Aging Stability of Neoprene Latex. Relation Between Crosslinking and Hydrolysis of Allylic Chlorine

Andersen, D. E.; Kovacic, Peter

doi:10.1021/ie50541a051

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…Both p-dinitrosobenzene and 4,4'-methylenedi(phenylisocyanate) gave short-breaking, high-modulus vulcanizates (Table V). In a previous publication (2) it was concluded that during latex heat-aging, labile chlorine sites can undergo at least two types of reaction: substitution by hydroxyl groups and crosslink formation. Avidity of cure with a diisocyanate supports the proposal that hydroxyl groups are present in heat-treated neoprene latex polymer, as illustrated.…”

Section: C=chch2-n-mentioning

confidence: 99%

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Bisalkylation Theory of Neoprene Vulcanization

Kovacic¹

1955

Ind. Eng. Chem.

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Section: C=chch2-n-mentioning

confidence: 99%

“…The small amount of labile chlorine in neoprene is known (2) NO VULCANIZING AGENT PHENOL (1%) to be necessary for some types of vulcanization. Neoprene Type W usually is cured by an organic vulcanizing agent together with the oxides of zinc and magnesium.…”

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confidence: 99%

Bisalkylation Theory of Neoprene Vulcanization

Kovacic¹

1955

Ind. Eng. Chem.

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The structure of neoprene. VIII. Effect of polymerization temperature on polymer properties

Maynard

Mochel

1955

J. Polym. Sci.

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The chemical and physical properties of polychloroprenes made at temperatures ranging from −60 to +200°C. are discussed in the light of knowledge of structure gained from analysis of their crystallization behavior and infrared absorption spectra. The properties of polychloroprenes made below 0°C. are shown to be dominated by the preponderance of trans‐2‐chloro‐2‐butenylene units in their structure, e.g., they are highly crystalline and relatively unreactive. Polychloroprenes made at 10–90°C. show typical elastomeric properties and the chemical reactivity expected from the presence of a higher proportion of the allylic chloride units that result from 1,2‐polymerization. Polychloroprenes made at temperatures over 100°C. contain an even higher proportion of 1,2‐units and hence are unstable chemically. They are generally obtained as crosslinked gels. Chloroprene polymers made by ionic initiation are found to be chemically unstable, low molecular gums or resins. Their structure remains to be elucidated.

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Emulsion polymerization of chloroprene. II. Molecular weights

Morton

Piirma

1956

J. Polym. Sci.

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The molecular weights of emulsion polychloroprenes, prepared at four different temperatures in the presence and absence of a suitable mercaptan chain‐transfer agents, have been studied. The particular mercaptan used, a tertiary dodecyl type, was found to disappear at the relatively slow rate, which was first‐order up to high conversions. This permitted the preparation of polymer having a relatively uniform intrinsic viscosity up to high conversions. However, under certain conditions, the crosslinking reaction was found to give rise to the usual peaks in the viscosity–conversion curves. These curves differed from those of other dienes studied, in that the heights of the maxima depended not only on polymerization temperature but also on the mercaptan charge. This anomaly could be accounted for by the possibility of more than one mechanism of crosslinking. The above behavior made it impossible to obtain a quantitative measures of the crosslinking rate. However, observations of the postpolymerization changes experienced by this polymer lead to the conclusion that it has a high crosslinking rate.

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Aging Stability of Neoprene Latex. Relation Between Crosslinking and Hydrolysis of Allylic Chlorine

Cited by 6 publications

References 16 publications

Bisalkylation Theory of Neoprene Vulcanization

Bisalkylation Theory of Neoprene Vulcanization

The structure of neoprene. VIII. Effect of polymerization temperature on polymer properties

Emulsion polymerization of chloroprene. II. Molecular weights

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