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Improving the Compatibility of Petroleum Resin

author£ºadmin Date£º2016/12/30 17:49:27

Compatibility usually refers to the polymer at the segment level or molecular level of compatibility, that is, two kinds of components at a certain temperature and the proportion of the ability to form a stable homogeneous system. Petroleum resin is a solid or viscous liquid polymer obtained by the separation and polymerization of C5, C9 and DCPD distillates from the by-product of ethylene plant. It is a lot of adhesives, such as hot melt adhesives, pressure sensitive adhesive essential adhesion components. Due to the lack of polar groups in its molecular structure, its adhesive properties and adhesion are poor. Its application in adhesives and coatings is limited, so it needs to be modified. Usually through graft copolymerization, has been synthesized in the petroleum resin molecular chain to introduce new functional groups, thereby improving the compatibility with other polymers, water-soluble and so on.

In heterogeneous systems, the interfacial area of ??the two phases (mainly the dispersibility), the thickness of the interfacial layer and the interfacial bonding strength are important factors in determining the properties of the blend. The factors that limit these factors are the compatibility of the polymers. When the two polymers are in contact with each other, they are first wetted at the interface, then the two-phase macromolecules are diffused by thermal motion, and the two polymers produce a distinct concentration gradient on both sides of the interface, The thickness of the interfacial layer depends mainly on the compatibility of the two polymers.

The important way to improve the compatibility of petroleum resin is to introduce the interaction group, so that it has complementary dissimilarity, that is, the structure of polymer 2 components is completely different, but their groups can have a strong interaction. If a polar group is introduced into the non-polar blending component, the compatibility may be significantly improved by ¡÷Hm<0. In the polymer chain can be introduced into the formation of hydrogen bonding or ionic groups, to strengthen the mutual attraction between components, but also can improve compatibility.