Das Oligomerenproblem bei Polyesterfasern

Valk, Giselher; Stein, Gerd; Dugal, Sudhir

doi:10.1007/978-3-663-06798-6

Cited by 5 publications

(10 citation statements)

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“…[1] Considering the PET fibre, a distinction between the total oligomer content and the surface oligomer content is useful from a practical point of view. [1,5,6] An oligomer extraction with CH 2 Cl 2 similar to that used by Reinert et al [6] seemed the most suitable method for the investigations presented here. PET granules have been used in order to get oligomers of a high purity, not PET fibres finished with preparations.…”

Section: Resultsmentioning

confidence: 99%

“…However, the procedures from the older PET literature are restricted to the analysis of oligomers in organic liquids. [1][2][3][4][5][6] The methods which were described in the researches regarding the enzymatic hydrolysis of aliphatic polyesters (monitoring polyester film degradation gravimetrically or by UV spectroscopy in a cellular culture medium, [10] turbidity of agar plates mixed with polyester particles, [10] or titrating the carboxyl groups, which are released by polyester hydrolysis [12] ) are not suitable for the problems discussed here. Rather, the amount of oligomers (before and after reaction) both on the PET substrate and in the enzymatic liquids had to be determined.…”

Section: Methodsmentioning

confidence: 99%

“…Indeed, a changing state of the oligomers in the aqueous liquor was found, mainly due to the aggregation of small particles. [5,8] Thus, a method had to be developed to achieve conditions that are as close as possible to the state of freshly emerged oligomers relevant to the practical application. In order to achieve this, defined amounts of oligomer were dissolved in CH 2 Cl 2 and poured into the aqueous solution while being constantly stirred and (in contrast to the process of Hooker et al [19] ) the CH 2 Cl 2 was subsequently evaporated.…”

Section: The State Of the Oligomersmentioning

confidence: 99%

“…The latter phenomenon leads to the soiling of the dye apparatus and to a decrease of heat transmission at the heater elements. [1][2][3][4][5][6] Many proposals have been published in order to avoid the problems arising from formation of oligomers, [1,3,6,7] ; however, there have not been any suitable practical solutions. The permanence of the oligomer problem is confirmed by the fact that researchers all over the world would like to find a solution.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Contribution to the Investigation of Enzyme‐Catalysed Hydrolysis of Poly(ethylene terephthalate) Oligomers

Nechwatal

Blokesch

Nicolai

et al. 2006

Macro Materials & Eng

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Summary: One strategy to solve the problem of unwanted PET oligomer deposits in textile production is their enzymatic cleavage. In this work a selection of different enzymes (esterases, lipases) were tested for this purpose. The capacity to hydrolyse PET oligomers of some of the tested enzymes has been previously described in the literature. In order to imitate practical conditions both dry and precipitated PET oligomers were used. The decrease in the amount of cyclic trimer, the main component of the PET oligomers, was monitored by HPLC. After treatment with the lipase from Triticum aestivum a decrease of 80 wt.‐% was found. However, the effect of this lipase seems to have less to do with catalysing hydrolytic cleavages of ester groups than with the absorption of the oligomer on the enzyme protein.Cyclic PET trimer (cyclo‐tris[ethyleneglycolterephthalate]).magnified imageCyclic PET trimer (cyclo‐tris[ethyleneglycolterephthalate]).

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: The State Of the Oligomersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Contribution to the Investigation of Enzyme‐Catalysed Hydrolysis of Poly(ethylene terephthalate) Oligomers

Nechwatal

Blokesch

Nicolai

et al. 2006

Macro Materials & Eng

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“…The degree of hydrolysis depends on the concentration of the dye and the number of sulfonic acid groups per dye molecule [40].…”

Section: Properties Of Dyed Materialsmentioning

confidence: 99%

Textile Dyeing, 4. Dyeing of Man-Made Fibers

Flath¹,

Leube²,

Beckmann

2016

Ullmann's Encyclopedia of Industrial Chemistry

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Observation and analysis of the multicore performance impact on scientific applications

Simon

McGalliard²

2009

Concurrency and Computation

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SUMMARYWith the proliferation of large multicore high-performance computing systems, application performance is often negatively affected. This paper provides benchmark results for a representative workload from the Department of Defense High-performance Computing Modernization Program. The tests were run on a Cray XT-3 and XT-4, which use dual-and quad-core AMD Opteron microprocessors. We use a combination of synthetic kernel and application benchmarks to examine the cache performance, MPI task placement strategies and compiler optimizations. Our benchmarks show performance behavior similar to that reported in other studies and sites. Dual-and quad-core tests show a run-time performance penalty compared with single-core runs on the same systems. We attribute this performance degradation to a combination of L1 to main memory contention and task placement within the application.

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Das Oligomerenproblem bei Polyesterfasern

Cited by 5 publications

References 0 publications

A Contribution to the Investigation of Enzyme‐Catalysed Hydrolysis of Poly(ethylene terephthalate) Oligomers

A Contribution to the Investigation of Enzyme‐Catalysed Hydrolysis of Poly(ethylene terephthalate) Oligomers

Textile Dyeing, 4. Dyeing of Man-Made Fibers

Observation and analysis of the multicore performance impact on scientific applications

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