Analysenmethoden für die Verarbeitungshilfsmittel für die Plaste

Thinius, Kurt

doi:10.1007/978-3-642-45820-0_5

Cited by 11 publications

(15 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Early studies [137][138][139] revealed that when the electrical conductivity of samples is measured, the grain structure of PVC in the sample affects readings. It has a minimum at T=2E/3R; therefore, a sample of thickness of l cr would be affected by catalysis less than a sample of any other thickness, which does not offer stable conditions for measurement.…”

Section: Hydrogen Chloridementioning

confidence: 99%

Principles of Thermal Degradation

Wypych¹

2015

PVC Degradation and Stabilization

View full text Add to dashboard Cite

Section: Hydrogen Chloridementioning

confidence: 99%

Principles of Thermal Degradation

Wypych¹

2015

PVC Degradation and Stabilization

View full text Add to dashboard Cite

“…Also halogen-free comonomers also usually increase the rate of dehydrochlorination. Thus, Thinius and Schlimper (15) observed that the thermal stability of copolymers of vinyl chloride and vinyl acetate decreases with increasing content of vinyl acetate monomer units. In this case thermal instability is undoubtedly enhanced by the fact that vinyl acetate readily splits off acetic acid at elevated temperatures so that the polymer chains contain potentially more labile sites than does homo-PVC.…”

Section: Preventing Discoloration During Dehydrochlorinationmentioning

confidence: 96%

Internal Stabilization of Poly(vinyl chloride)

Braun¹

1968

Advances in Chemistry

View full text Add to dashboard Cite

The poor thermal stability of poly(vinyl chloride) requires processing in the presence of heat stabilizers. Numerous low molecular inorganic and organic compounds are suitable for this purpose. Another stabilization method, which has not yet been utilized, consists of copolymerizing vinyl chloride with comonomers to improve the stability of the resulting copolymers. Most halogen-free comonomers, such as diethyl fumarate or isobutylene, which prevent zipperlike dehydrochlorination, do not serve the purpose because the resulting copolymers are generally less stable than pure poly(vinyl chloride). However, metal salts of unsaturated carboxylic acids are suitable comonomers for enhancing the thermal stability of vinyl polymers. They have been used to determine the factors responsible for the improved heat stability of vinyl copolymers. Since these stabilizers are bonded into the polymer chain, it has been suggested that this method be called "internal stabilization," analogous to "internal plasticization." /Compared with other thermoplastics, poly (vinyl chloride) (PVC) is ^ relatively unstable against the action of light and heat. Even at temperatures as low as 100 °C. PVC splits off noticeable amounts of hydro gen chloride. This degradation accelerates with increasing temperature and is troublesome in processing PVC at the required elevated tempera tures because of the corroding action of the liberated hydrochloric acid; in practical applications of PVC as plastic the discoloration accompanying degradation is equally undesirable.Because of its thermal instability, commercial PVC requires the addition of stabilizing agents which retard as much as possible dehydro chlorination and thus also prevent discoloration during processing. There are many compounds which act as "stabilizers." The most effective are 65

show abstract

“…The oven test of sample color change under heat treatment only has industrial application. [26][27][28] Pressure measurement of gaseous products emitted by the sample is not used because of the interference of HCl's catalytic effect. [26][27][28] Pressure measurement of gaseous products emitted by the sample is not used because of the interference of HCl's catalytic effect.…”

Section: Kinetic Studies Of Dehydrochlorinationmentioning

confidence: 99%

Analytical Methods

Wypych¹

2015

PVC Degradation and Stabilization

View full text Add to dashboard Cite

Analysenmethoden für die Verarbeitungshilfsmittel für die Plaste

Cited by 11 publications

References 32 publications

Principles of Thermal Degradation

Principles of Thermal Degradation

Internal Stabilization of Poly(vinyl chloride)

Analytical Methods

Contact Info

Product

Resources

About