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Polypropylene is in many aspects similar to polyethylene, especially in solution behaviour and electrical properties.The methyl group improves mechanical properties and thermal resistance, although the chemical resistance decreases.II photo of, (1979) 52:1 18 Aldridge, Lee photo of, (1956) 29:1 19 Aldridge, Mary Jo photo of, (1940) 12:5 Front Cover Alesandri, Jeannette Mc Murray on Venice, (1933) 319320, 332335 Alexander, C.photo of, (1953) 25:7 22 Alexander, Connie photo of, (1950) 23:1 8 Alexander, Exel photos of, (1937) 9:9 238, (1937) 9:6 139 Alexander, Jewel Hodges photo of, (1950) 23:1 8 Alexander, Le Beryl photo of, (1950) 22:9 13 Alexander, Leeland, (2002) 23:1 411 (with photo) Alexander, Lindsay L., (1961) 33:7 18 (with photo) Alexander, Michael, (2003) 23:3 26 Alexander, Norman photo of, (1961) 23 Alexander, Olyen photo of, (1950) 23:1 8 Alexander, Perry photo of, (1948) 21:4 35 Alexander, Reuben D.Due to the tertiary carbon atom PP is chemically less resistant than PE (see Markovnikov rule).

Unlike polyethylene, crystalline and amorphous regions differ only slightly in their density.Non-oxidizing acids and bases can be stored in containers made of PP.At elevated temperature, PP can be dissolved in nonpolar solvents such as xylene, tetralin and decalin.Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar.Its properties are similar to polyethylene, but it is slightly harder and more heat resistant.

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