Plastics affordable

The wide application of plastics in agriculture has a decisive influence on cultivation practices. Plastic films used as a growing aid in the form of mulch and tunnel covers have increased yields. The debris of these films left behind after the harvest poses a serious disposal problem. The controlled photodegradation of plastics affords a workable solution not only to this problem but opens new possibilities of the programmed removal of the films even during the growing period of the crops when this is desirable. 

Thick plastic. Affordable, colorful, and dishwasher safe, thick plastic boards can double as trivets. Biggest pro easy to bleach and dishwash. Biggest con will nick and stain over time. 

As a class, ADP plasticizers afford reasonable FR efficiency with exceptionally... 

Elame-spread and smoke-density values, and the less often reported fuel-contributed semiquantitive results of the ASTM E84 test and the limited oxygen index (LOI) laboratory test, are more often used to compare fire performance of ceUular plastics. AH building codes requite that ceUular plastics be protected by inner or outer sheathings or be housed in systems aH with a specified minimum total fire resistance. Absolute incombustibHity cannot be attained in practice and often is not requited. The system approach to protecting the more combustible materials affords adequate safety in the buildings by aHowing the occupant sufficient time to evacuate before combustion of the protected ceUular plastic. 

Although these polymers have iaadequate stabiUty and processibiUty for most plastics appHcations, the abiUty to undergo scission back to the gaseous monomers has afforded some utility ia fabrication of electron-beam resists for photoUthography. Polybutene sulfone (251) and polyhexene sulfone (252) have been developed for this small-volume but high value appHcation. 

Cyclopentadiene oligomers have been formed by vapor deposition of CPD on kaolin to afford a sorbant for removal of oil from water (71). They are also employed as coatings for controlling release rates of fertilizers (72). Thermal addition of sulfur to a mixture of DCPD and CPD oligomers has led to a number of beneficial appHcations such as waste water oil adsorbant powdery foams (73), plasticized backing for carpets and artificial turfs (74), and in modified sulfur cements for encapsulating low-level radioactive wastes (75). 

It is instructive to describe elastic-plastic responses in terms of idealized behaviors. Generally, elastic-deformation models describe the solid as either linearly or nonlinearly elastic. The plastic deformation material models describe rate-independent behaviors in terms of either ideal plasticity, strainhardening plasticity, strain-softening plasticity, or as stress-history dependent, e.g. the Bauschinger effect [64J01, 91S01]. Rate-dependent descriptions are more physically realistic and are the basis for viscoplastic models. The degree of flexibility afforded elastic-plastic model development has typically led to descriptions of materials response that contain more adjustable parameters than can be independently verified. 

Since shape integrity under load is a major consideration for structural products, low modulus plastic products are designed shape-wise for efficient use of the material to afford maximum stiffness and overcome their low modulus. These type plastics and products represent most of the plastic products produced worldwide (1,3,6, 9,10,14, 20, 28, 35, 36, 62, 64). 

Cold flow studies have several advantages. Operation at ambient temperature allows construction of the experimental units with transparent plastic material that provides full visibility of the unit during operation. In addition, the experimental unit is much easier to instrument because of operating conditions less severe than those of a hot model. The cold model can also be constructed at a lower cost in a shorter time and requires less manpower to operate. Larger experimental units, closer to commercial size, can thus be constructed at a reasonable cost and within an affordable time frame. If the simulation criteria are known, the results of cold flow model studies can then be combined with the kinetic models and the intrinsic rate equations generated from the bench-scale hot models to construct a realistic mathematical model for scale-up. 

Completely dissolved pigments should be referred to as dyes and be tested as such. This concerns features such as the extraction properties in the finished article. In PS, SAN, and other transparent plastics with a high glass transition temperature, they afford transparent, glass clear colorations. 

P.R.151, a barium lake, being produced in Japan, affords a bluish red color, which may be referred to as carmine. Of medium tinctorial strength, the pigment is used primarily in plastics. 

P.R.211 is offered only in the Japanese market. It is the calcium salt of a monoazo pigment. P.R.211 affords shades of scarlet which resemble those provided by Lake Red C types (P.R.53 1). The list of suitable media includes plastics and printing inks. Incorporated in these media, P.R.211 presents application and fastness prop-... 

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