The Mechanism of Modifier Action in GR-S Polymerization. II<sup>1</sup>

Wall, Frederick T.; Banes, F. W.; Sands, Gillian

doi:10.1021/ja01212a008

Cited by 29 publications

(5 citation statements)

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“…Although the ester appears to limit chain length, its action is not solely that of a chain transfer agent. Table 1V shows that there are many more ester groups per molecule than to be expected if the linoleate ester functioned as a modifier of the mercaptan type studied by Snyder et al (15) and by Wall and co-workers (16). These investigators found an average of one modifier group per chain.…”

Section: Discussion Of Resultsmentioning

confidence: 86%

Polymerization of styrene with ethyl linoleate

Dyer

Maxwell

1949

J Americ Oil Chem Soc

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Summary The emulsion polymerization at 40°C. of mixtures of oxidized ethyl linoleate and styrene with potassium persulfate as catalyst yielded copolymers containing a maximum of one mole of ester per thirteen moles of styrene. A product of similar composition was obtained by bulk polymerization at 80°C. When the amount of ester in the monomer mixture was increased to 50 per cent in the emulsion polymerization, the ester content of the polymer was increased and the molecular weight and yield were decreased.

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Section: Discussion Of Resultsmentioning

confidence: 86%

Polymerization of styrene with ethyl linoleate

Dyer

Maxwell

1949

J Americ Oil Chem Soc

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“…contains one dodecyl mercaptan molecule ch eml~ally combined with it [10,11] . In other words, It IS assumed t hat the formul a for a polymer molecule can be written C1zH z5S (C4H 6)m(C8H g)nH , where m and n represent t he number of butadiene and styrene 11llits respectively, in the molecule.…”

Section: Calculation Of Heat Of Polymerizationmentioning

confidence: 99%

Heats of copolymerization of butadiene and styrene from measurements of heats of combustion

Nelson¹,

Jessup²,

Roberts³

1952

J. RES. NATL. BUR. STAN.

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The h eats of combustion of two sam ples of polybutadi ene and four cop olvm ers of butacli ene and styrene pr epared at 50° C (122° F ), and one sample of polybutadiene an d four copolym ers po lym eri ze d at 5° C (4 1 ° F ) were m eas ured in a bomb cal ori m eter. Th e stn ene contents in th e co polymers vari ed from approximate ly 8 to 55 weigh t percent.. A va lu e for t he heat of polymerization (or co polym eri zation) was calculated for each sample by comb ining th e exper im ent al valu e for t he h eat of combustion wi th other known t hermoch e.mical data. Th e m ean valu e obtai ned for th e h eat of polymerization (-tlI-J p 0) of polybutad lene IS 17.4 kcal per mono m er unit, and the values obtain ed for t he heat of copolym eri zation var ied fr om 17.1 to 17.7 kcal p er m onom er uni t . No app er ciab le differe nce was found betweep ti? e heats of copolym eri zation of t he 5° C and 50° C pol.vmers. Th e h eat of cop oly meri za t IOn can be repr ese n~ed a s a fun ction of styr ene conte nt of t he p olym er b.v a n equatIOn of a form den ved theor etICall y by Alfrey ancl Lewis, a lthough th e co ncli t ions und er whICh th e polym ers were form ed were su ch t hat som e of the as~u m pt i o n s und erl Yinp: t h e de ri vatio n of th e equation wer e not satisfi ed..

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“…The styrene content of the polymer increases with conversion until at 100% conversion the styrene content becomes 25% of the copolymer. The whole polymer, therefore, is quite heterogeneous with respect to monomer composition (76).…”

Section: Initiation and Modificationmentioning

confidence: 99%