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  2. Polyethylene - Wikipedia

    en.wikipedia.org/wiki/Polyethylene

    UHMWPE is polyethylene with a molecular weight numbering in the millions, usually between 3.5 and 7.5 million amu. [25] The high molecular weight makes it a very tough material, but results in less efficient packing of the chains into the crystal structure as evidenced by densities of less than high-density polyethylene (for example, 0.930–0. ...

  3. Ultra-high-molecular-weight polyethylene - Wikipedia

    en.wikipedia.org/wiki/Ultra-high-molecular...

    Ultra-high-molecular-weight polyethylene (UHMWPE, UHMW) is a subset of the thermoplastic polyethylene.Also known as high-modulus polyethylene (HMPE), it has extremely long chains, with a molecular mass usually between 3.5 and 7.5 million amu. [1]

  4. High-density polyethylene - Wikipedia

    en.wikipedia.org/wiki/High-density_polyethylene

    HDPE is known for its high strength-to-density ratio. [4] The density of HDPE ranges from 930 to 970 kg/m 3. [5] Although the density of HDPE is only marginally higher than that of low-density polyethylene, HDPE has little branching, giving it stronger intermolecular forces and tensile strength (38 MPa versus 21 MPa) than LDPE. [6]

  5. Polyethylene glycol - Wikipedia

    en.wikipedia.org/wiki/Polyethylene_glycol

    Polyethylene glycol (PEG; / ˌ p ɒ l i ˈ ɛ θ əl ˌ iː n ˈ ɡ l aɪ ˌ k ɒ l,-ˈ ɛ θ ɪ l-,-ˌ k ɔː l /) is a polyether compound derived from petroleum with many applications, from industrial manufacturing to medicine. PEG is also known as polyethylene oxide (PEO) or polyoxyethylene (POE), depending on its molecular weight.

  6. Degree of polymerization - Wikipedia

    en.wikipedia.org/wiki/Degree_of_polymerization

    The degree of polymerization, or DP, is the number of monomeric units in a macromolecule or polymer or oligomer molecule. [1] [2] [3]For a homopolymer, there is only one type of monomeric unit and the number-average degree of polymerization is given by ¯ ¯ = ¯, where ¯ is the number-average molecular weight and is the molecular weight of the monomer unit.

  7. Polyethylene terephthalate - Wikipedia

    en.wikipedia.org/wiki/Polyethylene_terephthalate

    Polyethylene terephthalate (or ... at least 90 percent of the mass of monomer reacted to ... will occur resulting in discoloration and reduced molecular weight, ...

  8. Polymer - Wikipedia

    en.wikipedia.org/wiki/Polymer

    One important example of the physical consequences of the molecular weight is the scaling of the viscosity (resistance to flow) in the melt. [33] The influence of the weight-average molecular weight on the melt viscosity depends on whether the polymer is above or below the onset of entanglements.

  9. Repeat unit - Wikipedia

    en.wikipedia.org/wiki/Repeat_unit

    The molecular mass of the repeat unit, M R, is simply the sum of the atomic masses of the atoms within the repeat unit. The molecular mass of the chain is just the product nM R . Other than monodisperse polymers, there is normally a molar mass distribution caused by chains of different length.