Influence of block molecular weight on the properties of styrene-ethylenebutylene-styrene block copolymers

Ghosh, S.; Bhowmick, Anil K.; Roychowdhury, Namita; Holden, G.

doi:10.1002/1097-4628(20000815)77:7<1621::aid-app24>3.0.co;2-u

Cited by 21 publications

(12 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In each of the cases, the midrubbery segment is a major component. The component block weights30 and overall molecular weights are listed in Table 1. It is apparent that the periodic spacing between the domains is a strong function of the constituting block lengths of the copolymer.…”

Section: Resultsmentioning

confidence: 99%

“…SEBS‐clay nanocomposites were prepared from two types of organically modified nanoclays: one commercially available Cloisite®20A (CL20) and another which was modified in our laboratory by cation exchange reaction between Na + cations of MMT and quaternary ammonium ion of the intercalant using octadecyl amine (OC)23, 30 as shown below in eq 1. After ambient drying, the clay was dispersed in ethanol and 4 pbw (% parts by weight, which effectively had ∼3% of silicate content) of dispersed clay was added to the stirring copolymer solution.…”

Section: Methodsmentioning

confidence: 99%

“…Although work on block copolymer by using AFM has been initiated,14–22 detailed AFM investigation of nanocomposites based on thermoplastic elastomer is still obscure. Our laboratory has extensively reported on the development and properties of rubber and/or plastics based nanocomposites and thermoplastic elastomers 23–30. The present investigation will highlight the structural aspects of neat block copolymeric‐SEBS having various block lengths, prepared under various experimental conditions, and of organically modified montmorillonite clay based nanocomposites.…”

Section: Introductionmentioning

confidence: 95%

See 2 more Smart Citations

Morphological mapping and analysis of poly[styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene] and its clay nanocomposites by atomic force microscopy

Ganguly¹,

Sarkar²,

Bhowmick³

2006

J Polym Sci B Polym Phys

Self Cite

View full text Add to dashboard Cite

Atomic force microscopy was successfully applied for comprehensive nanoscale surface and bulk morphological characterization of thermoplastic elastomeric triblock copolymers: poly[styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS) having different block lengths and their clay based nanocomposites. Commercially available Cloisite 1 20A and octadecyl (C 18 ) ammonium ion modified montmorillonite clay (OC) prepared in our laboratory by cation exchange reaction were used. The phase detected images in the tapping mode atomic force microscopy exhibited a well-ordered phase separated morphology consisting of bright nanophasic domains corresponding to hard component and darker domains corresponding to softer rubbery ethylene-cobutylene (PEB) lamella for all the neat triblock copolymers. This lamellar morphology gave a domain width of 19-23 nm for styrenic nanophase and 12-15 nm for ethyleneco-butylene phase of SEBS having end to mid block length ratio of 30:70 and block molecular weights of 8800-41,200-8800. On increasing the ratio of block lengths of the polymer matrix and the selectivity of the solvent toward the blocks used for casting, the morphological features of the resultant films altered along with change in domain thickness. The phase images showed position and distribution of the brightest clay stacks in the dark-bright contrast of the base matrix of the nanocomposite. Exfoliated and intercalated-exfoliated morphology obtained in the case of Cloisite 1 20A and OC-based SEBS nanocomposites, respectively, is further supported by X-ray diffraction and transmission electron microscopy studies. The lamellar thickness of the soft phases widened to 50-75 nm, where the layered clay silicates (40-54 nm in length and 4-17 nm in width) were embedded in the soft rubbery phases in the block copolymeric matrix of the nanocomposite. The marginally thicker width of the hard styrenic phases and slightly shrinked width of the soft rubbery lamella can be observed from the regions where no nanofiller is present. Distinct differences in bulk morphologies of the nanocomposites prepared in the melt and the solution processes were obtained with nanocomposites. The presence of clay particles was evident from the almost zero pull-off and snap-in force in the force-distance analysis of SEBS based nanocomposite. This analysis also revealed stronger tip interaction resulting in highest contact and adhesive forces with the softer PEB region relative to the harder PS region.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

Morphological mapping and analysis of poly[styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene] and its clay nanocomposites by atomic force microscopy

Ganguly¹,

Sarkar²,

Bhowmick³

2006

J Polym Sci B Polym Phys

Self Cite

View full text Add to dashboard Cite

show abstract

“…Stricker et al [24] found a glassy transition of SEBS‐MA phase in the iPP/GB/SEBS‐MA composites at −51°C. Glassy transitions of SEBS and SEBS‐MA phases in iPP matrix were reported to be at around −36.0 [33, 104] and −33.8°C [33], respectively, because of relaxation of soft EB midblocks of the elastomers. Tjong et al [33] found an increase in peak intensity of iPP with SEBS and SEBS‐MA elastomers.…”

Section: Resultsmentioning

confidence: 99%

Microstructural characteristics of glass bead‐ and wollastonite‐filled isotactic‐polypropylene composites modified with thermoplastic elastomers

Balkan

Demirer

2009

Polymer Composites

View full text Add to dashboard Cite

Microstructural characteristics of isotactic-polypropylene/glass bead (iPP/GB) and iPP/wollastonite (iPP/W) composites modified with thermoplastic elastomers, poly(styrene-b-ethylene-co-butylene-b-styrene) copolymer (SEBS) and corresponding block copolymer grafted with maleic anhydride (SEBS-g-MA), were investigated. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and dynamic mechanical analyses (DMA) showed that the iPP/SEBS and iPP/SEBS-g-MA blends were partially compatible two-phase systems. Well-dispersed spherical GB and acicular W particles without evidence of interfacial adhesion were observed in the iPP/GB and iPP/W binary composites respectively. Contrary to the blends, melt flow rates of the iPP/GB and PP/W composites decreased more with SEBS-g-MA than with SEBS because of enhanced interfacial adhesion with SEBSg-MA elastomer. The SEM analyses showed that the ternary composites containing SEBS exhibited separate dispersion of the rigid filler and elastomer particles (i.e., separate microstructure). However, SEBS-g-MA elastomer not only encapsulated the spherical GB and acicular W particles completely with strong interfacial adhesion (i.e., core-shell microstructure) but also dispersed separately throughout iPP matrix. In accordance with the SEM observations, the DSC and DMA revealed quantitatively that the rigid filler and SEBS particles in iPP matrix acted individually, whereas the rigid filler particles in the ternary composites containing SEBS-g-MA acted like elastomer particles because of the thick elastomer interlayer around the filler particles. The Fourier transform infrared analyses revealed an esterification reaction inducing the strong interfacial adhesion between the SEBS-g-MA phase and the filler particles. POLYM. COMPOS.FIG. 12. Storage modulus (E 0 ) and damping factor (tan d) variations of the ternary composites as a function of temperature.

show abstract

“…The b relaxation peak is appeared due to ethylene/butylene segments of SEBS-g-MA and a is due to PS blocks in SEBS-g-MA. 72 PA6/SEBS-g-MA blend shows two dynamic relaxation peaks at 239 and 42 C referred to as b and a relaxation peak of SEBS-g-MA and PA6, respectively. 73 The b relaxation peak of PA6/SEBS-g-MA blend increased with the nanotalc content, indicating restricted chain mobility due to phase interaction.…”

Section: Morphological Characterizationmentioning

confidence: 99%

Mechanical, morphological, and thermal properties of nanotalc reinforced PA6/SEBS‐g‐MA composites

Hemlata

Maiti

2014

J of Applied Polymer Sci

View full text Add to dashboard Cite

Ternary butylene‐styrene‐g‐maleic anhydride (SEBS‐g‐MA) (100/20 w/w) blend with varying content of nanotalc (1, 3, and 5 wt %) were prepared by melt compounding followed by injection molding. Thermal properties were investigated by thermogravimetric analysis (TGA) and the results show that the thermal properties of nanocomposites are slightly improved by the addition of nanotalc content. The morphology of nanocomposites using wide angle X‐ray diffraction (WAXD) and transmission electron microscopy (TEM) revealed the delamination of talc layers in the ternary nanocomposites. The dynamic mechanical properties of the samples were analyzed by using dynamic mechanical thermal analyzer (DMTA). The results show that the storage modulus of the blend monotonically increased while tan δ curve show the diffuse pattern with the nanotalc content. The mechanical properties of PA6/SEBS‐g‐MA nanocomposites were studied by tensile, flexural, and impact tests. The tensile and flexural properties continuously increased while izod impact and elongation‐at‐break decreased with nanotalc content. Various theoretical predictive models were used to correlate tensile modulus with the experimental data. The experimental data shows the positive deviation with the applied models. Bela Pukanszky model has been used to calculate the value of parameter B by employing tensile strength data. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41381.

show abstract

Influence of block molecular weight on the properties of styrene-ethylenebutylene-styrene block copolymers

Cited by 21 publications

References 14 publications

Morphological mapping and analysis of poly[styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene] and its clay nanocomposites by atomic force microscopy

Morphological mapping and analysis of poly[styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene] and its clay nanocomposites by atomic force microscopy

Microstructural characteristics of glass bead‐ and wollastonite‐filled isotactic‐polypropylene composites modified with thermoplastic elastomers

Mechanical, morphological, and thermal properties of nanotalc reinforced PA6/SEBS‐g‐MA composites

Contact Info

Product

Resources

About