Modern polyacetals

Masamoto, Junzo

doi:10.1016/0079-6700(93)90003-u

Cited by 61 publications

(34 citation statements)

References 119 publications

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“…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%

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

Pielichowska

2015

J Therm Anal Calorim

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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.

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Section: Introductionmentioning

confidence: 99%

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

Pielichowska

2015

J Therm Anal Calorim

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“…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

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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

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“…9(b) Anionic formaldehyde polymerization can also be subjected to controlled chain transfer with poly(ethylene oxide glycol), which produces block copolymers of polyoxymethylene with poly(ethylene oxide) terminal blocks. 10 Formaldehyde can also be polymerized in protic media, especially in methanol, to high molecular weight polymer. [11][12][13] Although this technique is intriguing, it has not been used commercially.…”

Section: Polyformaldehydementioning

confidence: 99%

Addition polymers of aldehydes

Vogl

2000

J. Polym. Sci. A Polym. Chem.

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Modern polyacetals

Cited by 61 publications

References 119 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

Polyoxymethylenes

Addition polymers of aldehydes

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