Synthesis and Characterization of NBR´s by RAFT Technique and their use as Rubber Precursor in ABS Type Resins

Authors

  • Francisco Javier Enríquez-Medrano Centro de Investigación en Química Aplicada
  • Florentino Soriano-Corral Centro de Investigación en Química Aplicada
  • Pablo Acuña-Vázquez Centro de Investigación en Química Aplicada
  • Edgar N. Cabrera-Álvarez Centro de Investigación en Química Aplicada
  • Hened Saade-Caballero Centro de Investigación en Química Aplicada
  • Adalí Castañeda-Facio Universidad Autónoma de Coahuila
  • Luis Valencia López Universidad Autónoma de Coahuila
  • Ramón Díaz de León-Gómez Centro de Investigación en Química Aplicada

DOI:

https://doi.org/10.29356/jmcs.v58i2.177

Abstract

Different rubbers based on polybutadiene were synthesized in solution by the reversible addition-fragmentation chain-transfer polymerization (RAFT) technique using 4-cyano-4-[(dodecylsulfanylthiocarbonyl)sulfanyl] entanoic acid as RAFT agent and 1,1’-azobiscyclohexanecarbonitrile (Vazo-88) as initiator. The results obtained in the polymerization of polybutadiene and poly(butadiene-co-acrylonitrile) (NBR) are discussed in terms of molecular weight distribution, composition and microstructure. Composition of polybutadiene in NBR´s was kept constant along the copolymerization, and the vinyl, cis and trans isomers are shown in values of around 12, 26 and 62% in all cases. Resulting rubbers were used to synthesize acrylonitrilebutadiene-styrene (ABS) type resins through an in situ bulk polymerization. Dynamic-mechanical properties and the morphology were analyzed in all the different ABS resins. In DMA analyses, the rubber component presented two transitions as well as an increase in the magnitude of the transition located around -75 °C, which is explained by the significant amount of SAN occlusions in the morphology, analyzed by TEM.

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Author Biographies

Adalí Castañeda-Facio, Universidad Autónoma de Coahuila

Facultad de Ciencias Químicas

Luis Valencia López, Universidad Autónoma de Coahuila

Facultad de Ciencias Químicas

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Published

2017-10-12

Issue

Section

Regular Articles

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