Evalution of various parameters in synthesis of PNS

Document Type : Research Article

Authors

1 Polymer&color Engineering,amirkabir university of technology,tehran,iran

2 Color & Polymer Research Center, Amirkabir University of Technology

3 Department of Polymer Engineering Amirkabir University of Technology

4 Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR, Karaj, Iran

/amnc.2019.7.28.3

Abstract

PNS is one of the chemical additives that used as a dipersing agents in various applications.
Synthesis of this material was done in 2 stage: 1. Sulfonation of naphthalene 2. Polymerization of beta naphthalene sulfonate. The influence of various parameters was studied on synthesis stages of this substance.ft-it and H-NMR were used to identify the chemical structure of synthesized product. Purity of beta naphthalene sulfonate was confirmed by melting point test. Assessment of molecular weight and evaluation of molecular weight was done by preparing GPC photograph and the result was compared by a known comercial grade . The result showed that the increase of formaldehyde and the use of the catalysis during the polymerization reaction lead to increase of the molecular weight. On the other hand when the molar ratio of formaldehyde to naphthalene sulfonate was tripled PNS didn’t dissolve in the aqueous media. existente of sodium sulfate as impurities was evaluated by XRD. The use of a mixture of sodium and calcium hydroxide as a neutralizing agents resulted in a partial refuction of sodium sulfate.

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References

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