Pulp composition

FIGURE 12.18 Stress-strain curves of rubber-fiber composites developed for solid rocket motor insulator A, ethylene-propylene-diene monomer (EPDM) rubber-carbon fiber composites B, EPDM mbber-melamine fiber composites C, EPDM mbber-aramid fiber composites and D, EPDM rubber-aramid pulp composites. 1 and 2 stands for unaged and aged composites respectively. Carbon fiber- and melamine fiber-reinforced composites contain resorcinol, hexamine, and silica in the concentrations 10, 6 and 15, respectively and aramid fiber- and aramid pulp-based composites contain resorcinol, hexamine, and silica in the concentrations 5, 3 and 15, respectively. (From Rajeev, R.S., Bhowmick, A.K., De, S.K., and John, B., Internal communication. Rubber Technology Center, Indian Institute of Technology, Kharagpur, India, 2002.)... 

Figure 4. Predicted composition of the pulp and juice compartments A Pulp composition B Juice composition...

Table V. Wood and Pulp Composition Mannana Xylanh ...

Paper Sample Pulp Composition pH Internal Size... 

Sodium hydroxide appears to be the most important alkali employed in commercial operations, and two general methods for its use are of importance. One method employs dilute, sodium hydroxide solutions at elevated temperatures, and the other uses concentrated solutions at low temperatures. In the hot, alkaline refining process, temperature, time, concentration of alkali, and consistency of pulp may be varied over wide limits. The literature contains only a limited amount of data showing the effect of alkaline treatment on sulfite-pulp composition. However, from the available data, certain principles are apparent. 

Samples of varying pulp composition, varying filler content, and those with and without both bulk and surface sizing are discussed. The performance differential of the various paper surfaces in the adhesion of thermally fused, xerographically toned images is addressed. 

Figure 3. Tensile Strength of Polypropylene-High Legnin Thermomechanical Pulp Composites vs. Filler Concentrations for Various Fiber Lengths.

Thermomechanical Pulp Composites vs. Filler Concentrations for Various Fiber Lengths. 

Chen, F., Liu, L. S., Cooke, P. H., Hicks, K B., and Zhang, J. (2008] Performance enhancement of poly(lactic acid] and sugar beet pulp composites by improving interfacial adhesion and penetration, Ind. Eng. Chem. Res., 47,8667-8675. 

Figure 11.12 The effect of matrix composition (paste vs. mortar) in room temperature cured cellulose-pulp composites on the (a) flexural strength and (b) toughness (after Coutts [46]).

Cellulose-pulp composites are generally less sensitive to degradation effects [21,57,65]. This is in part due to the better alkaline resistivity of the treated pulp. Natural and accelerated weathering can lead to improvement or decline in the properties of the cellulose-cement composites, depending on the type of ageing. Water immersion has little influence on the properties [9,66,67], Figure 11.20,... 

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