Trigonal delta form as a tool for tuning mechanical behavior in poly(propylene-co-1-pentene-co-1-heptene) terpolymers Articles uri icon

authors

  • GARCIA PEÑAS, ALBERTO
  • GÓMEZ ELVIRA, JOSÉ MANUEL
  • BARRANCO GARCÍA, ROSA
  • PÉREZ, ERNESTO
  • CERRADA, MARÍA LUISA

publication date

  • September 2016

start page

  • 112

end page

  • 121

volume

  • 99

International Standard Serial Number (ISSN)

  • 0032-3861

Electronic International Standard Serial Number (EISSN)

  • 1873-2291

abstract

  • Terpolymers based on propylene with 1-pentene and 1-heptene as comonomeric units are satisfactorily synthesized containing distinct overall compositions in comonomers as well as three different 1-pentene/1-heptene ratios at a given global composition. The effect of total content in counits and ratio between comonomers on polymerization activity, intrinsic viscosity, molecular weights and microstructural details has been analyzed. In addition, their influence on the mechanical response has been preliminary checked. The results show that rigidity related parameters, like Young's modulus and yield stress, are mainly dependent on overall composition, but comonomer ratio becomes also a primary variable for the terpolymers with a global counit content higher than 10 mol %. This fact is ascribed to the capability or inability of developing the trigonal polymorph as function of which counit (1-pentene or 1-heptene) is in majority or minority.

keywords

  • terpolymer synthesis; trigonal form; mesomorphic entities; young's modulus