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Molecular structures of some low molecular weight model compounds with conformational features similar to those of high molecular weight compounds

1967; Wiley; Volume: 16; Issue: 5 Linguagem: Inglês

10.1002/polc.5070160541

1935-3065

P. Corradini, Paolo Ganis, Carlo Pedone, Augusto Sirigu, Piero Andrea Temussi,

Polymer Nanocomposites and Properties

Abstract An x‐ray study has been made of several alkylated dicarboxylic acids. The presence of atomic groupings similar to those in high molecular weight compounds has furnished interesting information about some structural features of high molecular weight compounds which cannot be directly established in the study of their structure. An interesting indication has been grasped about the non‐equivalence of the valence angles on CH 2  and on CH(CH 3 . On this basis, the internal rotation angles, which characterize the conformation of isotactic and syndiotactic polypropylene and of the alternating crystalline copolymer ethylene–butene‐2‐ cis , have been recalculated.