Influence of molecular architecture on morphology and micromechanical behavior of styrene/butadiene block copolymer systems

Adhikari, Rameshwar; Michler, Goerg H.

doi:10.1016/j.progpolymsci.2004.06.002

Cited by 168 publications

(152 citation statements)

References 90 publications

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“…Block copolymers have received much academic and industrial attention since the early 1960's, due to low production costs and unique intrinsic properties. In recent times, focus has shifted towards nanotechnology applications, mainly due to the ability of these polymers to form self-assembled domains on the nanometre scale and the ease of which domain size/shape can be manipulated by altering the molecular weight or block concentration [10,11]. This allows for potential in a number of applications, including biomedical, membrane formation, electronics and information technology [12].…”

Section: Introductionmentioning

confidence: 99%

Novel elastomer dye-functionalised POSS nanocomposites: Enhanced colourimetric, thermomechanical and thermal properties

Spoljaric¹,

Shanks²

2012

Express Polym. Lett.

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Abstract. Nanocomposites consisting of poly(styrene-b-butadiene-b-styrene) (SBS) and polyhedral oligomeric silsesquioxanes (POSS) were prepared using a solvent dispersion method. POSS molecules were functionalised with two dichlorotriazine reactive dyes (CI Reactive Blue 4, CI Reactive Red 2) prior to compounding. Infrared spectroscopy confirmed functionalisation. Scanning electron microscopy revealed an increase in filler aggregation with concentration, with preferential phase selectivity. Ultraviolet spectroscopy and colourimetry confirmed colour uniformity and suggested that colour intensity could be controlled. Functionalised POSS improved thermal stability by imparting restrictions on SBS chain motions. Tensile stress-strain analysis revealed an increase in modulus with filler concentration, while creep deformation decreased and permanent strain increased with POSS content. Storage modulus, loss modulus and glass transition temperature increased with filler content due to effective SBS-POSS interaction. Nanocomposite properties were influenced by the phase the filler was dispersed throughout and the structure of the dye chromophore.

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Section: Introductionmentioning

confidence: 99%

Novel elastomer dye-functionalised POSS nanocomposites: Enhanced colourimetric, thermomechanical and thermal properties

Spoljaric¹,

Shanks²

2012

Express Polym. Lett.

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“…The observed kinks are typical features associated with orientational reorganization of lamellar structures. [45][46][47] Ⅲ. Mechanical homogenization.…”

Section: Resultsmentioning

confidence: 99%

“…Highly asymmetric hard-soft lamellae, with a high content (above 65%) of a hard component, are expected to manifest a promising balance between toughness and stiffness. [37][38][39][40][41][42][43] However, almost nothing has been achieved in this direction. In addition, the mechanics of lamellar structures is highly dependent on the molecular architecture.…”

Section: -32mentioning

confidence: 99%

Mechanics of an Asymmetric Hard–Soft Lamellar Nanomaterial

Shi¹,

Fredrickson²,

Krämer³

et al. 2016

ACS Nano

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Nano-layered lamellae are common structures in nanoscience and nanotechnology, but most are nearly symmetric in volume fraction. We report the structure and mechanics of thermodynamically stable and highly asymmetric soft-hard lamellar structures obtained with optimally designed PS 1 -(PI-b-PS 2 ) 3 miktoarm star block copolymers. The mechanical properties of these ductile PS based nanomaterials can be tuned over a broad range by varying the hard layer thickness and keeping the soft layer thickness fixed at 13 nm. The deformation of thin lamellae (< 100 nm) exhibited kinks, pre-damaged/damaged grains, as well as cavitation in soft nano-layers. In contrast, the deformation of thick lamellae (> 100 nm) manifests cavitation in both soft and hard nano-layers. In situ tensile-SAXS experiments revealed the evolution of cavities during deformation and confirmed that the damage in such systems reflects both plastic deformation by shear and residual cavities. Although this study was carried out in PS-PI hard-soft systems, the mechanism to obtain asymmetric layered structures should be general and the obtained mechanical properties provide guidance for future designs of nanostructured materials with promising mechanical properties.

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“…A redução do tamanho da fase dispersa dentro de certo limite é importante no resultado final, pois aumenta a área interfacial e melhora a transferência de tensões impostas ao sistema [24]. Verifica-se também, que a adição do compatibilizante promoveu uma maior adesão interfacial (setas vermelhas), e consequentemente elevando a resistência ao impacto das blendas, como pode ser verificado na Tabela 1.…”

Section: Microscopia Eletrônica De Varreduraunclassified

Comportamento Reológico, Mecânico, Termomecânico E Morfológico De Blendas De Poliestireno/Resíduo De Calçados Com Diferentes Granulometrias

Luna¹,

Silva²,

Araújo³

et al. 2017

Tecnologia Em Metalurgia Materiais E Mineração

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ResumoO objetivo deste trabalho foi produzir blendas poliméricas a partir de uma matriz de poliestireno (PS) com resíduos de borracha de calçados (SBRr), visando avaliar a influência da granulometria e o efeito do compatibilizante estireno-butadieno-estireno (SBS) nas propriedades reológicas, mecânicas (impacto e flexão), temperatura de deflexão térmica (HDT) e na morfologia. As blendas de poliestireno/resíduos de borracha foram preparadas em uma extrusora de rosca dupla corrotacional e, posteriormente, moldadas por injeção. A blenda PS/SBRr/SBS (40 mesh) teve um aumento de 254% na resistência ao impacto em relação ao poliestireno, bem como uma perda de apenas 10% no valor de sua rigidez sob flexão. Os valores da HDT das blendas diminuíram em relação à matriz de poliestireno. As curvas de reologia das blendas praticamente não apresentaram mudanças significativas. As fotomicrografias das blendas compatibilizadas evidenciaram uma morfologia característica de blendas imiscíveis. Considerando todas as dificuldades inerentes para reaproveitar os resíduos de borracha, os resultados evidenciam que é possível obter um material com boas propriedades, bem como reduzir custos no desenvolvimento de um novo material. Palavras-chave: Blendas poliméricas; Resíduos de borracha; Compatibilizante; Granulometria. RHEOLOGICAL, MECHANICAL, THERMOMECHANICAL AND MORPHOLOGICAL BEHAVIOR OF POLYSTYRENE/SHOES RESIDUE BLENDS WITH DIFFERENT GRANULOMETRY AbstractThe aim of this work was to produce polymer blends from a polystyrene (PS) matrix with shoes rubber waste (SBRr), to evaluate the influence of granulometry and the effect of styrene-butadiene-styrene (SBS) compatibilizer on rheological, mechanical (impact and flexion), heat deflection temperature (HDT) and morphology. The blends of polystyrene/rubber waste were prepared in a twin-screw co-rotational extruder and then injection moulded. The blend of PS/SBRr/SBS (40 mesh) had a 254% increase in impact strength in relation to polystyrene, as well as a loss of only 10% in its rigidity under flexion. The values of the HDT of the blend decreased compared to the polystyrene matrix. The rheology curves of the blends had no significant changes. The photomicrographs of compatibilized blends showed a characteristic morphology of immiscible polymer blends. Considering all the inherent difficulties to recycle rubber waste, the results show that it is possible to obtain a material with good properties and reduce costs in the development of a new material.

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Influence of molecular architecture on morphology and micromechanical behavior of styrene/butadiene block copolymer systems

Cited by 168 publications

References 90 publications

Novel elastomer dye-functionalised POSS nanocomposites: Enhanced colourimetric, thermomechanical and thermal properties

Novel elastomer dye-functionalised POSS nanocomposites: Enhanced colourimetric, thermomechanical and thermal properties

Mechanics of an Asymmetric Hard–Soft Lamellar Nanomaterial

Comportamento Reológico, Mecânico, Termomecânico E Morfológico De Blendas De Poliestireno/Resíduo De Calçados Com Diferentes Granulometrias

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