Advances in Diverse Industrial Applns of Nanocomposites by B. Reddy

By B. Reddy

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A temperature of 45 ˚C was proposed to be optimal and could lead to an efficient hydrolysis yielding an ivory-white colored suspension with a reported yield of 44% after 1 hour. It was also found that the total sulfur content and surface charge of nano whiskers gradually increased when increasing the hydrolysis reaction time from 10 to 240 min at 45˚C. The whiskers size decreased in the early stage of the hydrolysis and a relatively stable dimension was achieved after 1 hour as summarized in Table 5.

1998). , 4 wt% for a salt-free whiskers suspension. , 2005). It is not possible to observe any chiral nematic phase of whiskers hydrolyzed by other acids. , 2000). 3. 1 Starting materials Starting materials are highly important in view of the desired properties for specific applications of PUs. In general, at least two polyols and an isocyanate are required for a proper performance of PU. Difunctional polymers are preferred for a linear or low crosslinked PU as illustrated in Figure 2. ’s work (2006), a mixture of di- and multi-functional polyols and polymeric 4,4’-diphenylmethane diisocyanate (MDI) were used.

A. (2007). A high strength nanocomposite based on microcrystalline cellulose and polyurethane. Biomacromolecules, 8, 12, 3687-3692 Xu, Z. ; Tang, X. ; Gu, A. J. & Fang, Z. P. (2007). Novel preparation and mechanical properties of rigid polyurethane foam/organoclay nanocomposites. ; Yoshioka, M. & Shiraishi, N. (1995). Rigid polyurethane foams from combined liquefaction mixtures of wood and starch. Mokuzai Gakkaishi, 41, 7, 659-668 Zoppe, J. ; Peresin, M. ; Venditti, R. A. & Rojas, O. J. (2009).

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