Characterization of polyvinyl chloride part I. Molecular weight determinations by gel permeation chromatography

1971 ◽  
Vol 11 (2) ◽  
pp. 152-159 ◽  
Author(s):  
R. K. S. Chan
Keyword(s):  
Molecular Weight ◽  
Polyvinyl Chloride ◽  
Gel Permeation Chromatography ◽  
Gel Permeation

scholarly journals Chromatographic characterization of products isolated from chrome shavings

1999 ◽  
Vol 42 (3) ◽  
pp. 281-290
Author(s):  
Edivaldo E Garcia ◽  
Cláudia C.M Kimura ◽  
Ariovaldo C Martins ◽  
Gisele O Rocha ◽  
Jorge Nozaki
Keyword(s):  
Amino Acids ◽  
Molecular Weight ◽  
High Performance Liquid Chromatography ◽  
High Performance ◽  
Chemical Characterization ◽  
Gel Permeation Chromatography ◽  
Gel Permeation ◽  
Chromatographic Characterization ◽  
Free Aminoacids

Gel permeation chromatography and high performance liquid chromatography were employed for separation and chemical characterization of products isolated from chrome shavings. After enzymatic hydrolysis, the products isolated were peptides of higher molecular weight. Peptides of lower molecular weight and free aminoacids were the main products using sulfuric acid in chrome shavings solubilization. Glycine (17%) , glutamic acid (10.6%) , alanine (9.2%) , and arginine (8.2%) were the principal amino acids found. Phenylalanine(1.8%) was the main aromatic amino acid , while tryptophane was completely absent.

Characterization of LARCTM-CPI 2 poly(amide acid) aging by gel permeation chromatography/differential viscometry

1995 ◽  
Vol 7 (1) ◽  
pp. 55-68 ◽  
Author(s):  
E J Siochi ◽  
S J Havens ◽  
P R Young ◽  
P M Hergenrother
Keyword(s):  
Molecular Weight ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Gel Permeation Chromatography ◽  
Concentrated Solutions ◽  
Solution Property ◽  
Molecular Weights ◽  
Gel Permeation ◽  
Property Changes

A controlled-molecular-weight LARCr'-CPI 2 poly(amide acid) was synthesized to investigate solution property changes that result from aging'Both dilute and concentrated solutions were aged at five temperatures and periodically analysed over a 33 d period. Various molecular weight parameters were obtained by gel permeation chromatography in combination with differential viscometry. Chemical changes were also followed by Fourier transform infrared spectroscopy. The temperatures used allowed the calculation of the energy of activation associated with changes in weight and number average molecular weights.

Upper Molecular Weight Limit for the Characterization of Polystyrene in Gel Permeation Chromatography

1974 ◽  
Vol 7 (3) ◽  
pp. 394-396 ◽  
Author(s):  
E. L. Slagowski ◽  
L. J. Fetters ◽  
Donald McIntyre
Keyword(s):  
Molecular Weight ◽  
Gel Permeation Chromatography ◽  
Gel Permeation

The Preparation and Characterization of Polycaprolactone Elastomer Polymer

2013 ◽  
Vol 641-642 ◽  
pp. 201-205
Author(s):  
Hong Su ◽  
Li Mei Guo ◽  
Lian Yong Wang
Keyword(s):  
Molecular Structure ◽  
Mechanical Property ◽  
Molecular Weight ◽  
Differential Scanning Calorimetry ◽  
Citric Acid ◽  
Gel Permeation Chromatography ◽  
Scanning Calorimetry ◽  
Elastomeric Material ◽  
Gel Permeation

polycaprolactone diols (MW=540, 1000, 2000) and citric acid were used as monomers, polycaprolactone-citric acid preformed polymer was preparated firstly by the heating polycondensation, then the preformed polymer was heated and cross-linked to obtain biodegradable elastomeric material. The molecular structure and Molecular weight was proved respectively by 1-HNMR and Gel Permeation Chromatography (GPC). The shape and glass transition temperature (Tg) of polycaprolactone-citric acid polymer was certified by differential scanning calorimetry(DSC). The hydrophilicity of the polymer was evaluated by its contact angle. The polymer’s mechanical property and degradation speed was also investigated.

Synthesis and Characterization of a Novel Biodegradable Polymer with Fluorescence Property

2011 ◽  
Vol 197-198 ◽  
pp. 21-26
Author(s):  
Ji Hang Li ◽  
Dong Jian Shi ◽  
Na Hu ◽  
Wei Fu Dong ◽  
Jun Feng Li ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Gel Permeation Chromatography ◽  
Ring Opening Polymerization ◽  
Fluorescence Property ◽  
H Nmr ◽  
Gel Permeation ◽  
Fluorescent Polymer ◽  
Poor Solvent

In this paper, a novel biodegradable and fluorescent polymer: fluorescein-polylactide (FL-PLA) was synthesized by FL and lactide in the method of ring-opening polymerization with the catalysis of Sn(Oct)2under 130°C . The structure and molecular weight of FL-PLA were characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (1H-NMR) spectroscopy, and gel permeation chromatography (GPC). The molecular weight of FL-PLA increased from 9.03×103to 21.24×103with decreasing the amount of FL and kept a narrow distribution. The result of differential scanning calorimeter (DSC) showed that Tgincreased from 52 to 72°C with increasing the molecular weight of polymer. Moreover, the average number content of FL in each molecular chain decreased from 0.96 to 0.81 with decrement of the amount of FL. Furthermore, FL-PLA showed the fluorescence property, and the fluorescence intensity could be controlled by the amount of FL. The FL-PLA nanoparticles were prepared by mixing the good and poor solvent, and the diameter was about 3 μm with regular spherical morphology.

Characterization of Ban Copolymers

1985 ◽  
Vol 58 (2) ◽  
pp. 295-303 ◽  
Author(s):  
H. K. Gupta ◽  
R. Salovey
Keyword(s):  
Molecular Weight ◽  
Refractive Index ◽  
Molar Mass ◽  
Gel Permeation Chromatography ◽  
Size Exclusion ◽  
Calorimetric Analysis ◽  
Ultraviolet Detection ◽  
Gel Permeation ◽  
Multiple Detection

Abstract Molar mass and compositional distributions in copolymers of butadiene and acrylonitrile have been analyzed by gel permeation chromatography with multiple detection. In some cases, a third component could not be separated by size-exclusion chromatography and was presumed to be an antioxidant attached to the copolymer chains. The amount of this antioxidant was measured by ultraviolet detection at 280 nm of chromatographic effluents and found to increase in amount with decreasing molar volume. Molar mass and compositional distributions were derived from corrected ultraviolet responses at 254 nm coupled with refractive index detection of BAN solutions separated by GPC. The variation of composition with molecular size depends on the composition of the monomer feed and, presumably, the conversion. For copolymers close the azeotropic composition (36% ACN), the composition was fairly uniform over the entire molecular weight distribution and showed a single Tg by differential scanning calorimetry. Some of the materials showed gel or insoluble fractions which had to be separated from the soluble moieties prior to GPC. Copolymers of composition slightly above azeotropic showed a single Tg but could be separated into sol and gel fractions which differed in composition. Infrared and calorimetric analysis showed that, in these cases, the gel was enriched in acrylonitrile. A sample containing 20% acrylonitrile showed marked deviations from compositional uniformity, and the high molecular weight components were enriched in butadiene. Infrared and calorimetric analysis of the sol and gel fractions showed that they were enriched in acrylonitrile and butadiene, respectively. In fact, the elastomer evidenced two glass transition temperatures. We suggest that gel permeation chromatography with multiple detection, specifically refractive index and ultraviolet absorption at 254 and at 280 nm, permits a fairly complete characterization of BAN elastomers. With computer analysis, a sophisticated raw material quality control is feasible and simple. We plan to reexamine our assumptions using laboratory synthesized BAN copolymers. Moreover, we hope to relate the physical properties of elastomers and rubber compounds with the molecular characterization of BAN copolymers. As an alternative to ultraviolet detection in GPC, it may be possible to get a more complete functional group analysis by infrared spectroscopy.

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