Nylons, amorphous, barrier properties

Nylon, amorphous PET. PETG Excellent abrasion resistance, moisture sensitive Good barrier properties, not weatherable. clarity dependent on processing, orientation greatly increases physical properties... 

The chapters devoted to structure-permeability properties of the more commercially advanced amorphous nylons (Chapter 5 (50)) and experimental polycarbonates (Chapter 7 (51)) illustrate many of the general principles needed for optimizing the barrier properties of essentially any polymer family. These chapters consider the importance of intersegmental packing and intrasegmental mobility on... 

General Description DuPont Selar PA is an amorphous nylon (polyamide [PA]) resin that exhibits superior transparency good barrier properties to gases, water, solvents, and essential oils and high-temperature structural properties.P ]... 

Film Applications The amorphous nylons can be used in flexible or rigid packaging, and monolayer or multilayer films. Selar PA is suitable for a variety of packaging applications that require clarity, barrier properties, and processing flexibility. Because of the excellent barrier properties in refrigerated conditions. 

Because of the capacity to tailor select polymer properties by varying the ratio of two or more components, copolymers have found significant commercial appHcation in several product areas. In fiber-spinning, ie, with copolymers such as nylon-6 in nylon-6,6 or the reverse, where the second component is present in low (<10%) concentration, as well as in other comonomers with nylon-6,6 or nylon-6, the copolymers are often used to control the effect of sphemUtes by decreasing their number and probably their size and the rate of crystallization (190). At higher ratios, the semicrystalline polyamides become optically clear, amorphous polymers which find appHcations in packaging and barrier resins markets (191). 

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