Injection molded specimens moduli

Because as-spun fibers of Me-HQ/Cl-PEC showed a higher modulus than those of Ph-HQ/Cl-PEC, the flexural modulus of injection molded specimens of Me-HQ/Cl-PEC exhibited a higher flexural modulus than those of Ph-HQ/Cl-PEC due to the liquid crystalline state. Although flexural-fractured injection molded specimens of Me-HQ/Cl-PEC exhibited highly oriented fibrils, Ph-HQ/ Cl-PEC no longer displayed fibrils because of the lack of liquid crystallinity. 

Accordingly, we have evaluated the flexural modulus of injection molded specimens of CP-HQ/BB having higher F-values than those of Me-HQ/BB polyarylates. The flexural modulus of injection molded specimens of Me-HQ/BB... 

As-spun fibers of Ph-HQ/HQ/BB with m/n = 50/502 exhibited a much higher modulus (100 GPa) than Ph-HQ/BB (40GPa) due to the increased F-value and rigidity of the polymer chain. Injection molded specimens of Ph-HQ/HQ/BB with m/n = 50/50 exhibited a much higher modulus than those of Ph-HQ/BB due to the increased rigidity and packing density of the polymer chain upon copolymerization with HQ. However, the F-value of injection molded specimens of Ph-HQ/HQ/BB (m/n = 50/50) was not much higher than those of Ph-HQ/BB, as shown in Table 19.4. 

Thus, both the rigidity and packing density of the polymer chain seem to be more influential factors than the F-values in achieving a high modulus of injection molded specimens. Figure 19.10 shows the variation of the flexural moduli as a function of the F-values for various substituted-HQs/BB and substituted HQs/BB modified with DHB, HQ, 2,6-dihydroxynaphthalene (DHN), NDA, Cl-PEC and TA [31,32], We could find no relationship between them. 

Biocomposites from kenaf fiber and soy based polymers have been fabricated by extrusion, followed by injection or compression molding (26). It turned out that compression molded specimens have a similar modulus in comparison to injection molded specimens... 

Injection molded specimens were prepared according to ASTMD4101 methods. The specimens were tested for flexural modulus (MPa), tensile yield strength (MPa), tensile elongation at break (%), notched Izod impact (J/m), and HDT (°C). 

Semicrystalline PLA has a tensile strength of approximately 50-70 MPa, tensile modulus of 3000-4000 MPa, elongation at break of 2-10%, flexural strength of 100 MPa, and flexural modulus of 4000-5000 MPa [ 1-6], PLA specimens obtained by a typical injection molding process are generally almost amorphous, because of the slow crystallization kinetics characterizing this material. In Tables 11.1 and 11.2, the results of physicochemical and mechanical characterization of, respectively, PLLA and PDLLA injection molded specimens with different molecular weights are presented [7]. 

Flexural modulus and impact strength of injection molded specimens... 

Figure 10.6 shows the time evolution of dynamic storage modulus G of an injection-molded specimen of ester-based MDI/BDO/PTMA TPU at a fixed angular frequency ( >) of 0.56 rad/s during isothermal annealing for a period of 2 h at 170,... 

Malar Ausimont Specimen 3.2 mm (0.125 in) thick injection mold, tensile modulus, tensile strength and elongation at break... 

Ramiro et al studied the mechanical properties of directly injection molded specimens based on blends of poly (etherimide) (PEI) and polysulfone. The molded samples were composed of an almost pure PEI phase and a pure polysulfone phase. The measured modulus of elasticity was near to an additive relationship of the two component polymer values. The impact strength was higher than that of the poly (etherimide). The tensile strength and elongation at break were almost additive, suggesting that there is good interfacial adhesion between the two phases. The reported behavior of... 

The polyamide 66 composites exhibit sinular property trends and more evidence of fiber degradation. Injection molded specimens could not be tested due to too much degradation. The flexural properties of polyamide 66 conposites are shown in Table 4. Conqjared to neat polyamide 66 there is a drop in flexural strength and an increase in flexural modulus. The flexural moduli of polyamide 6 and 66 composites are similar whereas the strengths of the polyamide 66 composites are lower. These trends are consistent with the lower quality of the polyamide 66 composites. 

Fig. 12 a Elongation at break, break> and b Young modulus, Ey for the non-nucleated, calcium pimelate nucleated, NU-100 nucleated and y-quinacridone-modified PP homopolymers over the investigated MFR range. The test speed was 50 mm min-1 for the determination of break> 5 mm min-1 for the evaluation of E. The specimens were injection molded dog bones... 

The characteristics of the dependency of injection-molded NCH products on layer thickness have been investigated and reported [17]. An investigation of 0.5, 0.75, 1.0 and 2.0 mm-thick test specimens revealed that the thicker the product, the lower the elastic modulus under tension becomes. 

Injection molded bars of longitudinal PLC (poly(p-hydroxybenzoic acid-co-ethylene terephthalate) X7G ) showed a layered morphology [53]. Thinner specimens, of the order of 3 mm thick, showed three different layers symmetrically around the central plane of the specimen an oriented skin (s 0.5 Young s modulus at 23 C 15 GPa), an oriented layer beneath the skin (5 0.5-0.6 Young s modulus at... 

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