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SAYYAH, SAAD and ELWY: Characterization of resins prepared by polycondensation of egyptian bagasse pith and bisphenol A. I1 Act. Polymeriu 41 (1990) Nr. 1 63 initiation system used, and could b e ascribed t o greater availability of MAA a t higher monomer concentration. It is understandable that greater monomer availability would enhance participation of t h e monomer in t h e initiation and propagation processes. As a result t h e extent of polymerization increases. AcknowledgementDifferent resins were prepared by polycondensation of bisphenol A with compounds which may be produced during the acid hydrolysis of bagasse pith, e.g., glucose, xylose, and furfural. Further bisphenol A was condensed with constituents of bagasse pith, namely, pure soda lignin, holocellulose and resistant cellulose. The optimum conditions for thin layer chromatographic separation of these polycondensates were determined. Charakterisierung von Polykondensationsharzen aus agyptischem Bagassemark und BisphenolA . Teil I I . Elementaranalyse und Diinnschichtchromatographie Durch Polykondensation von Bisphenol A mit Verbindungen, die bei der Saurehydrolyse von Bagassemark entstehen, z. B. Glucose, Xylose und Furfural, wurden verschiedene Harze hergestellt. Weiterhin wurden Polykondensationsprodukte von Bisphenol A mit Bestandteilen des Bagassemarks, wie reines Sodalignin, Holocellulose und resistente Cellulose, erzeugt. Die optimalen Bedingungen fur die Trennung dieser Polykondensate durch Dunnschichtchromatographie wurden ermittelt. Xapaxmepucmuxu caon, noAyueunbax nonuxonaeucayueg ezunemcEoii Bazaccbc u 6uc@enoaa A . Yacma I I . 3nmenmnbaii ananus u monxocaoiinas xpoaamozpa$u n3rOTOBJIeHbI HeKOTOpbIe CMOJIM IIyTeM II0JIllKOH~eHCaqHtl6IIc@e~ona A C COepiHeHURMH, IIOJlyYeHHMMH KIICJIOT-HbIM rMApOJIH30M 6aracc61, KPK HanpHMep rJIIOK03a, IECHJIO3a ki (PYP(PYp0JI. nOJIy'XeHbl TPKH(e IIp0AyKTk.l IIOJIII-KOHAeHCaqHH 6 n c @ e~o n a A C COCTaBHbIMII 'IaCTJ3MM Baraccb~, TaKMMH KPK COAaJIUrHHH, rOJIOqeJIJIIOJIO3a II YCTOfi-'XIIBaJ3 qeJIJIIOJI03a. 16bIJIH OIIpeAeneHbl OIITHMaJlbHbIe YCJIOBIIR pa3AeJIeHHfi ZJTHX IIOJIHKOH~eHCaTOB MeTOAOM TOH-K O C J I O~~H O~ xpoMaTorpa@m.
SAYYAH, SAAD and ELWY: Characterization of resins prepared by polycondensation of egyptian bagasse pith and bisphenol A. I1 Act. Polymeriu 41 (1990) Nr. 1 63 initiation system used, and could b e ascribed t o greater availability of MAA a t higher monomer concentration. It is understandable that greater monomer availability would enhance participation of t h e monomer in t h e initiation and propagation processes. As a result t h e extent of polymerization increases. AcknowledgementDifferent resins were prepared by polycondensation of bisphenol A with compounds which may be produced during the acid hydrolysis of bagasse pith, e.g., glucose, xylose, and furfural. Further bisphenol A was condensed with constituents of bagasse pith, namely, pure soda lignin, holocellulose and resistant cellulose. The optimum conditions for thin layer chromatographic separation of these polycondensates were determined. Charakterisierung von Polykondensationsharzen aus agyptischem Bagassemark und BisphenolA . Teil I I . Elementaranalyse und Diinnschichtchromatographie Durch Polykondensation von Bisphenol A mit Verbindungen, die bei der Saurehydrolyse von Bagassemark entstehen, z. B. Glucose, Xylose und Furfural, wurden verschiedene Harze hergestellt. Weiterhin wurden Polykondensationsprodukte von Bisphenol A mit Bestandteilen des Bagassemarks, wie reines Sodalignin, Holocellulose und resistente Cellulose, erzeugt. Die optimalen Bedingungen fur die Trennung dieser Polykondensate durch Dunnschichtchromatographie wurden ermittelt. Xapaxmepucmuxu caon, noAyueunbax nonuxonaeucayueg ezunemcEoii Bazaccbc u 6uc@enoaa A . Yacma I I . 3nmenmnbaii ananus u monxocaoiinas xpoaamozpa$u n3rOTOBJIeHbI HeKOTOpbIe CMOJIM IIyTeM II0JIllKOH~eHCaqHtl6IIc@e~ona A C COepiHeHURMH, IIOJlyYeHHMMH KIICJIOT-HbIM rMApOJIH30M 6aracc61, KPK HanpHMep rJIIOK03a, IECHJIO3a ki (PYP(PYp0JI. nOJIy'XeHbl TPKH(e IIp0AyKTk.l IIOJIII-KOHAeHCaqHH 6 n c @ e~o n a A C COCTaBHbIMII 'IaCTJ3MM Baraccb~, TaKMMH KPK COAaJIUrHHH, rOJIOqeJIJIIOJIO3a II YCTOfi-'XIIBaJ3 qeJIJIIOJI03a. 16bIJIH OIIpeAeneHbl OIITHMaJlbHbIe YCJIOBIIR pa3AeJIeHHfi ZJTHX IIOJIHKOH~eHCaTOB MeTOAOM TOH-K O C J I O~~H O~ xpoMaTorpa@m.
ZUSAMMENFASSUNG: Die Molrefraktionen (Rarl) phenolischer, in Dioxan geloster Mehrkernverbindungen wurden unter der Voraussetzung bestimmt, daB sich die Molrefraktionen additiv zusammensetzen. Die Verbindungen (oligomere Phenol-Formaldehyd-Kondensate) gehoren zwei homologen Reihen (Formel I und 11) an. Die erhaltenen RMl-Werte stimmen, wenn man von einer geringen Streuung absieht, mit den aus den Atomrefraktionen berechneten iiberein. Innerhalb einer homologen Reihe ist R M~ dem Molekulargewicht proportional. Wenn die spezifische Molrefraktion (REP) zur Molekulargewichtsbestimmung dienen SOU, dann sind Priizisionsmessungen von Brechungsindex und Dichte erforderlich. SUMMARY:The molar refractions (Rarl) of phenolic polynuclear compounds were determined in dioxane solution with the supposition that the molar refractions are additive. The compounds, oligomeric phenol formaldehyde condensates, are members of two homologous series (formulae I and 11). The R M~ values found are the same as those calculated from the atomic refractions if one neglects a little deviation. Ranl is proportional to the molecular weight within a homologous series. It is necessary to measure very precisely the refractive index and density if one wishes to determine the molecular weight by the specific molar refraction (REP) method.
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