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Merck

8.18897

Sigma-Aldrich

Polyethylenglykol

20000 (stabilised) for synthesis

Synonym(e):

Poly(ethylenglykol), PEG

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About This Item

Lineare Formel:
H(OCH2CH2)nOH
CAS-Nummer:
MDL-Nummer:
UNSPSC-Code:
13111021
EG-Index-Nummer:
500-038-2
NACRES:
NA.22
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Dampfdruck

<0.01 hPa ( 20 °C)

Qualitätsniveau

Form

flakes

Selbstzündungstemp.

>320 °C

Wirksamkeit

28000 mg/kg LD50, oral (Rat)
>20000 mg/kg LD50, skin (Rabbit)

pH-Wert

5-7 (20 °C, 100 g/L in H2O)

mp (Schmelzpunkt)

58-63 °C

Übergangstemp.

flash point 240 °C

Löslichkeit

500 g/L

Dichte

1.2 g/cm3 at 20 °C

Schüttdichte

400‑500 kg/m3

Lagertemp.

2-30°C

SMILES String

C(CO)O

InChI

1S/C2H6O2/c3-1-2-4/h3-4H,1-2H2

InChIKey

LYCAIKOWRPUZTN-UHFFFAOYSA-N

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Anwendung

Polyethylene glycol 20000 (PEG-20000) can be used as a pore-expanding agent to prepare mesoporous La2O3 catalyst via hydrothermal process. The effect of PEG 20000 on La2O3 catalyst particles, results in increased alkalinity, crystallinity, specific surface area, and dispersion. These modifications of the catalyst improve the catalytic performance in the transesterification of dimethyl carbonate with glycerol.[1]
It can also be used as:
  • A surfactant in the synthesis of nanomaterials by various methods to control the size and morphology of nanostructure.[2][3]
  • A support to prepare zero-valent iron-PEG nanocomposite material (Fe/PEG) applicable in the removal of Pb(II) from aqueous solutions.[4]

Hinweis zur Analyse

Schmelzbereich (unterer Wert): ≥ 62 °C
Schmelzbereich (oberer Wert): ≤ 66 °C
Hydroxylzahl: 4 - 7
Mittlere Molmasse: 16000 - 28000

Lagerklassenschlüssel

10 - Combustible liquids

WGK

WGK 1

Flammpunkt (°F)

281.5 °F - closed cup

Flammpunkt (°C)

138.6 °C - closed cup


Analysenzertifikate (COA)

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Questions

1–2 of 2 Questions  
  1. 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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  2. 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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