (DSC), ultraviolet-visible spectroscopy (UV), and scanning electron microscopy (SEM). The aldehyde peak was not very visible in the FTIR, because the aldehyde functional group exists in a masked form (hemiacetal). The thermal stability of the oxidized inulin decreased with the increasing oxidation degree. The smooth spherical shape of raw inulin was destructed due to the oxidation, as confirmed by the SEM result. The 1HNMR results show some new peaks from 4.8 to 5.0 as well as around 5.63 ppm. However, no aldehyde peak was found around 9.7 ppm. This can be attributed to the hemiacetal. The reaction of oxidized inulin with tert-butyl carbazate produced a carbazone conjugate. There was clear evidence of decreased peak intensity for the proton belonging to the hemiacetal group. This clearly shows that not all of the hemiacetal group can be reverted by carbazate. In conclusion, this work provides vital information as regards changes in the physicochemical properties of the oxidized inulin, which has direct implications when considering the further utilization of this biomaterial.

Sign in / Sign up

Export Citation Format

Share Document