Dispersion resins tensile development

The simple, SBS/PA blends were in parallel development with the PPE/SBS/PA ones. AdditiOTi of SBS to PA improved the tensile and impact strength of the latter resin. The blends comprise either 1-25 wt% SBS as a dispersed or at higher concentration as co-continuous phase (see Table 1.24). 

Wood fiber - recycled plastic composite lumber is a relatively new development and is similar to PS addition to plastic lumber because the potential exists for improved mechanical properties and dimensional stabilities. Wood fiber addition can serve as an excellent reinforcement for plastics, and wood fibers are abundant, lightweight, nonabrasive, nonhazardous and inexpensive. An effort is being made to examine the incorporation of treated and untreated aspen fibers into recycled HDPE milk bottles [Yam et al., 1990]. The work has shown tensile strength and Izod impact strength below that of HDPE alone when aspen fiber is added. Tensile modulus and flexural modulus are increased significantly above HDPE alone with the addition of wood fiber. Dispersion of the fiber in the resin has been reported as a dominating factor in the process thus far. 

The mechanical properties of PETP fibres are dictated by the amount of cold drawing of the amorphous fibre—the longer the draw the higher the crystallinity and tensile strength developed. PETP fibres are dyed almost exclusively using dispersed dyes (see section 2.4.2.4). For permanent press polyester/cotton apparel, the press is obtained by treating the material with UF resin (i.e. only the cotton fibre is modified). 

---