Der polymere Formaldehyd, ein Modell der Zellulose

Staudinger, H.; Johner, H.; Signer, R.; Mie, G.; Hengstenberg, J.

doi:10.1515/zpch-1927-12628

Cited by 123 publications

(22 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Staudinger's study on crystalline polyoxymethylene and his polyoxymethylene single crystals by means of X-ray crystallography clearly proved that polyoxymethylene consists of longchain macromolecules although only four CH 2 O groups occupy the crystallographic unit cell. [58] In his study on the physical properties of polystyrene Staudinger recognized the influence of the degree of polymerization as well as the influence of diastereoisomerism (today we would call it stereoregularity). This happened quite a long time before G. Natta discovered the stereospecific polymerization and distinguished between atactic and isotactic polymers.…”

Section: Angewandte Chemiementioning

confidence: 99%

Hermann Staudinger and the Origin of Macromolecular Chemistry

Mülhaupt

2004

Angew Chem Int Ed

137

View full text Add to dashboard Cite

Staudinger's visions paved the way for the development of modern polymeric materials with very versatile properties and new opportunities at the interface of materials and life sciences. This is confirmed in this Essay, written to mark the 50th anniversary of the award of the Nobel Prize for Chemistry to Hermann Staudinger. His revolutionary concept, which initially attracted heavy opposition, marked the beginning of the new era of rational molecular design of structural and functional polymeric materials, whose property profiles are tailored by varying their molecular architectures.

show abstract

Section: Angewandte Chemiementioning

confidence: 99%

Hermann Staudinger and the Origin of Macromolecular Chemistry

Mülhaupt

2004

Angew Chem Int Ed

137

View full text Add to dashboard Cite

show abstract

“…[62] Poly(methylene) Mp a) Method of crystallization b) n LAM n total /n LAM Chain conformation ene) diacetates with DP ranging from 1 to 26 by Staudinger and his co-workers. [22][23][24] The starting poly(oxymethylene) was prepared by the reaction of paraformaldehyde and acetic anhydride in an autoclave at 180 8C and fractionation was performed using diethyl ether or ethyl acetate at different temperatures. Each fraction was subjected to chemical analysis and molecular weight measurements.…”

Section: Uniform Oligomers With Successive Dps For Understanding Reacmentioning

confidence: 99%

“…Isolation of uniform poly(oxymethylene) diacetates CH 3 CO(OCH 2 ) n OCOCH 3 by solvent fractionation. [23] Figure 15. Structure of the it-chloral oligomers from dimer to hexamer as indicated by single crystal X-ray analysis.…”

Section: Uniform Oligomers With Successive Dps For Understanding Reacmentioning

confidence: 99%

“…[21] Another Staudinger's attempt to obtain such a relationship between physical properties and molecular weights was the isolation and characterization of uniform poly(oxymethylene) diacetates with DP ranging from 1 to 22. [22][23][24] This challenging work demonstrates that a polymer comprises a mixture of homologous molecules with high molecular weights. To convince the chemists who were against him, Staudinger probably needed uniform polymer samples which could be used as pure substances on the same scientific basis that the most of chemists at that time were familiar with in the chemistry of low-molecular-weight compounds.…”

Section: Introduction and Definition Of Uniform Polymermentioning

confidence: 99%

See 1 more Smart Citation

Synthetic Uniform Polymers and Their Use for Understanding Fundamental Problems in Polymer Chemistry

Hatäda

Kitayama

Ute

et al. 2004

Macromol. Rapid Commun.

View full text Add to dashboard Cite

Summary: A uniform polymer is a polymer composed of molecules that are uniform with respect to molecular weight and constitution. Besides natural uniform polymers such as nucleic acids and polypeptide, synthetic uniform polymers have been obtained by a variety of approaches. In particular, a combination of living polymerization and supercritical fluid chromatography (SFC) separation is one of the promising ways for the preparation of uniform polymers. End‐functionalized uniform polymers enabled us to prepare uniform polymer architectures such as block, graft, comb, and star polymers. Their use for understanding the fundamental problems in polymer chemistry is discussed; topics include crystallization of polymers, chain conformation in solution, and association of stereoregular polymers in solution.

show abstract

“…ince the first description by Butlerow 1 in 1859 and intensive investigations on its properties by H. Staudinger and co-workers in the twenties of the last century, [2][3][4][5][6][7][8] polyoxymethylene (POM) has been developed as a technical thermoplastic material with a great variety of applications. POM is a semicrystalline thermoplastic material and is opaque white by nature.…”

mentioning

confidence: 99%

Effects of coloration on the physical and mechanical properties and on the thermal stability of polyoxymethylene

2006

View full text Add to dashboard Cite

ABSTRACT:The influence of coloring by using different batches on the crystallinity and the specific damage behavior of colored loudspeaker grills made from polyoxymethylene (POM) was studied. The investigations were performed by means of thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) under dynamic and isothermal conditions, pressure oxidative induction time studies (pOIt), melt volume rate (MVR), and perforation tests. The loudspeaker grills were made by injection molding and colored with 3 mass% master batch, added to the pellets during processing. The grills were tested after injection molding (as-received condition) and after accelerated ageing (oven storage up to 35 days at 140• C and UV irradiation). The results showed that the influence of the stabilizing system on the thermal and mechanical properties is stronger than the influence of the master batch substrate and the coloration. For the solely heat-stabilized material, coloration can reduce the susceptibility for UV irradiation but not as effectively as a UV stabilizer package.

show abstract

Der polymere Formaldehyd, ein Modell der Zellulose

Cited by 123 publications

References 0 publications

Hermann Staudinger and the Origin of Macromolecular Chemistry

Hermann Staudinger and the Origin of Macromolecular Chemistry

Synthetic Uniform Polymers and Their Use for Understanding Fundamental Problems in Polymer Chemistry

Effects of coloration on the physical and mechanical properties and on the thermal stability of polyoxymethylene

Contact Info

Product

Resources

About