Strength fabric tear

CeUulose phosphate esters are also produced by treatment with sodium hexametaphosphate [14550-21-1] by the pad-dry-cure technique. These treated fabrics have high retention of breakiag and tearing strength (61). The reaction products contain more than 1.6% phosphoms and are iasoluble ia cupriethylenediamine [15243-01 -3] iadicating that some ceUulose cross-linking occurs. However, siace durable-press (DP) levels and wrinkle recovery values are low, it seems reasonable that only limited cross-linking takes place. 

Combination Flame Retardant—Durable Press Performance. Systems using THPC, urea, and TMM can be formulated to give fabrics which combine both flame-retardant performance and increased wrinkle recovery values (80). Another system employs dimethylol cyanoguanidine with THPC under acidic conditions (115). Both of these systems lead to substantial losses in fabric tensile and tearing strength. 

Other reinforcements that may be used in the substrate layers of decorative laminates and throughout the stmcture of industrial laminates are woven fabrics of glass or canvas and nonwoven fabrics of various polymeric monofilaments such as polyester, nylon, or carbon fibers. Woven and nonwoven fabrics tend to be much stronger than paper and have much more uniform strength throughout the x—y plane. They greatly enhance properties of laminates such as impact and tear strength. 

Cured sihcone LIM mbber can be fabricated with physical properties equivalent to heat-cured mbber (385). Shore A hardness can range from 30 to 70, depending on formulations. Typical physical properties include tensile strengths as high as 9.7 MPa (1400 psi), 500—775% elongation at break, and tear strength of >30 N/mm (180 Ib/in.). Compression sets of less than 10% can be achieved if the material is baked after processing. 

Silicones. SUicones are exceeded only by fluorochemicals in the volume used as repeUents for textiles. They are widely used on ceUulosic and synthetic fiber fabrics. SUicones provide water-based stain resistance good durabUity to washing improved tear strength a soft, sUck hand and improved fabric sewabUity. 

The oxidation of the film follows first-order kinetics with rates close to those found for decreases in tear strength and depolymerization of cotton and rayon fabrics. The reaction mechanisms appear not to be affected by temperature. The infrared spectra of the film and of the water extract of the aged film are essentially the same as those found for naturally aged linen. 

Rhoplex K-3 was also applied in combination with 1.2% polyethylene (Moropol 700, supplied by Mortex Chemical Products), a material that lubricates the surfaces of the yarns, gives the fabric more flexibility, and increases the tearing strength of resin-treated wash and wear fabrics (4). A second sample of Rhoplex K-3 with 1.2% polyethylene added was air dried instead of oven dried to assess the influence of different drying methods. 

Figure 2. The tearing strength of degraded cotton print cloth (50-Mrad dose) after application of various acrylic resins (A1-A4) and grafted monomers (M1-M4J U = untreated fabric, PE = polyethylene, AD = air dried. See text for identification of resins and monomers.

The results of the monomer applications are given in Table II and Figures 1-6. None of these treatments shows much promise since all tensile and tear strengths are below that of the untreated degraded fabrics. No significant change in fabric stiffness occurs. 

The results of these six experiments, reported in Table II, show that all tensile strengths are decreased and that there is little change in fabric stiffness. The tearing strength increases slightly in all cases (except for... 

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