Effect of stoichiometric imbalances on the melt condensation polymerization of poly(dodecamethylene terephthalamide) studied by intrinsic viscosity and13C-NMR

2010 ◽  
pp. NA-NA ◽  
Author(s):  
Theodore Novitsky ◽  
Christopher Lange ◽  
William Jarrett ◽  
Lon Mathias ◽  
Scott Osborn ◽  
...  
Keyword(s):  
Intrinsic Viscosity ◽  
Condensation Polymerization ◽  
Melt Condensation

Novel Silicon-Containing NLO Polyesters for Electro-Optic Applications

1998 ◽  
Vol 18 (1-2) ◽  
pp. 31-48 ◽  
Author(s):  
Hwan Kyu Kim ◽  
Mi-Kyung Ryu ◽  
Suck-Hoon Shin ◽  
Soo-Min Lee ◽  
Su-Jin Kang
Keyword(s):  
Intrinsic Viscosity ◽  
Side Chain ◽  
Refractive Indices ◽  
Condensation Polymerization ◽  
Dsc Analysis ◽  
Polar Solvents ◽  
Electro Optic ◽  
Ft Ir ◽  
C Nmr

Abstract Novel silicon-containing nonlinear optical (NLO) polyesters were prepared by condensation polymerization as well as a new carbodiimide polycondensation of bis(4-chlorocarbonylphenyl)dimethylsilane (DCMS) with 4-(N, N′- bis(2-hydroxyethyl)amino-4′-nitrostilbene (DANS-diol). The NLO polyesters were obtained in relative yields with a high intrinsic viscosity of 0.60 dL/g. The intrinsic viscosity was increased by adding a small amount of a highly reactive diol (bisphenol-A). Molecular structural characterization of the resulting polymers was achieved by typical analytic methods, such as 1H- and 13C-NMR, FT-IR, and UV-vis spectroscopies. These silicon-containing side chain NLO polyesters were highly soluble in aprotic polar solvents, such as DMAc, DMF, NMP, γ-butyrolactone, etc. These polymers were found to be amorphous from DSC analysis. They exhibited a relatively higher Tg and thermal stability up to 220°C. The value of the electro-optic coefficient measured at the wavelength of 1.3 μm is in the range of 2 to 5.5 pm/V, and the refractive indices measured at the wavelength of 1.3 pm is in the range of 1.6213 to 1.6233.

Malleable and Sustainable Poly(ester amide) Networks Synthesized via Melt Condensation Polymerization

2019 ◽  
Vol 7 (18) ◽  
pp. 15147-15153 ◽  
Author(s):  
Jia-Hui Chen ◽  
Wen-Qiang Yuan ◽  
Yi-Dong Li ◽  
Yun-Xuan Weng ◽  
Jian-Bing Zeng
Keyword(s):  
Condensation Polymerization ◽  
Melt Condensation

Syntheses and Evaluation of Copolymer 6-Aminohexanoic Acid and 4R-Hydroxy-L-Proline for Bone Repair

2012 ◽  
Vol 562-564 ◽  
pp. 506-511
Author(s):  
Jia Chun Jiang ◽  
Zhi Tong Zhao ◽  
Guo Yu Lv ◽  
Yong Gang Yan ◽  
Deng Xue Wu
Keyword(s):  
Mechanical Properties ◽  
Weight Loss ◽  
Bone Repair ◽  
Bone Growth ◽  
Polymer Chains ◽  
Condensation Polymerization ◽  
Natural Bone ◽  
Infrared Spectrometer ◽  
Melt Condensation ◽  
Synthetic Copolymer

A novel synthetic copolymer (PAA) for bone repair was prepared by melt condensation polymerization with 6-aminohexanoic acid (He) and 4R-hydroxy-L-proline (Hyp). The structure and thermal property were characterized by infrared spectrometer (IR), nuclear magnetic resonance (H1NMR) and differential scanning calorimeter (DSC). The results indicated that the PAA had amide linkages in their polymer chains. The Tg of PAA was 57.56°C and significantly higher than that of nylon6, 50.46°C. Meanwhile, the intrinsic viscosity and mechanical properties were investigated at different He/Hyp ratios. It revealed that appropriate introduction of Hyp group could control the degree of polycondensation and adjusted mechanical properties of PAA obviously close to natural bone. The prepared polymers had about 2.12~18.21 % weight loss after 8-week soaking in PBS, showed degradable properties which was essentials to new bone growth. The copolymer of He and Hyp with ratios of 90/10 had 6.57 % weight loss and maintained the yield compressive strengths with about 67.51 MPa after 8 weeks, which exhibited a compatible mechanical properties and degradation speed for bone repair.

scholarly journals Polyester films obtained by noncatalyzed melt-condensation polymerization of aleuritic (9,10,16-trihydroxyhexadecanoic) acid in air

2014 ◽  
Vol 132 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
José Jesús Benítez ◽  
José Alejandro Heredia-Guerrero ◽  
Susana Guzmán-Puyol ◽  
Eva Domínguez ◽  
Antonio Heredia
Keyword(s):  
Condensation Polymerization ◽  
Melt Condensation

Synthesis of urea-formaldehyde resin by melt condensation polymerization

2008 ◽  
Vol 15 (6) ◽  
pp. 501-505 ◽  
Author(s):  
Ya-qing Liu ◽  
Yu Tian ◽  
Gui-zhe Zhao ◽  
You-yi Sun ◽  
Fu-tian Zhu ◽  
...  
Keyword(s):  
Urea Formaldehyde ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Condensation Polymerization ◽  
Melt Condensation

Bovine Platelet Proteins III. Some Properties of Platelet Fibrinogen

1969 ◽  
Vol 21 (03) ◽  
pp. 428-440 ◽  
Author(s):  
N. O Solum ◽  
S Łopaciuk
Keyword(s):  
Intrinsic Viscosity ◽  
Rabbit Antiserum ◽  
Disc Electrophoresis ◽  
Carbohydrate Content ◽  
Plasma Fibrinogen ◽  
Total Amino Acid ◽  
Electrophoretic Mobilities ◽  
Bovine Plasma ◽  
Starch Gel ◽  
The Difference

Summary1. Some properties of purified bovine platelet fibrinogen have been described and the data compared to those obtained by parallel analysis of purified bovine plasma fibrinogen.2. A close similarity was found between platelet and plasma fibrinogen as to sedimentation coefficients, electrophoretic mobilities in starch gel and polyacrylamide disc electrophoresis, light absorption spectra in the range 240 mμ to 330 mμ, ability to form immunoprecipitate with a rabbit antiserum against bovine plasma fibrinogen, total amino acid composition and in N-terminal amino acids.Differences between the fibrinogens were found as to intrinsic viscosity, carbohydrate content and behaviour upon clotting by thrombin. Intrinsic viscosity in 0.3 M NaCl at 25° was 0.48 dl/g for platelet fibrinogen as compared to 0.26 dl/g for plasma fibrinogen. The carbohydrate content of platelet fibrinogen was 0.56 ± 0.10% 1.56±0.10% and 1.37±0.09% for sialic acid (calculated as N-glycolyl neuraminic acid), hexose (galactose/mannose 1:2) and hexosamine (glucosamine), respectively. These values were 6, 54 and 26% higher than those found for plasma fibrinogen. The difference in clotting behaviour indicated a slower polymerization rate of the fibrin monomers formed from platelet fibrinogen than of those formed from plasma fibrinogen.

Application of pure, thermostable, alkali-tolerant xylanase in bleaching of oxygen-delignified pine kraft pulp

TAPPI Journal ◽  
2015 ◽  
Vol 14 (11) ◽  
pp. 689-694
Author(s):  
QINGZHI MA ◽  
QI WANG ◽  
CHU WANG ◽  
NIANJIE FENG ◽  
HUAMIN ZHAI
Keyword(s):  
Intrinsic Viscosity ◽  
Chlorine Dioxide ◽  
High Purity ◽  
Kraft Pulp ◽  
Alkaline Media ◽  
Industrial Scale ◽  
Elemental Chlorine ◽  
Effect Of Oxygen ◽  
Alkaline Tolerant ◽  
Ecf Bleaching

The effect of oxygen (O2)-delignified pine kraft pulp pretreatment by high-purity, thermostable, and alkaline-tolerant xylanases on elemental chlorine free (ECF) bleaching of O2-delignification kraft pulp was studied. The study found that xylanase pretreatment preserved the intrinsic viscosity and yield of O2-delignified pulp while causing about 7% of delignification with high delignification selectivity. The xylanases with high purity, higher thermostability (75°C~80°C) in highly alkaline media (pH 8.0~9.5) could be applied on an industrial scale. Pulp pretreatment by the high-purity, thermostable, and alkaline tolerant xylanases could improve pulp brightness or reduce the chlorine dioxide (ClO2) consumption. In a D0ED1D2 bleaching sequence using the same amount of ClO2, the xylanase-pretreated pulp obtained a higher brightness (88.2% vs. 89.7% ISO) at the enzyme dose of 2 U/g pulp; or for the same brightness as control (88.2% ISO), the ClO2 dosage in the D0 stage was reduced by 27%, which represents a 16% savings in total ClO2 used for bleaching.

Some Approaches to Viscometric Study of Chitosan in Acetic Acid Solution

2016 ◽  
Vol 10 (2) ◽  
pp. 135-139 ◽  
Author(s):  
Valentina Chernova ◽  
◽  
Angela Shurshina ◽  
Elena Kulish ◽  
Gennady Zaikov ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Acid Solution ◽  
Intrinsic Viscosity ◽  
Acetic Acid Solution ◽  
Conformational State ◽  
Macromolecular Coil ◽  
Degree Of Swelling ◽  
Current Value ◽  
Viscometric Study

Some ways of estimating the values of the intrinsic viscosity of chitosan were analyzed. It was shown that the method of Irzhak and Baranov for estimating the current value of the intrinsic viscosity allows to adequately estimates the conformational state of the macromolecular coil and its degree of swelling.

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