Infrared data showing the 1:1 relationship between ethyl and long branches in conventional polyethylene made by the free‐radical process

Tirpak, G. A.

doi:10.1002/pol.1966.110040206

J. Polym. Sci. B Polym. Lett.

1966

DOI: 10.1002/pol.1966.110040206

|View full text |Cite

Infrared data showing the 1:1 relationship between ethyl and long branches in conventional polyethylene made by the free‐radical process

G. A. Tirpak

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

1968

1981

Publication Types

Select...

Article5

Relationship

Self Cite0

Independent5

Authors

Journals

Cited by 7 publications

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen zur Kurzkettenverzweigung des Hochdruckpolyethylens

1979

View full text Add to dashboard Cite

Die Kurzkettenverzweigung von unter verschiedenen Bedingungen synthetisierten Hochdruckpolyethylenen wurde rnit Hilfe der y-Bestrahlung und nachfolgender gaschromatographischer Analyse der Spaltgase bestimmt. Es wurde experimentell belegt, daB Reaktionsdruck und Polymerisationstemperatur Art und Anzahl der Seitenzweige beeinflussen. Verzweigungsstruktur und Reaktionsparameter werden zueinander in Beziehung gesetzt und auf der Grundlage kinetischer Uberlegungen diskutiert.Ifayuenufi npoyeccoe paaeemsnenufi qennbcx aonetcya. X . Hccnedosanua tcopomtcoyennozo paaeemenenufi nonuamunena tmco~oeo daenenufi I I y T e M 0 6 n y s e~~x c y-nysam II Investigations on the branching of chain molecules. X . Investigations on short chain branchings of low density polyethyleneThe short chain branching in low density polyethylene obtained under various conditions were determined by y-irradiation followed by gaschromatography of the gaseous scission products. The pressure and temperature of polymerization were found to affect the kind and number of branchings. The branching structure and reaction parameters are related and discussed on a kinetic concept.

show abstract

Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen zur Kurzkettenverzweigung des Hochdruckpolyethylens

1979

View full text Add to dashboard Cite

show abstract

Copolymerization of ethylene with vinyl acetate. I. Effect of polymerization temperature on degree of branching

Wisotsky

Kober

Zlochower

1971

J of Applied Polymer Sci

View full text Add to dashboard Cite

SynopsisThe degree of branching of a series of ethylene-vinyl acetate copolymers was found to be strongly dependent upon polymerization temperature. The copolymers were prepared by free-radical polymerization and had low molecular weights and molar ratios of ethy1ene:vinyl acetate greater than 3: 1. Nuclear magnetic resonance and infrared studies showed that copolymers prepared a t 150°C were highly branched and had little crystallinity. Branches were mainly alkyl groups bn the polymethylene backbone segments. There was no evidence of 6-acetoxyalkyl branches. Long branches originating by intermolecular H abstraction from the acetylmethyl groups were also expected but could not be detected. These results were consistent with an intramolecular "backbiting" mechanism similar to that found in ethylene homopolymerizations. There was little or no participation by the vinyl acetate moiety in the branching scheme. Copolymers prepared a t about 90°C had very few long or short branches and were more crystalline. Copolymers prepared between these temperatures had intermediate degrees of branching and crystallinity.

show abstract

Mechanism of the short chain branching in low density polyethylene

Stoiljkovich¹,

Jovanovich

1981

Makromol. Chem.

View full text Add to dashboard Cite

In this paper the validity of the well-known Roedel's "back-biting" mechanism is questioned.It is shown that number and type of branches depend on the degree of order (entropy) of compressed ethylene molecules. A new mechanism for the short chain branching in low density polyethylene is proposed, based on the effect of the supermolecular species in compressed ethylene in this reaction. An equation for calculation of the number of branches for ethylene polymerization in a wide range of temperature ( -5 to + 200 "C) and pressure (40 to 7 OOO atm) is given. 0025-1 16X/8

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Infrared data showing the 1:1 relationship between ethyl and long branches in conventional polyethylene made by the free‐radical process

Cited by 7 publications

References 5 publications

Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen zur Kurzkettenverzweigung des Hochdruckpolyethylens

Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen zur Kurzkettenverzweigung des Hochdruckpolyethylens

Copolymerization of ethylene with vinyl acetate. I. Effect of polymerization temperature on degree of branching

Mechanism of the short chain branching in low density polyethylene

Contact Info

Product

Resources

About