Nylon compositions

Many modifiers and additives have been described for use with nylon composites, but generally a small amount, 0.05—1 wt %, of a lubricity aid, such as sodium or 2inc stearate (4) is added to enhance both resin flow during processing and removal from the mold after consoHdation. 

Jao, S.H. and McGarry, F.J. (1992b). Interphase bond strength and energy absorption of injection-molded rubber coated glass/nylon composites. J. Reinforced Plast. Composite II, 811-835. 

Strengths of compression-molded fiberglass-nylon composites... 

Figure 3. Uniaxial deformation behavior of a thin film PP-nylon composite. See text for the description of the sequence.

FRACTURE BEHAVIOUR OF SHORT GLASS FIBRE-REINFORCED RUBBER-TOUGHENED NYLON COMPOSITES... 

Fracivre Behaviour of Short Glass Fibre-Reinforced Rubber- Toughened Nylon Composites 401... 

Fig. 6 Influence of the concentration of fibres and state of fibre/matrix interface on the uniaxial tensile stress-strain curves of fibre-reinforced nylon composites (a) type A interface (b) type B interface.

Figure 7. Permeability losses in HOPE—nylon laminar-walled containers using different nylon compositions (Selar I and Selar II) [A] xylene [B] xylene methanol 85 15 [C] xylene methanol water (96.5 3.5 0.5). Permeability denoted as (grams—mils/day, GMD). (Reprinted with permission from Ref. 7. Copyright 1989 Society of Automotive Engineers.)...

Excellent elastomeric NBR-nylon compositions have also been prepared by dynamic vulcanization during the melt-mixing of intimate blends of NBR with various nylons. In this case, the effect of curatives was complicated by the fact that some nitrile rubbers tend to self-cure at temperatures of mixing. Sulfur,... 

Among various nylon compositions, nylon-6 and nylon-6,6 are by far the most important polyamides for the commercial production of fibers and resins. This chapter will focus largely on the fiber-related aspects of these two nylons. Other nylons marketed for minor fiber applications will be discussed appropriately. A wealth of information on nylon technology exists in the literature [4-8]. 

Has Hashemi, S., Mugan, J. Fracture mechanics of short glass fibre-reinforced nylon composite. J. 

Ilardo, Ch. S. and Duffy, J. J. Flame retardant nylon compositions with improved tracking index. Proc. Annual Technical Conf. SPI Reinforced Plastics Div., ANTEC 85, p. 516-519. SPI Reinforced Plastics DIV. 

Papazoglou and Rosenthal[71] produced nylon blends having improved low-temperature properties. Moldable nylon-6 blends with improved low-temperature impact strength and reduced brittleness were prepared by melt blending nylon-6, maleic anhydride-g-ethylene-propylene-diene terpolymer, and rubber modified styrene-maleic anhydride copolymer. The impact property of the rubber-modified nylon composition is given in Table 5. The blend components were melt blended at temperatures between 260 and 310 °C. As a standard, all three components of the blend were simultaneously melt blended (A). Nylon-6 was melted first and then the functionalized terpolymer was melt blended prior to downstream introduction of the rubber modified copolymer (B). Nylon-6 and the functionalized terpolymer were first melt blended and then the rubber modified copolymer was added to the melted mixture at a downstream feed port (C). 

Excellent elastomeric NBR-nylon compositions have also been prepared by dynamic vulcanization during the melt-mixing of intimate blends of NBR with various nylons. In this case, the effect of curatives was complicated by the fact that some nitrile rubbers tend to self-cure at temperatures of mixing. Sulfur, phenolic, maleimide, or peroxide curatives can be used. The thermoplastic elastomeric compositions prepared by the dynamic vulcanization of nylon-NBR blends are highly resistant to hot oil. As in the case of the EPDM-polyolefin blends, increases in the amount of rubber in the composition reduce stiffness but increase resistance to permanent set. 

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