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Journal of Elastomers and Plastics
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Structure and Properties of Model Polybutadienes - Effect of Microstructure on the Dynamic Mechanical Properties of Rubber

Marvin R. Rivera

Departamento de Ingeniería Química, Laboratorio de Polímeros L-213, Facultad de Química, Universidad Nacional Autónoma de México, C.P. 04510 México D.F., México

Rafael Herrera Nájera

Departamento de Ingeniería Química, Laboratorio de Polímeros L-213, Facultad de Química, Universidad Nacional Autónoma de México, C.P. 04510 México D.F., México, rherrern{at}servidor.unam.mx

Juan José Benvenuta Tapia

Departamento de Ingeniería Química, Laboratorio de Polímeros L-213, Facultad de Química, Universidad Nacional Autónoma de México, C.P. 04510 México D.F., México

Leonardo Ríos Guerrero

Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, C.P. 07730 México D.F., México

A series of controlled microstructure polybutadiene rubbers (PBs) was synthesized via anionic polymerization. Their structure and proper ties are analyzed by means of GPC, 13C NMR, DSC, and DMA, and compared to the behavior of some commercial high cis rubbers. Thermal analyses results indicate the presence of crystalline domains of different nature in PBs with high cis-1,4 and high trans-1,4 isomers content, while rubbers with high content of vinyl-1,2 units do not show evidence of crystals. A shift in Tg to higher temperatures as vinyl content increases is observed; an expression was found for predicting Tg of rubber from microstructure data.

Key Words: DMA • DSC • polybutadienes • microstructure

Journal of Elastomers and Plastics, Vol. 37, No. 3, 267-278 (2005)
DOI: 10.1177/0095244305051505
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