$\endgroup$ – Ivan Neretin Jun 29 '18 at 7:19 2 Repeating units Polymer molecules are very large compared with most other molecules , so the idea of a repeat unit is used when drawing a displayed formula. 58.0419 + Polypropylene glycol related (CH2CH2CH2O)n +58n. For polyethylene it is different. $\begingroup$ For all other polymers, the smallest repeating unit is the same as the molecule that was polymerized. Repeat units in polyethylene? 49.9968 + [CF2], perfluoro compounds +53n. 53.0032 + Ammonium chloride adducts (NH4Cl) +56n. The polymer is composed of repeating units as shown in the Figure 1. Solution for Given that the structural repeating units of polyethylene and poly(propylene) are respectively, draw the following structures: (i) Linear… Polyethylene terephthalate (PET) is a semi crystalline polymer possessing excellent chemical resistance, melt mobility and spinnability [2-4]. 56.0626 + [C4H8], Butyl repeating units +58n. [C3H6], propyl repeating chains +44n. It is denoted by PE. Almost all commercial polypropylenes are primarily isotactic, meaning that the methyl group is located in the same position on each repeating unit. Polyethylene is a common thermoplastic polymer material formed from ethylene monomers. Which one of the following is the chemical formula for the repeating unit in polyethylene: (a) CH2, (b) C2H4, (c) C3H6, (d) C5H8, or (e) C8H8? 44.0262 + Polyethylene glycol related (-CH2CH2O-)n, PEG +50n. The repeating unit of PE is (C 2 H 4) n with variable “n” values. Propyl repeating units, propylation 44.02622 [C2H4O] Polyethylene glycol, PEG (Tritons and Tween buffers) 49.99681 [CF2] From perfluoro compounds 53.00323 NH4Cl Ammonium chloride adducts (NH4Cl) salt adducts/clusters 56.06260 [C4H8] Butyl repeating units, butylation 57.95862 NaCl The molar mass of the repeating unit of polyethylene is 28 grams; the DSC thermogram showed a peak on the cooling side of the cycle at 120° C with a corresponding enthalpy of 25 kJ g-1 . 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