Szczegóły publikacji
Opis bibliograficzny
FT-IR and FT-Raman studies of cross-linking processes with $Ca^{2+}$ ions, glutaraldehyde and microwave radiation for polymer composition of poly(acrylic acid)/sodium salt of carboxymethyl starch – In moulding sands, Pt. 2 / Beata GRABOWSKA, Maciej SITARZ, Ewa OLEJNIK, Karolina KACZMARSKA, Bożena Tyliszczak // Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy ; ISSN 1386-1425. — 2015 — vol. 151, s. 27–33. — Bibliogr. s. 33, Abstr.
Autorzy (5)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 91341 |
|---|---|
| Data dodania do BaDAP | 2015-09-07 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.saa.2015.06.084 |
| Rok publikacji | 2015 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Spectrochimica Acta, Part A, Molecular and Biomolecular Spectroscopy |
Abstract
The hardening process of moulding sands on quartz matrices bound by polymer binders containing carboxyl and hydroxyl groups can be carried out by using physical (microwave radiation, thermal holding) and chemical (Ca2+ cations, glutaraldehyde) cross-linking agents. The highest hardening level obtain moulding sand samples containing binders in a form of the aqueous composition of poly(acrylic acid)/sodium salt of carboxymethyl starch (PAA/CMS-Na) within the microwave radiation field, for which the bending strength is of 1.6 MPa value even after 24 h from ending the agent activity. The authors focused, in this study, on finding the reason of this effect. It was shown, by means of the FT-IR and FT-Raman spectroscopic methods, that the chemical adsorption process activated by microwaves plays an essential role. The applied microwaves activate the polar groups present in the polymer composition structure as well as the quartz crystals surfaces (silane groups). Then the chemical adsorption occurs in the binder-matrix system within the microwave radiation field and intermolecular lattices are formed with a participation of hydrogen bridges (SiOH⋯OC, SiOH⋯OH) and COSi type bonds. © 2015 Elsevier Ltd. All rights reserved.
