Ammonium Halide Type Thermotropic Liquid-Crystalline Polyethylenimines and Those Low-Mass Model Compounds

1990 ◽  
Vol 19 (6) ◽  
pp. 995-998 ◽  
Author(s):  
Seiji Ujiie ◽  
Kazuyoshi Iimura
Keyword(s):  
Liquid Crystalline ◽  
Model Compounds ◽  
Mass Model ◽  
Low Mass

scholarly journals Asymptotic-Giant-Branch Models at Very Low Metallicity

2009 ◽  
Vol 26 (3) ◽  
pp. 139-144 ◽  
Author(s):  
S. Cristallo ◽  
L. Piersanti ◽  
O. Straniero ◽  
R. Gallino ◽  
I. Domínguez ◽  
...  
Keyword(s):  
Metal Content ◽  
Asymptotic Giant Branch ◽  
Neutron Density ◽  
Surface Chemical ◽  
Mass Model ◽  
Surface Chemical Composition ◽  
Low Metallicity ◽  
Low Mass ◽  
Very High ◽  
High Neutron

AbstractIn this paper we present the evolution of a low-mass model (initial mass M = 1.5 M⊙) with a very low metal content (Z = 5 × 10−5, equivalent to [Fe/H] = –2.44). We find that, at the beginning of the Asymptotic Giant Branch (AGB) phase, protons are ingested from the envelope in the underlying convective shell generated by the first fully developed thermal pulse. This peculiar phase is followed by a deep third dredge-up episode, which carries to the surface the freshly synthesized 13C, 14N and 7Li. A standard thermally pulsing AGB (TP-AGB) evolution then follows. During the proton-ingestion phase, a very high neutron density is attained and the s process is efficiently activated. We therefore adopt a nuclear network of about 700 isotopes, linked by more than 1200 reactions, and we couple it with the physical evolution of the model. We discuss in detail the evolution of the surface chemical composition, starting from the proton ingestion up to the end of the TP-AGB phase.

scholarly journals Low-Mass Liquid Crystalline Materials Blended in Recycled Thermoplastic Polyester Elastomer for Corrosion Inhibitor Application

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3188
Author(s):  
Chun-Jui Chen ◽  
Bo-Wei Huang ◽  
Po-Jung Tseng ◽  
Zhi-Yu Yang ◽  
Xiang Huang ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Electrochemical Corrosion ◽  
Raw Material ◽  
Pet Waste ◽  
Crystalline Materials ◽  
Iron Plate ◽  
Anticorrosion Coatings ◽  
Adhesion Behavior ◽  
Low Mass ◽  
Liquid Crystalline Materials

In this work, the development and application of multicomponents obtained from recycled polyethylene terephthalate (r-PET) waste and monotropic liquid crystals as anticorrosion coatings are reported. The r-PET raw material was alcoholyzed and reproduced as a thermoplastic polyester elastomer (TPEE) with different amounts (n%, n = 0, 1, 3, and 5) of 1,6-hexanediamine (HDA). Then, a fluorine-containing liquid crystal (4-cyano-3-fluorophenyl 4-ethylbenzoate (4CFE)) was incorporated into the TPEE mixture via solvent blending to modify and enhance the water resistance. The adhesion behavior of the coating on glass and iron substrates was evaluated by cross-cut tests and immersion tests in aqueous NaCl. In the corrosion resistance measurements, all of the coating samples fabricated with 10 ± 1 mm thickness were less active toward electrochemical corrosion (PEF% > 99%) than the bare iron plate, indicating that our work provided better protection against corrosion of the iron plate.

Correlation of Model Compounds and Laterally Attached Side-Chain Liquid-Crystalline Polynorbornenes with an 11-Carbon Spacer

1998 ◽  
Vol 31 (6) ◽  
pp. 1779-1790 ◽  
Author(s):  
Coleen Pugh ◽  
Jun Shao ◽  
Jason J. Ge ◽  
Stephen Z. D. Cheng
Keyword(s):  
Liquid Crystalline ◽  
Side Chain ◽  
Model Compounds

Characterization of Low-Mass Model 3-Arm Stars Produced in Reversible Addition−Fragmentation Chain Transfer (RAFT) Process

2004 ◽  
Vol 37 (12) ◽  
pp. 4434-4440 ◽  
Author(s):  
Yungwan Kwak ◽  
Atsushi Goto ◽  
Koichi Komatsu ◽  
Yukio Sugiura ◽  
Takeshi Fukuda
Keyword(s):  
Chain Transfer ◽  
Mass Model ◽  
Reversible Addition ◽  
Low Mass
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