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Article: Temporary networks in polymer-modified asphalts.
- Article from:
- Polymer Engineering and Science
- Article date:
- December 1, 2004
- Author:
CopyrightCOPYRIGHT 2004 Society of Plastics Engineers, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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INTRODUCTION
Bitumens and asphalts are mixtures of aliphatic, aromatic and naphthenic hydrocarbons and small quantities of organic acids, bases and heterocyclic components containing nitrogen, oxygen, sulfur and some metal atoms (e.g., Fe, V, Ni). The chemical natures of various asphalt components are not readily definable; and therefore, four fractions are identified using selective solvents and chromatography: saturates, resins, aromatics and asphaltenes where the first three are usually grouped as maltenes. With respect to structure, asphalt is a substance with colloidal characteristics in which asphaltenes are covered by a stabilizing phase of polar resins ...