skip to main content
Idioma:
Primo Advanced Search
Primo Advanced Search Query Term
Primo Advanced Search Query Term
Primo Advanced Search Query Term
Primo Advanced Search prefilters
Busca Simples

Crazing and yielding in glassy polymers of high molecular weight

Razavi, Masoud ; Cheng, Shiwang ; Huang, Da ; Zhang, Shufan ; Wang, Shi-Qing

Polymer (Guilford), 2020-05, Vol.197, p.122445, Article 122445 [Periódico revisado por pares]

Kidlington: Elsevier Ltd

Texto completo disponível

Citações Citado por
  • Título:
    Crazing and yielding in glassy polymers of high molecular weight
  • Autor: Razavi, Masoud ; Cheng, Shiwang ; Huang, Da ; Zhang, Shufan ; Wang, Shi-Qing
  • Assuntos: Aging ; Bisphenol A ; Bisphenol A polycarbonate ; Brittle fracture ; Brittle-ductile transition ; Crazing ; Deformation ; Ductile-brittle transition ; Heterogeneity ; High temperature ; Molecular weight ; Polycarbonate ; Polylactic acid ; Polymer glasses ; Polymers ; Polymethyl methacrylate ; Polymethylmethacrylate ; Polystyrene ; Polystyrene resins ; Room temperature ; Tensile deformation ; Yielding
  • É parte de: Polymer (Guilford), 2020-05, Vol.197, p.122445, Article 122445
  • Descrição: This feature article presents many experimental results in order to explain and advance our understanding on crazing during tensile deformation of glassy polymers. Ample data are presented to show that crazing is an activated process and therefore takes time to emerge. For example, ductile polymers can also show crazing prior to yielding as demonstrated with bisphenol A polycarbonate and PMMA at elevated temperatures. As an integral part of the investigation, we show that crazing can emerge in absence of any ongoing deformation, i.e., taking place not during extension but after termination of the extension. More remarkably, glassy polymers such as polystyrene and amorphous poly(lactic acid) (PLA) can undergo macroscopic fracture without any ongoing extension after a rapid step extension that first results in massive crazing. Moreover, we investigate several ways to either suppress or promote craze formation. Specifically, it is shown that a craze-free ductile PLA turns brittle and develops crazing upon physical aging or the incorporation of “solvent”. Conversely, adequate pre-melt-stretching is found to prevent physical aging from causing crazing and brittle fracture. Crazing perhaps reveals the existence of structural and dynamic heterogeneity that can be more severe in one glassy polymer than another. For example, PMMA hardly shows crazing before brittle fracture at room temperature in contrast to PS. At the present, no theoretical description is available to predict which polymer is more prone to crazing since all glassy polymers of linear flexible chains show comparable characteristics in terms of the underlying chain network structure. [Display omitted] •The article describes nearly all aspects of crazing in tensile drawing of glassy polymers in terms of the latest chain-level understanding of yielding and brittle fracture behavior.•Crazing as an activated process involves localized failure of chain network and has been observed in ductile polymers as well as during stress relaxation of brittle polymers.•Pre-melt stretching is an effective method to turn brittle polymers ductile and delay the onset of crazing.
  • Editor: Kidlington: Elsevier Ltd
  • Idioma: Inglês
Voltar para lista de resultados
Ir para página anteriorAnterior Resultado  2 AvançarIr para próxima página

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.