Polyoxymethylene

Kern, Werner; Cherdron, Harald; Jaacks, V.

doi:10.1002/ange.19610730602

Cited by 141 publications

(28 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Generally, for all POM samples, one broad peak for all degradation products can be observed, while for POM/HAp nanocomposites shape of peaks suggests two or . Additionally, the formic acid can be oxidized to water and carbon dioxide [8,37,38]. The limited amount of methanol (CH 3 OH) may be related to the acidolysis and hydrolysis [36].…”

Section: Resultsmentioning

confidence: 99%

“…The limited amount of methanol (CH 3 OH) may be related to the acidolysis and hydrolysis [36]. Peak m/z 44 could also correspond to carbonyl, carboxyl or hydroperoxide groups formed in the main chain during thermooxidative degradation [8,37,39] which can induce chain scission followed by the formation of formaldehyde, but they can also oxidize the latter to formic acid. The both reactions are responsible for acidolytic degradation of the polyacetal chain [5].…”

Section: Resultsmentioning

confidence: 99%

“…This is a result of lower carbon-carbon group interactions as these groups are separated in the macrochain. POM copolymer imparts superior resistance to alkali, hot water and other chemicals, longer life at elevated temperatures and more latitude in processing conditions [7], but its tensile strength, rigidity, softening and melting points are all lower than those found in POM homopolymer [8,9].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The influence of polyoxymethylene molar mass on the oxidative thermal degradation of its nanocomposites with hydroxyapatite

Pielichowska

2015

J Therm Anal Calorim

View full text Add to dashboard Cite

In this paper, the influence of mass-average molar mass (M w ) of polyoxymethylene (POM) copolymer on the thermooxidative degradation behavior of its nanocomposites with hydroxyapatite (HAp) is reported. POM copolymers' thermal stability slightly decreases with a decrease in mass-average molar mass. Thermal stability of POM/HAp nanocomposites is lower in comparison with pure POM, and it gets lower with a decrease in massaverage molar mass of POM copolymer. For POM copolymer with the highest molar mass, thermal stability of POM/HAp nanocomposite was ca. 30°C lower than for pure POM. To get a more in-depth insight into the decomposition process, kinetic analysis of POM/HAp nanocomposite thermal degradation process was performed using Friedman, Ozawa-Flynn-Wall and multiple nonlinear regression methods. The best fit for pristine T2, T3 and T4 copolymers with different molar mass of 100768, 74727 and 68377 g mol -1 , respectively, was obtained for onestage degradation mechanism with autocatalysis, while for T2/10 % HAp and T3/10 % it was parallel reaction model with autocatalysis (Bna) and phase-boundary reaction models (R3). For T4/10 % HAp, the best approximation was found for R2-Bna-D3 reaction model. From hyphenated TG-MS and TG-FTIR thermoanalytical studies, it was found that the main degradation product for POM/HAp nanocomposites is formaldehyde and the amount of other degradation products is lower in comparison with nonmodified POM copolymers.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The influence of polyoxymethylene molar mass on the oxidative thermal degradation of its nanocomposites with hydroxyapatite

Pielichowska

2015

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…From the formation of 3 we concluded that in the case of the BF 3 ·OEt 2 -promoted CROP, activation preferably occurs without co-initiator. BF 3 -promoted polymerisation of cyclic acetals without any co-initiator has been reported for polar solvents like nitrobenzene or dichloroethane [Higashimura et al 1965, Kern et al 1961, Kern and Jaacks 1960.…”

Section: H Nmr Spectroscopic Studies Of the Course Of Polymerisationmentioning

confidence: 99%

Mechanistic studies on cationic ring-opening polymerisation of cyclodextrin derivatives using various Lewis acids

Bösch¹,

Nimtz

Mischnick³

2006

Cellulose

View full text Add to dashboard Cite

“…A review of the historical development of polyoxymethylenes is given in [42][43][44]. Comprehensive summaries of the homopolymerization and copolymerization of trioxane can be found in [45][46][47].…”

Section: Polymerization Of Formaldehyde and Trioxanementioning

confidence: 99%

Polyoxymethylenes

Haubs¹,

Kurz²,

Sextro³

2012

Ullmann's Encyclopedia of Industrial Chemistry

View full text Add to dashboard Cite

The article contains sections titled: 1. Introduction 2. Physical and Chemical Properties 2.1. Morphology 2.2 Mechanical Properties 2.3. Thermal Properties 2.4. Chemical Stability 2.5. UV and Weather Resistance 2.6. Permeability 2.7. Fire Behavior 2.8. Optical Properties 2.9. Electrical Properties 3. Production 3.1. Polymerization of Formaldehyde and Trioxane 3.2. Homopolymers 3.3. Copolymers 3.3.1. Polymerization of Trioxane 3.3.1.1. Initiation 3.3.1.2. Chain Propagation 3.3.1.3. Chain Termination by Chain Transfer 3.4. Additives 3.4.1. Stabilizers 4.4.2. Nucleation Agents 3.4.3. Release Agents 3.5. Impact‐Resistant Types 3.6. Low VOC‐Grades 3.7. High Strength POM Copolymer 4. Economic Aspects 5. Quality Specifications and Analysis 6. Product Range and Processing 7. Uses 8. Recycling 9. Toxicology and Occupational Health

show abstract

Polyoxymethylene

Abstract: A. EinleitungSchon in der 1. Mitteilungls) iiber hochpolymere Verbindungen hat H. Staudinger**) die l i n e a r e K e t t e n s t ru k t u r

Cited by 141 publications

References 29 publications

The influence of polyoxymethylene molar mass on the oxidative thermal degradation of its nanocomposites with hydroxyapatite

The influence of polyoxymethylene molar mass on the oxidative thermal degradation of its nanocomposites with hydroxyapatite

Mechanistic studies on cationic ring-opening polymerisation of cyclodextrin derivatives using various Lewis acids

Polyoxymethylenes

Contact Info

Product

Resources

About