New Wholly-Aromatic Thermotropic Polyesters with Controlled Flexibility

1999 ◽  
Vol 559 ◽  
Author(s):  
Devdatt S. Nagvekar ◽  
Patrick T. Mather ◽  
Hong G. Jeon ◽  
Loon-Seng Tan
Keyword(s):  
Molecular Weight ◽  
Phase Behavior ◽  
Terephthalic Acid ◽  
Synthesis And Characterization ◽  
Quiescent Phase ◽  
Tosyl Chloride ◽  
Melt Spun ◽  
Spun Fibers

ABSTRACTIn this work, we present the synthesis and characterization of a new series of wholly-aromatic copolyesters derived from the condensation of various weight fractions of 4,4'-(o- phenylenedioxy)dibenzoic acid (OPDB) and substituted terephthalic acid (BTA) with 2-phenylhydroquinone (PHQ). The Higashi method, involving tosyl chloride and pyridine as solvent, was employed to yield polymer with significant molecular weight. These polymers are intended to enable accessible clearing transition and to control the balance of stiffness and toughness in melt-spun fibers systematically. We report the synthetic details along with characterization of quiescent phase behavior and morphology.

scholarly journals Synthesis and characterization of different soybean oil-based polyols with fatty alcohol and aromatic alcohol

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 491-499
Author(s):  
Fukai Yang ◽  
Hao Yu ◽  
Yuyuan Deng ◽  
Xinyu Xu
Keyword(s):  
Molecular Weight ◽  
Soybean Oil ◽  
Retention Time ◽  
Ring Opening ◽  
Isoamyl Alcohol ◽  
Synthesis And Characterization ◽  
Intermolecular Force ◽  
H Nmr ◽  
Epoxy Groups

Abstract In this article, five kinds of soybean oil-based polyols (polyol-E, polyol-P, polyol-I, polyol-B, and polyol-M) were prepared by ring-opening the epoxy groups in epoxidized soybean oil (ESO) with ethyl alcohol, 1-pentanol, isoamyl alcohol, p-tert-butylphenol, and 4-methoxyphenol in the presence of tetrafluoroboric acid as the catalyst. The SOPs were characterized by FTIR, 1H NMR, GPC, viscosity, and hydroxyl numbers. Compared with ESO, the retention time of SOPs is shortened, indicating that the molecular weight of SOPs is increased. The structure of different monomers can significantly affect the hydroxyl numbers of SOPs. Due to the large steric hindrance of isoamyl alcohol, p-hydroxyanisole, and p-tert-butylphenol, SOPs prepared by these three monomers often undergo further dehydration to ether reactions, which consumes the hydroxyl of polyols, thus forming dimers and multimers; therefore, the hydroxyl numbers are much lower than polyol-E and polyol-P. The viscosity of polyol-E and polyol-P is much lower than that of polyol-I, polyol-B, and polyol-M. A longer distance between the molecules and the smaller intermolecular force makes the SOPs dehydrate to ether again. This generates dimer or polymers and makes the viscosity of these SOPs larger, and the molecular weight greatly increases.

Synthesis and Characterization of Poly(Aryl Ether Quinoxaline)s with Controlled Molecular Weight

2011 ◽  
Vol 391-392 ◽  
pp. 826-829
Author(s):  
Song Ya Zhang ◽  
Zhong Xiao Li ◽  
Jia Ling Pu
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Strong Acid ◽  
Decomposition Temperature ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Aryl Ether ◽  
Good Solubility ◽  
Step Procedure

Novel poly(aryl ether quinoxaline)s (PEQs) were prepared via a two-step procedure. First, poly (ether benzil) (PEB) was synthesized by the polycondensation of 4,4’-difluorobenzil and 4,4’-isopropylidenediphenol.Then, PEB was reacted with 1,2-diaminobenzene and 4,4'-oxydibenzene-1,2-diamine to give the PEQs. The molecular weight of the PEQs could be adjusted easily by varying the molar ratio of 1,2-diaminobenzene to 4,4'-oxydibenzene-1,2-diamine. The PEQs exhibited good solubility in common organic solvents such as NMP, DMAc, DMF, cyclohexanone and chloroform. In addition, the PEQs also had high glass transition (Tg) temperatures and good thermal properties, with an initial thermal decomposition temperature above 475 oC and glass transition temperatures above 210 oC. They also exhibited excellent resistance to strong acid and alkali.

Synthesis and Characterization of Poly(terephthalic acid-2,5-furandicarboxylic acid-1,8-octanediol) Copolyester

2021 ◽  
Vol 36 (4) ◽  
pp. 557-561
Author(s):  
Zhengzai Cheng ◽  
Junpeng Cheng ◽  
Jun Chen ◽  
Jing Xiong ◽  
Xin Sun ◽  
...  
Keyword(s):  
Terephthalic Acid ◽  
Synthesis And Characterization ◽  
Furandicarboxylic Acid

scholarly journals Enzymatic Degradation of Melt-Spun Fibers from Poly(butylene succinate) Copolyesters with Terephthalic Acid.

2001 ◽  
Vol 57 (6) ◽  
pp. 178-183 ◽  
Author(s):  
Minoru Nagata ◽  
Hirokazu Goto ◽  
Wataru Sakai ◽  
Naoto Tsutsumi ◽  
Hideki Yamane
Keyword(s):  
Terephthalic Acid ◽  
Enzymatic Degradation ◽  
Butylene Succinate ◽  
Melt Spun ◽  
Spun Fibers

Synthesis and Characterization of Melt-Spun Metastable Al6Ge5

2015 ◽  
Vol 44 (3) ◽  
pp. 948-952 ◽  
Author(s):  
Masaya Kumagai ◽  
Ken Kurosaki ◽  
Noriyuki Uchida ◽  
Yuji Ohishi ◽  
Hiroaki Muta ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Melt Spun

Synthesis and characterization of low- and high-molecular-weight products based on 5-vinyl-2-norbornene

2019 ◽  
Author(s):  
Ekaterina S. Piskunova ◽  
Sergey V. Shorunov ◽  
Dmitry A. Alentiev ◽  
Maxim V. Bermeshev
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Synthesis And Characterization

ChemInform Abstract: Vitrigens. Part 1. Synthesis and Characterization of Low Molecular Weight Organic Glasses.

ChemInform ◽  
2010 ◽  
Vol 30 (20) ◽  
pp. no-no
Author(s):  
D. Braun ◽  
R. Langendorf
Keyword(s):  
Molecular Weight ◽  
Synthesis And Characterization ◽  
Low Molecular Weight ◽  
Organic Glasses

Chemistry of Alkoxo Complexes, Part III *Synthesis and Characterization of Some Mono(carboxylato)mono (alkoxo)nickel(II) Complexes

1979 ◽  
Vol 34 (3) ◽  
pp. 459-463 ◽  
Author(s):  
B. P. Baranwal ◽  
G. K. Parashar ◽  
R. C. Mehrotra
Keyword(s):  
Molecular Weight ◽  
Magnetic Susceptibility ◽  
General Formula ◽  
Synthesis And Characterization ◽  
Probable Structure ◽  
Equimolar Ratio ◽  
Elemental Analyses ◽  
Infra Red ◽  
Interchange Reactions

AbstractA number of mono(carboxylato)mono(alkoxo)nickel(II) complexes of the general formula, Ni(OR)(OOCR′), (with R′ = C13H27, C15H35 and C17H35) have been synthesized (where R = Me and Pri) by the reactions of nickel methoxide and isopropoxide with the respective carboxylic acids in equimolar ratio and (where R = Et and But) by alcohol interchange reactions. A study of the molecular weight, infra-red and electronic reflectance spectra and magnetic susceptibility in addition to elemental analyses has been carried out to throw some light on the probable structure of these derivatives.

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