Grewia

Alkaloids arc known in the family, including harman derivatives in Grewia. In this survey, the following were positive Grewia mi-crocos (2/2), G. vernicosa, Microcos paniculata (1/2), Triumfetta bait ram id (1/2). 

Grewia caffra Meisn. [liklolo, climbing raisin] (Tiliaceae) root bark infusion is used for urino-genital problems. The root baik contains anthranoids, glycosides and saponins (15). 

Alangium lamarckii Thw. Alangium salviifolium Wangerin Grewia IZ-S 37)... 

Singha, A. S., Thakur, V. K., Mishra, B. N. (2009). Study of grewia optiva fiber reinforced urea-formaldehyde composites, J. Polym. Mater, 26(1), 81-90. 

Flax Fibers Sisal Fibers Pine Fibers Grewia Optiva Hemp Fibers... 

A.S. Singha and V.K. Thakur, Synthesis and characterization of grewia optiva fiber-rein-forced PF-based composites. Int. /. Polym. Mater. 57, 1059-1074 (2008). 

A. S. Singha, and V. K. Thakur, Synthesis and characterizations of silane treated grewia optiva fibers. Int. J. Polym. Anal. Charact. 14,301-321 (2009). 

Keywords Grewia optiva, flammability, thermal stability, mechanical properties, UPE, benzoylation, FTIR... 

In the present chapter, we report some of om study on both raw and surface-modified Grewia optiva fiber-reinforced UPE matrix-based composites, which possess enhanced mechanical and physico-chemical properties when compared with UPE matrix. In addition to the effect of flame retardants, i.e., magnesium hydroxide and zinc borate, on flame resistance, the behavior of resulted Grewia optiva fiber-reinforced composites have also been evaluated and was foimd to be improved. A significant discussion on the work of other researcher s work has also been added in the chapter. 

Benzoylation of Grewia optiva fiber was carried out by using a 5 vol% benzoyl chloride in 10% alkali solution for 10-15 min as per procedure reported earlier [21]. Scheme 2 shows the possible mechanism for grafting of benzoyl chloride onto cellulosic fibers. 

Scheme 13.2 A possible mechanism for grafting of benzoyl chloride onto Grewia optiva fiber [22].

Figure 13.1 Tensile strength of different surface-modified Grewia optiva particle fibers-reinforced unsaturated polyester composites.

When reinforced with mercerized and benzoylated particle fibers. The UPE matrixhas been found to exhibit flexural strength of 55.26, 62.26, 66.29 and 57.26 MPa 61.7, 67.1, 69.52 and 62.32 MPa at 10,20,30 and 40% fiber loading, respectively. The results obtained were found to be consistent with results obtained in the case of AN graft copolymerized Grewia optiva fibers-reinforced unsaturated polyester composites [26]. Rai et al. have also reported similar results during their studies [16]. 

Figure 13.9 TGA curves for raw and surface-functionalized Grewia optiva fibers-reinforced unsaturated polyester matrix-based composites.

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