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Study on Infrared Spectra of Petroleum Resin

author£ºadmin Date£º2017/2/14 17:23:12
In the FT-IR spectrum, there are three evidences that the presence of olefins double bonds in the C-9 petroleum resin is at 1604 cm-1, which is the characteristic absorption peak of the benzene ring double bond in the molecular chain of petroleum resin, 3040 cm-1 of the shoulder is unsaturated CH (non-benzene ring) stretching vibration of the characteristic absorption peak, can be used as a double bond of unsaturated olefins. And the sharp peak at 699 cm-1 in the fingerprint region between 699 and 1030 cm-1 again proved the presence of the substituted olefinic structure on the macromolecular chain of petroleum resin. 1604cm-1 is the characteristic absorption peak of the benzene ring double bond in the molecular chain of petroleum resin. The absorption peak of the external bending vibration of the benzene ring unsaturated C-H in the fingerprint region reflects the characteristics of the benzene ring in the petroleum resin macromolecule. In addition, 2360cm-1 for the accumulation of double-key characteristic absorption, is the process of CO2 generated by the interference of the possibility of interference peak.
Because synthetic C-9 petroleum resin raw materials, many components, so the reaction between each other is also very complex. For example, in the thermal polymerization of petroleum resin, the main components of the raw materials of styrene, vinyl toluene, dicyclopentadiene, indene, methyl indene and so may occur copolymerization or self-polymerization reaction, Figure 1 is the styrene and indene The molecular structure of the AABAA-type block polymer, which is the theoretical product of copolymerization.
These end groups contain unsaturated double bonds. In this way, the molecular structure of the -AABAA-type block polymer is a good representation of the molecular characteristics of macromolecules of petroleum resin polymers, with aliphatic hydrocarbons containing aromatic ring substituents as the main chain and the terminal groups being substituted with unsaturated double bonds group, which is consistent with the results of the infrared spectrum analysis. The main chain of petroleum resin gives the resin macromolecules with good hydrophobic properties. In the daily study, only organic solvents can be used as the carrier of dissolution. From the above experimental results, it can be seen that the unsaturated double at the end of the molecular chain of petroleum resin It is possible to chemically modify the petroleum resin. Through these unsaturated double bonds, we can introduce a series of active monomers such as maleic anhydride, fumaric acid and methacrylic acid to improve the compatibility with polar compounds And dispersibility, it can be further made into water-based emulsion, which out of the organic solvent troubles. The size of the degree of polymerization n in the formula determines the amount of unsaturated double bonds contained in the petroleum resin.