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Sigma-Aldrich

Polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene

mol wt 65-115 kDa by GPC, powder (Coarse)

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About This Item

Linear Formula:
[-CH2CH(C6H5)-]W(-CH2CH2-)x[-CH2CH(C2H5)-]y[-CH2CH(C6H5)-]Z
CAS Number:
66070-58-4
MDL number:
MFCD00134026
UNSPSC Code:
12162002
PubChem Substance ID:
24851971
NACRES:
NA.23
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form

powder (Coarse)

Quality Level

100

mol wt

65-115 kDa by GPC

contains

<1% antioxidant as inhibitor

viscosity

550 cP, 20 % in toluene, Brookfield(lit.)

density

0.91 g/mL at 25 °C (lit.)

SMILES string

C=C.C=CC=C.C=Cc1ccccc1

InChI

1S/C8H8.C4H6/c1-2-8-6-4-3-5-7-8;1-3-4-2/h2-7H,1H2;3-4H,1-2H2

InChI key

MTAZNLWOLGHBHU-UHFFFAOYSA-N

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General description

Polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene, also known as SEBS polymer, is used as a thermoplastic elastomer. It has good thermal and chemical stability with tunable mechanical properties.[1][2]

Application

SEBS can be used in the formation of an anion exchange membrane with an energy efficiency of ~ 86% for the fabrication of redox flow batteries.[2] It can also be used to form sulfonated membranes with high water permeability and thermomechanical stability for HVAC applications.[2] SEBS finds its usage as an ion exchange membrane with a capacity of ~1.91 mmol g-1 for fuel cells. [3]

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
MKCV3564
MKCS8282
MKCS4997
MKCQ4089
MKCL6218

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Macromolecular Symposia, 245(1), 450-456 (2006)
Soluble Polystyrene-b-poly (ethylenebutylene)-b-polystyrene Based Ionomer for Anion Exchange Membrane Fuel Cells Operating at 70? C
Gupta G, et al.
Fuel Cells, 18(2), 137-147 (2018)
Polystyrene-block-poly (ethylene-ran-butylene)-block-polystyrene triblock copolymer separators for a vanadium-cerium redox flow battery
Wang Z, et al.
Journal of the Electrochemical Society, 164(4), F372-F372 (2017)
Preparation, structure, and properties of styrene-ethylene-butylene-styrene block copolymerclay nanocomposites: Part II fracture behaviors
Lai SM, et al.
European Polymer Journal, 44(11), 3535-3547 (2008)

Questions

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  1. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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  2. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

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