Chemical Structure and Physical Properties of Cyclic Olefin CopolymersPublication resulting from work carried out under the IUPAC Polymer Division Project 199-039-1-400; Task Group Members : S. C. Kim (Korea, project leader), T. Takigawa (Japan, project co-leader), D. J. Djikstra (Germany), J. He (China), B. Z. Jiang (China), D. S. Lee (Korea), C. Liu (China), T. Masuda (Japan), G. H. Michler (Germany), K. Nakayama (Japan), K. Nitta (Japan), J. Y. Park (Korea), J. Y. Shin (Korea), S. S. Woo (Korea).

2016 ◽  
Author(s):  
Ju Young Shin ◽  
Ji Yong Park ◽  
Chenyang Liu ◽  
Jiasong He ◽  
Sung Chul Kim
Keyword(s):  
Physical Properties ◽  
Chemical Structure ◽  
Task Group ◽  
Project Leader ◽  
Cyclic Olefin ◽  
Group Members

Effect of the number of arms on the mechanical properties of a star-shaped cyclic olefin copolymer

2019 ◽  
Vol 10 (41) ◽  
pp. 5578-5583 ◽  
Author(s):  
Takumitsu Kida ◽  
Ryo Tanaka ◽  
Koh-hei Nitta ◽  
Takeshi Shiono
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Physical Properties ◽  
Secondary Amine ◽  
Aggregation Number ◽  
Drastic Change ◽  
Cyclic Olefin Copolymer ◽  
Cyclic Olefin

The increase of aggregation number in a star-shaped cyclic olefin copolymer was succeeded by using a triazine-based secondary amine, which caused a drastic change in physical properties without changing the thermal properties.

Physical Properties and Chemical Structure of High-Amylose Corn Starch Fractions

1964 ◽  
Vol 16 (11) ◽  
pp. 345-351 ◽  
Author(s):  
Edna M. Montgomery ◽  
K. R. Sexson ◽  
R. J. Dimler ◽  
F. R. Senti
Keyword(s):  
Physical Properties ◽  
Chemical Structure ◽  
Corn Starch ◽  
High Amylose

scholarly journals Brazilian gutta-percha points. Part II: thermal properties

2007 ◽  
Vol 21 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Cláudio Maniglia-Ferreira ◽  
Eduardo Diogo Gurgel-Filho ◽  
João Batista Araújo Silva Jr ◽  
Regina Célia Monteiro de Paula ◽  
Judith Pessoa Andrade Feitosa ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Physical Properties ◽  
Ambient Temperature ◽  
Amorphous Phase ◽  
Thermal Behaviour ◽  
Chemical Structure ◽  
Scanning Calorimetry ◽  
Gutta Percha ◽  
Thermal Manipulation

This study was undertaken to explore the effect of heating on gutta-percha, analyzing the occurrence of endothermic peaks corresponding to the transformation that occurs in the crystalline structure of the polymer during thermal manipulation. This study also seeked to determine the temperature at which these peaks occur, causing a transformation from the beta- to the alpha-form, and from the alpha- to the amorphous phase. Eight nonstandardized gutta-percha points commercially available in Brazil (Konne, Tanari, Endopoint, Odous, Dentsply 0.04, Dentsply 0.06, Dentsply TP, Dentsply FM) and pure gutta-percha (control) were analysed using differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA). The transition temperatures were determined and analysed. With the exception of Dentsply 0.04 and Dentsply 0.06, the majority of the products showed thermal behaviour typical of beta-gutta-percha, with two endothermic peaks, exhibiting two crystalline transformations upon heating from ambient temperature to 130°. Upon cooling and reheating, few samples presented two endothermic peaks. It was concluded that heating dental gutta-percha to 130°C causes changes to its chemical structure which permanently alter its physical properties.

Oxidative Aging of Natural Rubber Vulcanizates. Part III. Crosslink Scission in Monosulfidic Networks

1969 ◽  
Vol 42 (3) ◽  
pp. 924-935 ◽  
Author(s):  
T. Colclough ◽  
J. I. Cunneen ◽  
G. M. C. Hrggins
Keyword(s):  
Natural Rubber ◽  
Physical Properties ◽  
Chemical Structure ◽  
Spectroscopic Methods ◽  
Chemical Probes ◽  
Conjugated Diene ◽  
Strain Measurements ◽  
Oxidative Aging ◽  
Tert Butyl Hydroperoxide ◽  
Natural Rubber Vulcanizates

Abstract A natural rubber vulcanizate containing almost entirely monosulfidic crosslinks was oxidized in oxygen and with tert-butyl hydroperoxide. The changes in physical properties due to oxidation were followed by stress—strain measurements, and the changes in chemical structure were investigated with chemical probes, and by spectroscopic methods. The results show that when the oxidized vulcanizates are heated at 75° C, the monosulfidic crosslinks are broken, that crosslinks containing two sulfur atoms are formed, and that conjugated diene and triene structures are introduced into the main polyisoprene chains.

scholarly journals Ionised gas structure of 100 kpc in an over-dense region of the galaxy group COSMOS-Gr30 at z ~ 0.7

2018 ◽  
Vol 609 ◽  
pp. A40 ◽  
Author(s):  
B. Epinat ◽  
T. Contini ◽  
H. Finley ◽  
L. A. Boogaard ◽  
A. Guérou ◽  
...  
Keyword(s):  
Physical Properties ◽  
High Velocity ◽  
Active Galactic Nucleus ◽  
Dense Region ◽  
Tidal Forces ◽  
Shock Models ◽  
The Galaxy ◽  
Group Members ◽  
Low Mass ◽  
Massive Galaxy

We report the discovery of a 104 kpc2 gaseous structure detected in [O ii]λλ3727, 3729 in an over-dense region of the COSMOS-Gr30 galaxy group at z ~ 0.725 with deep MUSE Guaranteed Time Observations. We estimate the total amount of diffuse ionised gas to be of the order of (~5 ± 3) × 1010 M⊙ and explore its physical properties to understand its origin and the source(s) of the ionisation. The MUSE data allow the identification of a dozen group members that are embedded in this structure through emission and absorption lines. We extracted spectra from small apertures defined for both the diffuse ionised gas and the galaxies. We investigated the kinematics and ionisation properties of the various galaxies and extended gas regions through line diagnostics (R23, O32, and [O iii]/Hβ) that are available within the MUSE wavelength range. We compared these diagnostics to photo-ionisation models and shock models. The structure is divided into two kinematically distinct sub-structures. The most extended sub-structure of ionised gas is likely rotating around a massive galaxy and displays filamentary patterns that link some galaxies. The second sub-structure links another massive galaxy that hosts an active galactic nucleus (AGN) to a low-mass galaxy, but it also extends orthogonally to the AGN host disc over ~ 35 kpc. This extent is likely ionised by the AGN itself. The location of small diffuse regions in the R23 vs. O32 diagram is compatible with photo-ionisation. However, the location of three of these regions in this diagram (low O32, high R23) can also be explained by shocks, which is supported by their high velocity dispersions. One edge-on galaxy shares the same properties and may be a source of shocks. Regardless of the hypothesis, the extended gas seems to be non-primordial. We favour a scenario where the gas has been extracted from galaxies by tidal forces and AGN triggered by interactions between at least the two sub-structures.

Sentiments as Status Processes? A Theoretical Reformulation from the Expectation States Tradition

2020 ◽  
Vol 38 (3) ◽  
pp. 217-235
Author(s):  
Alison J. Bianchi ◽  
Robert K. Shelly
Keyword(s):  
Social Inequality ◽  
Empirical Studies ◽  
Theoretical Framework ◽  
Task Group ◽  
Performance Expectations ◽  
Task Groups ◽  
Expectation States ◽  
Status Characteristics ◽  
Group Members ◽  
And Behavior

Do the ties that bind also create social inequality? Using an expectation states theoretical framework, we elaborate status characteristics and behavior-status theories to explore how sentiments, network connections based on liking and disliking, may affect processes entailing status, the prestige based on one’s differentially valued social distinctions. Within task groups, we theorize that positive and negative sentiments may themselves be status elements capable of evoking performance expectations within dyadic configurations typically modeled by expectation states theorists. Having a reputation for being liked or disliked “imported” into the group may enact status generalization. Alternatively, a status element based on sentiments may emerge during task group interaction as group members ascertain if alters are liked or disliked. Finally, we conclude by discussing how our theorizing motivates future theories and empirical studies.

scholarly journals Reformulated Zagreb Indices of Some Derived Graphs

Mathematics ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 366 ◽  
Author(s):  
Jia-Bao Liu ◽  
Bahadur Ali ◽  
Muhammad Aslam Malik ◽  
Hafiz Muhammad Afzal Siddiqui ◽  
Muhammad Imran
Keyword(s):  
Physical Properties ◽  
Chemical Structure ◽  
Topological Index ◽  
Chemical Reactivity ◽  
Line Graph ◽  
Total Graph ◽  
Zagreb Indices ◽  
Subdivision Graph ◽  
Chemical Constitution ◽  
Vertex Degrees

A topological index is a numeric quantity that is closely related to the chemical constitution to establish the correlation of its chemical structure with chemical reactivity or physical properties. Miličević reformulated the original Zagreb indices in 2004, replacing vertex degrees by edge degrees. In this paper, we established the expressions for the reformulated Zagreb indices of some derived graphs such as a complement, line graph, subdivision graph, edge-semitotal graph, vertex-semitotal graph, total graph, and paraline graph of a graph.

scholarly journals Effect of Ionizing Radiation on the Chemical Structure and the Physical Properties of Polycaprolactones of Different Molecular Weight

Polymers ◽  
2018 ◽  
Vol 10 (4) ◽  
pp. 397 ◽  
Author(s):  
Rodrigo Navarro ◽  
Guillermina Burillo ◽  
Esbaide Adem ◽  
Angel Marcos-Fernández
Keyword(s):  
Molecular Weight ◽  
Ionizing Radiation ◽  
Physical Properties ◽  
Chemical Structure ◽  
Different Molecular Weight
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