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Tensile properties poly

In conventional tenter orientation, the sequence of steps is as described above (MD—TD). In some cases it is advantageous to reverse the draw order (TD—MD) or to use multiple draw steps, eg, MD—TD—MD. These other techniques are used to produce "tensilized" films, where the MD tensile properties are enhanced by further stretching. The films are generally unbalanced in properties and in extreme cases may be fibrillated to give fiber-like elements for special textile appHcations. Tensilized poly(ethylene terephthalate) is a common substrate for audio and video magnetic tape and thermal transfer tape. [Pg.381]

Hydrolysis studies compared a polycarbonate urethane with a poly(tetramethyl-ene adipate) urethane and a polyether urethane based on PTMEG. After 2 weeks in 80°C water, the polycarbonate urethane had the best retention of tensile properties [92], Polycarbonates can hydrolyze, although the mechanism of hydrolysis is not acid-catalyzed, as in the case of the polyesters. Polycarbonate polyurethanes have better hydrolysis resistance than do standard adipate polyurethanes, by virtue of the highest retention of tensile properties. It is interesting to note in the study that the PTMEG-based urethanes, renowned for excellent hydrolysis resistance, had lower retention of physical properties than did the polycarbonate urethanes. [Pg.808]

Table 7.1 The effect of particulate fillers on tensile properties of poly(ethylene) (filler concentration 25 parts/lOO of polymer by weight)... Table 7.1 The effect of particulate fillers on tensile properties of poly(ethylene) (filler concentration 25 parts/lOO of polymer by weight)...
Jha A. and Bhowmick A.K., Thermoplastic elastomeric blends of poly(ethyleneterephthalate) and carylate rubber 1. Influence of interaction on thermal, dynamic mechanical and tensile properties. Polymer, 38, 4337, 1997. [Pg.156]

ISO 6259-2 1997 Thermoplastics pipes - Determination of tensile properties - Part 2 Pipes made of unplasticized poly(vinyl chloride) (PVC-U), chlorinated poly(vinyl chloride) (PVC-C) and high-impact poly(vinyl chloride) (PVC-HI)... [Pg.324]

ISO 4433-3 1997 Thermoplastics pipes - Resistance to liquid chemicals - Classification -Part 3 Unplasticized poly(vinyl chloride) (PVC-U), high-impact poly(vinyl chloride) (PVC-HI) and chlorinated poly(vinyl chloride) (PVC-C) pipes ISO 6259-2 1997 Thermoplastics pipes - Determination of tensile properties - Part 2 Pipes made of unplasticized poly(vinyl chloride) (PVC-U), chlorinated poly(vinyl chloride) (PVC-C) and high-impact poly(vinyl chloride) (PVC-HI)... [Pg.331]

Table 4. Tensile properties of the poly(CL-[7-DXO-[7-CL) ABA triblock copolymers (see Scheme 39) ... Table 4. Tensile properties of the poly(CL-[7-DXO-[7-CL) ABA triblock copolymers (see Scheme 39) ...
Table 1. Tensile Properties of Braided Poly(Lrlactide) and 95/5 Poly(Hactice-co-glycolide) Yams... Table 1. Tensile Properties of Braided Poly(Lrlactide) and 95/5 Poly(Hactice-co-glycolide) Yams...
In most of the previous work with polyimide fibers, the fibers were spun from poly(amic acid) precursors, which were thermally imidized in the fiber form. However, high degrees of imidization were not achieved. Thus, tensile properties of these polymers were not as good as those of high-performance fibers. Work in our laboratories has shown that when the fibers are spun directly from preimidized polymers, it is possible to achieve tensile properties that are as good or even better than those of poly(p-phenyleneterephthalamide) (PPTA or Kevlar ) fibers. For example, fibers have been prepared from m-cresol solutions of BPDA-PFMB using a dry-jet wet-spinning method. The as-spun fibers were then extensively drawn and annealed above 400°C to achieve excellent mechanical properties. [Pg.361]

In addition, ASA may be blended with other polymers that themselves exhibit high heat distortion temperatures. For example, blends of poly(ether imide) and ASA exhibit an improved heat distortion temperature, improved flexural properties and tensile properties in comparison to the ASA component alone and have lower impact strengths as well (35). The statement above has been exemplified using Ultem 1000 as a poly(ether imide) resin and Geloy 1020 as ASA component. [Pg.341]

Within the past several years, improvements in the toughening of high-temperature epoxies and other reactive thermosets, such as cyanate esters and bismaleimides, have been accomplished through the incorporation of engineering thermoplastics. Additions of poly(arylene ether ketone) or PEK and poly(aryl ether sulfone) or PES have been found to improve fracture toughness. Direct addition of these thermoplastics generally improves fracture toughness but results in decreased tensile properties and reduced chemical resistance. [Pg.241]

Fiber Properties. One of the polymers, the poly(isophthalamide) of 4,4 -diaminoazobenzene (IV), was selected for investigation of fiber properties of aromatic azopolymers. Table III shows standard tensile data of the "as spun as well as the hot-drawn (1.5X, 350°C.) fiber. As shown, this polymer has tensile properties fairly typical of an aromatic polyamide. [Pg.705]

Ethylene copolymers were compared with liquid plasticisers for use as additives to improve the flexibility of poly(vinyl chloride) (PVC) for electrical cable insulation applications. The PVCs were assessed by determining smoke generation, flammability, tensile properties and the low temperature brittle point. The ethylene copolymers gave similar peak heat release rates, but the peak smoke and the total smoke generation were lower. They also gave similar or increased strength, similar elongation and flexural modulus, and lower brittle point temperatures. 4 refs. [Pg.97]

TENSILE PROPERTIES OF POLY(VINYL CHLORIDE) FILLED WITH PRECIPITATED CALCIUM CARBONATE... [Pg.133]

Nylon-6,6 can be made into articles with tensile strengths around 12,000 psi or into other articles with tensile strengths around 120,000 psi. What is the basic difference in the processes used to form these two different articles Why do poly isobutene properties not respond in the same manner to different forming operations ... [Pg.441]

Thus, Hope and his coworkers concluded for the solid-state extrusion of linear poly-ethylenes that increasing the molecular wei t reduced both the maximum degree of deformation and the tensile properties of the jaoduct. Hie sother hand, increased the maximum degree of deformation. The degree of stiffness enhancement upon extrusion and the melting points of the products were reduced. [Pg.128]

Figure 12 shows the influence of the nominal draw ratio on the tensile properties for the poly(ether ester) C. The initial tensile modulus was nearly independent of the draw ratio. A higher strains the modulus increased proportionally to the draw ratio. As can be seen from Fig. 13, the effect of the extrusion velodty on the tensile properties was rather small. [Pg.133]

Figure 15.12 shows the fatigue resistance of carbon and glass fiber filled poly(phenylene ether ketone).The flexural fatigue depends on tensile properties of the composite. The yield strength of the matrix and the quality of the interface affect the fatigue properties of composites. [Pg.637]

Lee and Wang [80] investigated the effects of lysine-based diisocyanate (LDI) as a coupling agent on the properties of biocomposites from PLA, poly (butylene succinate) (PBS) and bamboo fiber (BF). They observed that the tensile properties, water resistance, and interfacial adhesion of both PLA/BF and PBS/BF composites were improved by the addition of LDI, but thermal flow [81] was hindered due to cross-linking between polymer matrix and BF. Enzymatic biodegradability of... [Pg.74]

In the early 1950 s, B.F. Goodrich introduced the first commercial elastomer based on ionic interactions, a poly(butadiene-co-acry-lon1trile-co-acrylic acid). Typically less than 6% of carboxylic monomer 1s employed in order to preserve the elastomeric properties inherent in these systems. When neutralized to the zinc salt, these elastomers display enhanced tensile properties and improved adhesion compared to conventional copolymers. This enhancement of properties can be directly attributed to ionic associations between the metal carboxylate groups. [Pg.8]

Block copolymers constituted so that the hard A blocks show increased glass temperatures might be expected to show better ultimate tensile properties than comparable block copolymers of a lower Tg in the glassy phase (12). This is demonstrated in the present system by substituting the major portion of the polystyrene in the present system for poly (a-methylstyrene). A short length of polystyrene is included at each chain end of the hard block to facilitate the second step of the synthesis and to give a more stable polymer. The effect of replacing... [Pg.256]

Multiblock copolymers based on poly(a-methylstyrene) also show significantly better oxidative thermal stability than the block copolymers based on polystyrene. Thus, polystyrene-polydimethyldisiloxane multiblock copolymers lose half of their tensile strength after 80 hours with considerable yellowing at 150°C in air, but corresponding materials based on poly( -methylstyrene) show no discoloration or loss in tensile properties under the same conditions. [Pg.258]


See other pages where Tensile properties poly is mentioned: [Pg.807]    [Pg.592]    [Pg.895]    [Pg.82]    [Pg.131]    [Pg.229]    [Pg.96]    [Pg.235]    [Pg.77]    [Pg.365]    [Pg.115]    [Pg.65]    [Pg.77]    [Pg.58]    [Pg.93]    [Pg.171]    [Pg.279]    [Pg.1981]    [Pg.12]    [Pg.255]    [Pg.10]    [Pg.222]    [Pg.291]   
See also in sourсe #XX -- [ Pg.624 ]




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