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2. 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 ]

3. Repeat unit - Wikipedia

   en.wikipedia.org/wiki/Repeat_unit

   Polystyrene has a chain where the substituent R is a phenyl group (C 6 H 5), corresponding to a benzene ring minus one hydrogen: -[CH 2-CH(C 6 H 5)] n-, so the repeat unit is -[CH 2-CH(C 6 H 5)]-. Condensation polymers: repeat unit and structural units

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 - Wikipedia

   en.wikipedia.org/wiki/Polyethylene

   Polyethylene was first synthesized by the German chemist Hans von Pechmann, who prepared it by accident in 1898 while investigating diazomethane. [12] [a] [13] [b] When his colleagues Eugen Bamberger and Friedrich Tschirner characterized the white, waxy substance that he had created, they recognized that it contained long −CH 2 − chains and termed it polymethylene.

6. Topological polymers - Wikipedia

   en.wikipedia.org/wiki/Topological_polymers

   Linear topology is a special topological structure that exclusively has two nodes as the termini without any junction nodes. High-density polyethylene (HDPE) could be regarded as a linear polymer chain with very small amount of branching, the linear topology has been listed below: [9] Linear chains capable of forming intra-chain interactions can fold into a wide range of circuit topologies.

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8. Branching (polymer chemistry) - Wikipedia

   en.wikipedia.org/wiki/Branching_(polymer_chemistry)

   In polymer chemistry, branching is the regular or irregular attachment of side chains to a polymer's backbone chain. It occurs by the replacement of a substituent (e.g. a hydrogen atom) on a monomer subunit by another covalently-bonded chain of that polymer; or, in the case of a graft copolymer, by a chain of another type.

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   World No. 2-ranked Alexander Zverev withdrew from the United Cup mixed teams tennis tournament on Wednesday with a biceps strain less than two weeks from the start of the Australian Open. The 27 ...