Influence of Peripheral Groups on the Physical and Chemical Behavior of Cinchona Alkaloids

2009 ◽  
Vol 113 (34) ◽  
pp. 11696-11701 ◽  
Author(s):  
Jinfeng Lai ◽  
Zhen Ma ◽  
Larry Mink ◽  
Leonard J. Mueller ◽  
Francisco Zaera
Keyword(s):  
Cinchona Alkaloids ◽  
Chemical Behavior ◽  
Physical And Chemical

scholarly journals Hydrocarbons in Massive Star Forming Regions: C2H Observations

2015 ◽  
Vol 11 (S315) ◽  
Author(s):  
Xue-Jian Jiang ◽  
Yu Gao
Keyword(s):  
Massive Star ◽  
Chemical Behavior ◽  
Star Forming ◽  
Star Forming Regions ◽  
Chemical Models ◽  
Hydrocarbon Molecules ◽  
Chemical Conditions ◽  
Physical And Chemical

AbstractIn order to better understand the chemical conditions and evolutionary properties of massive star-forming regions, and to explore the physical and chemical behavior of simple hydrocarbon molecules, we have used telescopes such as CSO, JCMT, CARMA and SMA, to map the multi-transitions of C2H and HC3N. The column densities and abundances are compared with chemical models to gain some diagnostic of the environment of the regions.

Physical and Chemical Behavior of Four Cement-Treated Aggregates

2007 ◽  
Vol 19 (10) ◽  
pp. 891-897 ◽  
Author(s):  
K. A. Davis ◽  
L. S. Warr ◽  
S. E. Burns ◽  
E. J. Hoppe
Keyword(s):  
Chemical Behavior ◽  
Physical And Chemical

scholarly journals Biodegradable Polyamide 6.6 for Textile Application

2021 ◽  
Vol 11 (2) ◽  
pp. 100
Author(s):  
Maria Carolina Garcia Peixoto Sacchi ◽  
João Paulo Pereira Marcicano ◽  
Fernando Barros de Vasconcelos
Keyword(s):  
Standard Sample ◽  
Control Process ◽  
Chemical Properties ◽  
Synthetic Fiber ◽  
Statistical Control ◽  
Chemical Behavior ◽  
Physical Tests ◽  
Polyamide 6.6 ◽  
Physical And Chemical ◽  
And Chemical Properties

The study evaluates comparatively some physical and chemical properties of polyamide 6.6 standard and biodegradable. It also evaluates the period of biodegradation of the biodegradable yarn sample and standard sample. The physical properties analyzed were tensile strength, elongation, and tenacity. The chemical properties were related to the behavior of the samples in dyeing and the evaluation of subsequent strength dyeing. The evaluated samples were taken from knitwear produced with polyamide textured filament yarn 80 dtex f 68x1, standard and biodegradable, being purged, bleached, and dyed. The results of the physical tests, although statistically different, have values ​​very near the average, which in practice represent acceptable values ​​within the statistical control process. Both standard and biodegradable samples had the same chemical behavior and there is no difference. Concerning to biodegradation time under laboratory conditions, the carbon dioxide produced by the samples was monitored and measured to determine the percentage of biodegradation according to ASTM D 5511. After 735 days the percentage of biodegradation of the biodegradable yarn was 81.7% and of the normal yarn was 5.2%. This is an expressive gain in ecological terms for synthetic fiber.

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