Foamed plastics properties

CAS 1330-20-7 EINECS/ELINCS 215-535-7 Uses Surfactant for foamed plastics Properties Vise. 3-10 cst SS-10V [Nikko Chems. Co. Ltd]... 

The properties of commercial rigid foamed plastics are presented in Table 2. The properties of commercial flexible foamed plastics are presented in Table 4. The definition of a flexible foamed plastic is that recommended by the ASTM Committee D 11. The data shown demonstrate the broad ranges of properties of commercial products rather than an accurate set of properties on a specific few materials. Specific producers of foamed plastics should be consulted for properties on a particular product (137,138,142). 

Table 2. Physical Properties of Commercial Rigid Foamed Plastics ...

Structural Variables. The properties of a foamed plastic can be related to several variables of composition and geometry often referred to as stmctural variables. 

Polymer Composition. The piopeities of foamed plastics aie influenced both by the foam stmctuie and, to a gieatei extent, by the piopeities of the parent polymer. The polymer phase description must include the additives present in that phase as well. The condition or state of the polymer phase (orientation, crystallinity, previous thermal history), as well as its chemical composition, determines the properties of that phase. The polymer state and cell geometry are intimately related because they are determined by common forces exerted during the expansion and stabilization of the foam. 

Density. Density is the most important variable in determining mechanical properties of a foamed plastic of given composition. Its effect has been recognized since foamed plastics were first made and has been extensively studied. 

Glycols such as neopentyl glycol, 2,2,4-trimethyl-l,3-pentaiiediol, 1,4-cyclohexanedimethanol, and hydroxypivalyl hydroxypivalate are used in the synthesis of polyesters (qv) and urethane foams (see Foamed plastics). Their physical properties are shown in Table 1 (1 6). 

A. H. Landrock, Polyurethane Foams Technology Properties and Applications, Report 37, Plastic Technical Evaluation Center, Picatiuny Arsenal, Dover, N.J., 1969. 

PS Foams. The eady history of foamed PS is available (244), as are discussions of the theory of plastic foams (245). Foamable PS beads were developed in the 1950s by BASF under the trademark of STYROPOR (246—248). These beads, made by suspension polymerization in the presence of blowing agents such as pentane or hexane, or by post-pressurization with the same blowing agents, have had an almost explosive growth, with 200,000 metric tons used in 1980. Some typical physical properties of PS foams are Hsted in Table 10 (see Foamed plastics). 

Example 3.15 A sandwich moulding is made up of solid skins with a foamed plastic core. The skins and core may be regarded as isotropic with the following the properties ... 

CO2 is much less volatile than CO (p. 306). It is a major industrial chemical but its uses, though occasionally chemical, more frequently depend on its properties as a refrigerant, as an inert atmosphere, or as a carbonating (gasifying) agent in drinks and foam plastic (see Panel). 

Mechanical Properties of Commercial Foamed Plastics. The properties of commercial rigid fuamed plastics are presented in Table 2. The properties of commercial flexible foamed plastics are presented in Table 3. 

TABLE 2. PHYSICAL PROPERTIES OF COMMERCIAL RIGID FOAMED PLASTICS... 

The properties of a foamed plastic can be related to several variables of composition and geometry often referred to as structural variables. These variables include polymer composition, density, cell structure (i.e., cell size, cell geometry, and the fraction of open cells), and gas composition. 

However, the syntactic materials with the lowest apparent densities are the carbonized foamed plastics. During the carbonization of these materials open pores are formed (see Fig. 9) which lead to a whole series of valuable properties such as strength, low heat conductivity, and controllable gas and water permeability (Table 15)39). 

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