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Merck

8.18897

聚乙二醇

greener alternative

20000 (stabilised) for synthesis

别名:

聚（乙二醇）, PEG

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线性分子式:
H(OCH2CH2)nOH
化学文摘社编号:
25322-68-3
MDL號碼:
MFCD00081839
分類程式碼代碼:
13111021
酶委員會索引編號:
500-038-2
NACRES:
NA.22

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蒸汽壓力

<0.01 hPa ( 20 °C)

品質等級

200

形狀

flakes

自燃溫度

>320 °C

效力

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

環保替代產品特色

Safer Solvents and Auxiliaries
Learn more about the Principles of Green Chemistry.

sustainability

Greener Alternative Product

pH值

5-7 (20 °C, 100 g/L in H2O)

mp

58-63 °C

轉變溫度

flash point 240 °C

溶解度

500 g/L

密度

1.2 g/cm3 at 20 °C

體積密度

400‑500 kg/m3

環保替代類別

Aligned

儲存溫度

2-30°C

SMILES 字串

C(CO)O

InChI

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

InChI 密鑰

LYCAIKOWRPUZTN-UHFFFAOYSA-N

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一般說明

We are committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Green Chemistry. Polyethylene glycol (PEG) is an eco-friendly, biodegradable polymer widely used in pharmaceuticals and cosmetics. Its non-toxic nature and versatility make it a sustainable choice, derived from renewable resources, contributing to greener product formulations. Click here for more information.

應用

聚乙二醇20000(PEG-20000)可作为扩孔剂，用于通过水热法制备介孔La2O3催化剂。PEG 20000可改善La2O3催化剂颗粒的碱度、结晶度、比表面积和分散性。改性后的催化剂对于碳酸二甲酯和甘油的酯交换反应的催化性能更强。[1]
还可用作：
  • 表面活性剂，用于各种方法合成纳米材料，控制纳米结构的大小和形态。[2][3]
  • 载体，用于制备零价铁-PEG纳米复合材料(Fe/PEG)，用于去除水性溶液中的Pb(II)。[4]

分析報告

熔程（下限值）： ≥ 62 °C
熔程（上限值）： ≤ 66 °C
羟值：4 - 7
平均分子量：16000 - 28000

儲存類別代碼

10 - Combustible liquids

水污染物質分類（WGK）

WGK 1

閃點（°F）

281.5 °F - closed cup

閃點（°C）

138.6 °C - closed cup

分析证书(COA)

输入产品批号来搜索 分析证书(COA) 。批号可以在产品标签上"批“ （Lot或Batch）字后找到。

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Hydrothermal synthesis of hexagonal magnesium hydroxide nanoflakes
Wang Qiang, et al.
Materials Research Bulletin, 51, 35-39 (2014)
Monodisperse mesoporous La2O3 flakes for the synthesis of glycerol carbonate by efficiently catalyzing the transesterification of dimethyl carbonate with glycerol
Yue Chengguang, et al.
Reaction Kinetics, Mechanisms and Catalysis, 128(2), 763-778 (2019)
Polyethylene Glycol 20000-Supported Zero-Valent Iron Nanoparticle for Removal of Pb (II) from Aqueous Solutions: Characteristics, Kinetic and Thermodynamic Studies
He Qi, et al.
Science of Advanced Materials, 8(10), 1878-1886 (2016)
Microwave-assisted rapid synthesis of γ-cyclodextrin metal-organic frameworks for size control and efficient drug loading
Liu Botao, et al.
Crystal Growth & Design, 17(4), 1654-1660 (2017)

Questions

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  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/418/501/product-dating-information-06-25-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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