Acyclic azoester modification of 1,4‐polybutadienes. II. Green strength and tack properties

Spiewak, J. W.; Bryant, Lonnee; Schulz, D. N.

doi:10.1002/app.1981.070261230

Cited by 5 publications

(1 citation statement)

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“…Because the plateau modulus is not strictly independent of frequency, a quantitative estimation of 44, the molecular weight between entanglements, cannot be made directly from the data of Figure 1. An estimate of the shear modulus due to the entanglement network, G,, can be obtained by assuming a uniform spacing of these couplings, for which a phenomenological theory predicts7s8 G,, = G R/0.207 (1) where G'k designates the maximum value of the loss modulus in the terminal region.…”

Section: Of Interfacial Contactmentioning

confidence: 99%

The mechanism for enhanced autoadhesion in azoester‐modified polybutadienes

Roland¹,

Böhm²

1984

J of Applied Polymer Sci

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The addition of IAD pendant groups to PB molecules results in a larger effective chain crosssectional area with consequent decrease in chain entanglements. This causes the rubber to be more complaint at low strains and strain rates. Simultaneously, the IAD structures give rise to polar and H‐bond interactions which cause the material to exhibit strong adhesion and to possess high green strength. As a result, the IAD‐PB is a relatively rare example of a synthetic polymer with good autoadhesive properties.

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Section: Of Interfacial Contactmentioning

confidence: 99%

The mechanism for enhanced autoadhesion in azoester‐modified polybutadienes

Roland¹,

Böhm²

1984

J of Applied Polymer Sci

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Synthesis and characterization of high molecular weight carboxylated polybutadiene

Gong

Wool

Friend

et al. 1999

J. Polym. Sci. A Polym. Chem.

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High molecular weight carboxylated polybutadienes (cPBDs) with number‐average molecular weight (Mn) from 98,000 to 200,000 and carboxylic acid (COOH) contents of 0.5–10 mol % were successfully synthesized through hydrocarboxylation of polybutadienes (PBDs) at temperatures of 140–150°C using PdCl2(PPh3)2 and SnCl2 · 2H2O catalysts. At low extents of hydrocarboxylation (COOH < 6 mol %), glass transition temperatures (Tg's) of the resulting cPBDs did not change considerably (<10°C). Significant chain scission and crosslinking was not detected during the chemical modification process. Characterization of the microstructures of cPBDs by FTIR, 13C‐NMR, and Raman spectroscopy showed that the carboxylic groups were incorporated on the pendant (1,2) PBD double bonds as well as the backbone (1,4) double bonds, indicating the hydrocarboxylation reaction did not solely occur at the terminal carbons of the pendant double bonds. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 3129–3138, 1999

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