Molecular weights of natural rubbers from selected temperate zone plants

摘要

AbstractMolecular weights and molecular weight distributions are compared by gel permeation chromatography for rubbers from 33 north temperate zone plants, guayule, and Hevea. Rubbers isolated from all the northern plants had much lower weight‐average molecular weight (Mw) values (9.72 × 104–4.95 × 105) than milled Hevea (1.31 × 106) or guayule (1.28 × 106) rubber.Pycnanthemum incanum,Lamiastrum galeobdolon,Monarda fistulosa, andVernonia fasciculataproduced potentially useful natural rubbers havingMwvalues above 4 × 105and polydispersity factors of