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434272

Sigma-Aldrich

Polyethylene

Ultra-high molecular weight, surface-modified, powder, 34-50 μm particle size

Synonym(s):

UHMWPE

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About This Item

Linear Formula:
H(CH2CH2)nH
CAS Number:
9002-88-4
MDL number:
MFCD00084423
UNSPSC Code:
12162002
PubChem Substance ID:
24867184
NACRES:
NA.23

Quality Level

100

form

powder

mol wt

(Ultra-high molecular weight)

particle size

34-50 μm

mp

144 °C

transition temp

Tm (DSC) 144 °C (at peak)

density

0.94 g/mL at 25 °C

SMILES string

C=C

InChI

1S/C2H4/c1-2/h1-2H2

InChI key

VGGSQFUCUMXWEO-UHFFFAOYSA-N

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Application

Additive to unsaturated polyesters, epoxides and other polymers to impart the unique properties of UHMWPE. Used in industrial parts, coatings and wear surfaces at 10-40 wt. %.

Features and Benefits

Polar surface groups assist chemical and physical bonding to matrix material. Contributes superior abrasion resistance, reduced coefficient of friction, enhanced tear strength and improved moisture resistance. Easier to process in particle form than molten UHMWPE.

Physical form

Particle surface is modified to contain acid and hydroxy groups.

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
MKCT3568
MKCT7492
MKCV4850
MKCR2798
MKCP5921

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Andrés Felipe Cruz-Pacheco et al.
Polymers, 12(5) (2020-05-23)
Polyaniline (PANI) has recently gained great attention due to its outstanding electrical properties and ease of processability; these characteristics make it ideal for the manufacturing of polymer blends. In this study, the processing and piezoresistive characterization of polymer composites resulting
Matteo Gumiero et al.
Food chemistry, 138(2-3), 1633-1640 (2013-02-16)
A high density polyethylene (HDPE)/calcium carbonate (CaCO(3)) film containing TiO(2) was prepared via blown film extrusion process. The photocatalytic properties of this film were evaluated by voltammetric, UV-Vis spectrophotometric and gas chromatographic measurements following the decomposition rate of suitably selected
Łukasz Krakowxzyk et al.
Medical science monitor basic research, 19, 210-213 (2013-08-22)
The search for new surgical flap techniques and modifications of already existing ones is gaining increasing popularity. Progress in flap designing and harvesting have improved the functional and aesthetic results, especially in head and neck reconstruction. Ten pigs were used
Katharine S Woods et al.
American journal of veterinary research, 74(4), 523-529 (2013-03-28)
To compare the diagnostic quality of bronchoalveolar lavage (BAL) fluid acquired from healthy dogs by manual aspiration via polyethylene tubing (MAPT) and via suction pump aspiration (SPA) with a suction trap connection. 12 healthy adult Beagles. BAL was performed with
Melody Yee-Man Wong et al.
Rapid communications in mass spectrometry : RCM, 27(6), 713-721 (2013-02-19)
Despite various porous materials having been widely adopted as spraying tips for direct sample analysis using electrospray ionization mass spectrometry (ESI-MS), the effect of surface property and porosity of spraying tip materials on their analytical performances is not clear. Investigation
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Questions

1–2 of 2 Questions  

  1. What is the surface modification of 434272 (Polyethylene, Ultra-high molecular weight)?

    1 answer

    1. The particle surface is modified to contain acid and hydroxy groups. This UHMWPE undergoes treatment with F2 in a process called fluoro oxidation, resulting in approximately 10-15 atom % F, 10-15 atom % O, and the rest being carbon on the surface. This modification allows for surface energies of up to 60 dynes/cm (typically 50 dynes/cm), making them easily dispersible in CASE (coatings, adhesives, sealants, and elastomers) formulations. Additionally, it imparts abrasion resistance, wear resistance, reduces the coefficient of friction, and increases mechanical strength.

      Furthermore, the amount of surfactants is negligible compared to polyethylene for this particle size. Assuming that carboxylic acids and hydroxyls form a layer approximately 1 nm thick (in reality probably even less), the volume of this layer relative to the volume of a 45 µm particle is estimated to be around 0.01%, resulting in a similar mass ratio.

      Helpful?

  2. Can you please specify, what is the modification type of surface-modified UHMWPE? Does this modification provide hydrophylicity to polymer surface? Do you have any hydrophylic UHMWPE powder available?

    1 answer

    1. The particle surface of this product has been modified to increase the hydrophilicity.
      To further discuss, we kindly ask you to navigate to the link https://www.sigmaaldrich.com/techservice, click on "Product Technical Inquires" under the Products Section with all the required information so that a member of our team can reach out to you to assist further. Thank you.

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