adequate coverage of extensive sample breakdown. Under the conditions employed, sulfuric acid appears to be only about one sixth as active in hydrolyzing cellulose as is hydrochloric acid of equivalent concentration.The data suggest that cellulose molecule sections which interlink the crystallites in the chain direction are attacked first. This part of the structure, highly hygroscopic and probably quite disorganized, represents relatively small percentages of the intact materials. Hydrolytic attack thereafter appears to be limited to lateral crystallite surfaces.Crystallite length estimates derived from viscosity data range from 280 glucose units for cotton to 110 for high tenacity viscose rayon. Mercerization apparently causes a reduction in crystallite length.
Es wird über die Synthese von methylsubstituierten, ein‐ und zweifach m‐gewinkelten Oligophenylenen bis zum Kondensationsgrad 14 berichtet. Durch Anwendung chromatographischer Methoden konnten die Verbindungen rein isoliert werden. Gewinkelte Oligophenylene besitzen bei vergleichbarer Struktur einen niedrigeren Schmelzpunkt und eine bessere Löslichkeit als p‐Oligophenylene.
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