Polypropylene, tensile properties table

Table 11.4 Effect of percentage stretch on tensile properties of polypropylene film ...

Weakening effect of nanoparticles was observed not only with wood-flonr-filled polypropylene (Tables 4.28-4.30) bnt also with rice-hnlls-fllled polypropylene on both tensile and flexural properties (Tables 4.31 and 4.32). 

Examination of Table III shows that the nonoriented polyolefins possess 293 K tensile strengths and tensile moduli well below cable specifications. However, oriented polypropylene and polyethylene tapes have superior tensile properties at this temperature. 

Table 2.5 clearly Indicates that the mechanical properties of solid-state extruded HOPE are much superior to the melt extruded HDPE. In fact, the tensile strength of solid-state extruded HDPE is about the same as carbon steel There are some other interesting benefits associated with solidstate extrusion of polymers. There is essentially no die swell at high extrusion ratios (extrusion ratio is the ratio of the area in the cylinder to the area in the die). Thus, the dimensions of the extrudate closely conform to those of the die exit. The surface of the extrudate produced by hydrostatic extrusion has a lower coefficient of friction than that of the un-oriented polymer. Above a certain extrusion ratio (about ten), polyethylene and polypropylene become transparent. Further, solid-state extruded polymers maintain their tensile properties at elevated temperatures. Polyethylene maintains its modulus up to 120°C when it is extruded in the solid state at a high extrusion ratio. The thermal... 

TABLE 3-93. TENSILE PROPERTIES OF INJECTION MOLOED POLYPROPYLENE AT 23° AND 90°C (REF. 42)... 

TABLE 6.1 Tensile properties and electrical resistivity of melt-spun conventional composite fibers of polypropylene/carbon fiber (spun at 220°C and a draw ratio of 1.0)... 

Knappe and Kress investigated the influence of repeated injection molding on the mechanical properties of samples for many different thermoplastics (Table 2.6) [32]. Similar experiments have also been performed by Shishova [33] and by Akutin and their co-workers [34] on polypropylene and polycarbonate, respectively, where decreases in tensile properties were found with repeated processing. Similar effects have also been reported during mixing of polyolefin melts in different equipment [30]. 

Table 7.3 Comparison of the tensile properties of longitudinally and randomly oriented solution-mixed sisal fiber-reinforced polypropylene (PP), polystyrene composites, and low density polyethylene (LDPE) (fiber length 6 mm).

Table 1. Tensile Properties of Polypropylene (ASTM D638)...

Table 7.10 somewhat positions typical natural fibers such as jute and kenaf vs. glass fiber, when used at equal level in polypropylene. Tensile, flexural, and impact properties, along with water absorption and specific gravities were measured on injection molded samples. As can be seen, natural fibers composites are quite challenging the glass fibers-filled composite with however a significant difference in moisture sensitivity. 

The physical properties of polypropylene, poly(ethylene terephthalate), and polyimide are greatly influenced by orientation of the polymer. Polypropylene and poly(ethylene terephthalate) become highly crystallized upon stretching. Oriented, crystalline poly(ethylene terephthalate), for example, has significantly higher modulus, tensile strength, and continuous use temperature than its extruded, unoriented analog (see Table II). 

Cellulose fiber is a good reinforcing tiller. In fact, this is one of the two major factors of the very existence of WPC materials (a) to make the composite material less expensive and (b) to obtain material with overall better properties compared to neat plastic, on the one hand, and wood, on the other. For example, tensile modulus of a particular sample of neat polypropylene was 203,000 psi, whereas for the same polypropylene filled with 40% of jute it was 1,030,000 psi. For a comparison, for the same polypropylene filled with 40% glass fiber it was 1,100,000 psi. Tensile modulus for natural fiber itself is in the range of 3,800,000-17,400,000 psi [135]. Table 3.4 shows data in more detail. 

With respect to tensile modnlns, of 11 cases in Table 5.7, five maleated polyolefins show decrease in the property (an Epolene, maleated polypropylenes and a Polybond), in five cases there was practically no effect (within 10% of the control), and in only one case an increase by 24% was observed (Polybond 3029). 

As can be seen finm Table 2, first two samples (1,2) have hig tensile stra th and elimgation than other two (3,4) bandages. elongation properties of the bondages vdiich contain bamboo and polypropylene fibres are better than soyabean and polyester fibre fiibric. 

TABLE 52.6. Variation in the tensile strength, modulus of elasticity, elongation, and some electrical properties with irradiation dose in polypropylenes. 

Studies carried by Leao et al. [28] showed that 70% sisal fiber content in sisal polypropylene composites gave maximum tensile strength and Young s modulus, but flexural strength and flexural modulus property were found to be optimum in 60% sisal fiber, as given in Table 22.10 [28],... 

See Table 14.38 for formulations that give maximum predicted tensile strength and flexural properties. Maximum predicted tensile strength, 44.3 MPa, was obtained with 40 wt% mica, 47.3 wt% polypropylene, 5.7 wt% Exact 4033, and 7 wt% Unite MP-1000. 

Table 14.38 Formulations for Maximum Predicted Tensile and Flexural Properties HiMod-360 Mica in Polypropylene...

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