Effect of composition on the linear viscoelastic behavior and morphology of PMMA/PS and PMMA/PP blends

Calvão, Patrícia Schmid; Yee, Márcio; Demarquette, Nicole R.

doi:10.1016/j.polymer.2005.02.010

Cited by 51 publications

(49 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The interfacial tension is lower for the 70/30 blend than for the 90/10 blend. This has already been shown by Calvão et al [33] who found similar values (0.9 mN/m) for a 70/30 PMMA/PS blend.…”

Section: Interfacial Tensionsupporting

confidence: 86%

Compatibilization mechanism induced by organoclay in PMMA/PS blends

Genoyer

Yee

Soulestin

et al. 2017

Journal of Rheology

Self Cite

View full text Add to dashboard Cite

In this work, the effect of adding organoclay (Cloisite 20A) to a poly(methyl metacrylate) (PMMA)/polystyrene (PS) blend was evaluated in order to understand the compatibilization mechanism taking place. The blend morphology was quantified using micrographs obtained by scanning electron microscopy and observed by transmission electron microscopy. The state of dispersion of the clay was studied using small angle X-ray scattering and wide angle X-ray scattering and by applying the Carreau-Yasuda with a yield stress model to small amplitude oscillatory shear (SAOS) data. Morphological analyses revealed that the clay was intercalated, that its addition resulted in a decrease in the size of the dispersed phase and that it was preferentially located at the interface, except in the case of saturated interfaces, in which case the remaining clay was dispersed in PMMA. By applying the simplified Palierne model to SAOS experiments, the interfacial tension between the polymers forming the blend was inferred and shown to decrease upon addition of clay. The relaxation spectra inferred from the SAOS data, using the Honerkamp and Weese method, revealed four relaxation times: Relaxation of PMMA and PS chains, relaxation of the droplet shape, as well as an additional relaxation phenomenon attributed to the Marangoni stress. Although Marangoni stresses have already been studied in the case of blends compatibilized by block copolymers, this is the first time that it has been evidenced in the case of a clay as compatibilizer. V C 2017 The Society of Rheology. [http://dx

show abstract

Section: Interfacial Tensionsupporting

confidence: 86%

Compatibilization mechanism induced by organoclay in PMMA/PS blends

Genoyer

Yee

Soulestin

et al. 2017

Journal of Rheology

Self Cite

View full text Add to dashboard Cite

show abstract

“…Pode-se observar nas Figuras 7 e 8 que a morfologia obtida, com a adição de compatibilizante, é mais uniforme em relação à morfologia da amostra sem adição de P(S-co-MMA). Pelos resultados obtidos é possível observar que os valores dos raios volumétricos diminuem com a diminuição da concentração da mistura polimérica [8,11,51] e com o aumento da adição do compatibilizante [8-10, 12, 13] . Isto indica, provavelmente, que tanto o P(Sco-MMA) quanto o P(S-b-MMA) possuem características de agente emulsificador para a mistura polimérica de PMMA/PS, pois o tamanho da partícula dispersa é reduzido quando são adicionados os agentes compatibilizantes na mistura polimérica.…”

Section: Mma) E P(s-b-mma)unclassified

“…A presença deste tempo de relaxação é de difícil observação experimental, por ser muito longo e ocorrer em freqüências muito baixas, próximo do limite de resolução dos transdutores dos reômetros rotacionais [10] . Também, em alguns casos, este tempo de relaxação pode estar superposto ao tempo de relaxação da fase dispersa (τ F ), caso a concentração de agente compatibilizante for muito alta, por exemplo [46,51] .…”

Section: Generalidadesunclassified

“…As Figuras Esse comportamento pode ser atribuído a um processo de relaxação das gotas da menor fase quando essas são levemente deformadas [11,51,67] . Quando a concentração da fase dispersa aumenta, é esperado que o diâmetro das gotas aumente e o processo de relaxação torna-se mais lento, resultando em um aumento do módulo de armazenamento (G'(ω)) da mistura polimérica.…”

Section: Estudo Do Efeito Da Composiçãounclassified

“…Calvão et al [51] , que observaram que um aumento na concentração da menor fase em uma blenda resulta em um aumento do valor do módulo (G p ) e na largura do platô secundário.…”

Section: Estudo Do Efeito Da Composiçãounclassified

See 2 more Smart Citations

Estudo do comportamento reológico da mistura polimérica PMMA/PS compatibilizada ou não.

Yee¹

View full text Add to dashboard Cite

Polypropylene‐dispersed domain as potential nucleating agent in PS and PMMA solid‐state foaming

Sharudin

Abacha

Taki

et al. 2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

The potential of using dispersive domains in a polymer blend as a bubble nucleating agent was investigated by exploiting its high dispersibility in a matrix polymer in the molten state and its immiscibility in the solid state. In this experiments, polypropylene (PP) was used as the nucleating agent in polystyrene (PS) and poly(methyl methacrylate) (PMMA) foams at the weight fraction of 10, 20, and 30 wt %. PP creates highly dispersed domains in PS and PMMA matrices during the extrusion processing. The high diffusivity of the physical foaming agent, i.e., CO 2 in PP, and the high interfacial tension of PP with PS and PMMA could be beneficial for providing preferential bubble nucleation sites. The experimental results of the pressure quench solid-state foaming of PS/PP and PMMA/PP blends verified that the dispersed PP could successfully increase the cell density over 10 6 cells/cm 3 for PS/PP and 10 7 cells/cm 3 for PMMA/PP blend and reduce the cell size to 24 lm for PS/PP and 9 lm for PMMA/PP blends foams. The higher interfacial tension between PP and the matrix polymer created a unique cell morphology where dispersed PP particles were trapped inside cells in the foam.

show abstract

Effect of composition on the linear viscoelastic behavior and morphology of PMMA/PS and PMMA/PP blends

Cited by 51 publications

References 23 publications

Compatibilization mechanism induced by organoclay in PMMA/PS blends

Compatibilization mechanism induced by organoclay in PMMA/PS blends

Estudo do comportamento reológico da mistura polimérica PMMA/PS compatibilizada ou não.

Polypropylene‐dispersed domain as potential nucleating agent in PS and PMMA solid‐state foaming

Contact Info

Product

Resources

About