Local Order and Dynamics of Nanoconstrained Ethylene-Butylene Chain Segments in SEBS

Mauri, Michele; Floudas, George; Simonutti, Roberto

doi:10.3390/polym10060655

Cited by 11 publications

(11 citation statements)

References 55 publications

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“…Figure 15b evidence also that LB1 possesses a higher order parameter than SEBS with high butylene content (HB1) for the mobile fraction and the existence of at least two zones with different dynamic order parameters, as obtained from MQ build-up analysis. The results were explained in terms of the presence of a so-called rotator mesophase [82]. Another kind of phase transition that can be studied is the crystallization process.…”

Section: Polymer Physicsmentioning

confidence: 99%

Time Domain NMR in Polymer Science: From the Laboratory to the Industry

2019

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Highly controlled polymers and nanostructures are increasingly translated from the lab to the industry. Together with the industrialization of complex systems from renewable sources, a paradigm change in the processing of plastics and rubbers is underway, requiring a new generation of analytical tools. Here, we present the recent developments in time domain NMR (TD-NMR), starting with an introduction of the methods. Several examples illustrate the new take on traditional issues like the measurement of crosslink density in vulcanized rubber or the monitoring of crystallization kinetics, as well as the unique information that can be extracted from multiphase, nanophase and composite materials. Generally, TD-NMR is capable of determining structural parameters that are in agreement with other techniques and with the final macroscopic properties of industrial interest, as well as reveal details on the local homogeneity that are difficult to obtain otherwise. Considering its moderate technical and space requirements of performing, TD-NMR is a good candidate for assisting product and process development in several applications throughout the rubber, plastics, composites and adhesives industry.

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Section: Polymer Physicsmentioning

confidence: 99%

Time Domain NMR in Polymer Science: From the Laboratory to the Industry

2019

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“…The soft ethylene‐butylene (EB) segment ensures the elastomer property for the low glass transition temperature ( T g ). [ 15 ] However, for the poor processability, research studies often compound SEBS with other polymers and oil to obtain materials with good mechanical properties and processability. [ 16 ] Polypropylene (PP), a semicrystalline polyolefin resin, combining good mechanical and thermal properties is widely applied in many industrial and life fields.…”

Section: Introductionmentioning

confidence: 99%

Effect of magnesium hydroxide as a multifunctional additive on high solar reflectance, thermal emissivity, and flame retardancy properties of PP/SEBS/oil composites

Sun

Zhang

2020

Polymer Composites

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Magnesium hydroxide (Mg(OH) 2) as a traditional environmentally friendly flame-retardant is widely used in polymer matrix to fabricate engineering materials. Cooling performance is important for engineering materials and can be characterized by solar reflectance and emissivity. However, solar reflectance and emissivity of Mg(OH) 2 are rarely reported. In this work, cooling properties of Mg(OH) 2 were investigated and the samples were prepared by blending a series weight ratios of Mg(OH) 2 with polymer elastomer matrix (styrene-ethylene-butylene-styrene copolymer [SEBS], polypropylene [PP], and processing oil). With the introduction of 150 phr Mg(OH) 2 , the solar reflectance enhanced to 47.23%, which is 31.19% higher than the polymer matrix. Simultaneously, the cooling effect of 15 C can be obtained in comparison with the polymer matrix and emissivity enhanced to 0.86. Meanwhile, an introduction of 150 phr Mg (OH) 2 increased the limit oxygen index from 17 to 26 and vertical burning test (UL-94) attained to V-0 rating. Thermal behaviors indicate that the composites exist multiple phase structure, where the glass transition temperature of SEBS is −55 C and melt temperature of PP is 153 C. The results show the composites can be used from −30 C to 80 C and satisfy the outdoor use conditions.

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“…However, no evidence has been found for potential low-temperature crystallization and melting in first-heating modulated differential scanning calorimetry (MDSC) thermograms (Figure a). Moreover, wide-angle X-ray diffraction (WAXD) measurements (Figure b and Table S2) on pristine, porous, and activated SEBS films exhibit broad diffuse scattering patterns centered at ∼20°, showing a short-range-ordered microstructure without any sign of crystallinity. , Moreover, full width at half-maximum (FWHM) remains unaffected by the polymer–gas-phase separation, dismissing any concerns for changes in the crystalline phase (Table S2). Small-angle X-ray scattering (SAXS) data on the same SEBS type has revealed the presence of cylindrical PS blocks associated with a nanoscale self-assembled hexagonal lattice structure. , Lorentz-corrected SAXS profiles (Figure c) on pristine, porous, and activated SEBS films imply similar short-range order for the cylindrical PS blocks irrespective of their state within the entire activation process.…”

Section: Resultsmentioning

confidence: 99%

Universal Strain Energy-Mediated Dynamic Porosity in Physically Networked Elastomers and Their Applications

Namdari

Rasel

Halim

et al. 2021

ACS Appl. Mater. Interfaces

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Mechanical and physical properties of porous polymers are highly dependent on the arrangement of their internal pores, which once synthesized are widely considered static. However, here we introduce an unconventional dynamic porosity strategy in physically networked elastomer polymers, irrespective of their chemistry. This strategy allows for an omnidirectional and reversible reconfiguration of porosity in response to applied mechanical deformations, even at ambient conditions. In particular, the normal contact pressure between human fingers (just 0.62 MPa) applied on thin elastomer films results in a permanent reversion of the pores to a denser and more solid state. The porous-to-solid transition leads to a 3 order of magnitude reduction in pore density and up to a 22% relative volumetric shrinkage of the films, resulting in an opaque-to-transparent transition (OTT) that acts as a visual indication of porosity state (porous vs nonporous). It is shown that the pore reversion pressure onset is dependent on the average pore-to-pore distance that is controllable through process-specific parameters. Furthermore, the porosity transition is reversible for multiple cycles when the through-plane compression activation is coupled with an in-plane stretch (ε = 700%). A strain energy-mediated thermodynamic model is successfully implemented to confirm the effects of mechanical deformations on pore reversion and generation. Finally, applications of the newfound dynamic porosity concept are exploited for pressure indication, on-demand modulation of materials' mechanical and thermal characteristics, and flexible photomasks.

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Local Order and Dynamics of Nanoconstrained Ethylene-Butylene Chain Segments in SEBS

Cited by 11 publications

References 55 publications

Time Domain NMR in Polymer Science: From the Laboratory to the Industry

Time Domain NMR in Polymer Science: From the Laboratory to the Industry

Effect of magnesium hydroxide as a multifunctional additive on high solar reflectance, thermal emissivity, and flame retardancy properties of PP/SEBS/oil composites

Universal Strain Energy-Mediated Dynamic Porosity in Physically Networked Elastomers and Their Applications

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