Tensile strength phthalate

DiaHyl phthalate copolymerizes at 80°C with peroxide catalyst and small amounts of long chain vinyl monomers including vinyl laurate, dioctyl fumarate, lauryl methacrylate, and stearyl methacrylate (43). The products show increased elongations but reduced tensile strengths. 

Nandanan et al. [35] reported the utilization of linseed oil as an MFA in nitrile rubber vulcanizates. Linseed oil not only acted as a plasticizer but also as the fatty acid component of the activator in the NBR vulcanizates. Use of linseed oil gave appreciable increase in properties like tensile strength, tear resistance, etc. while the viscosity of the compound was marginally lower than that of the control compound (which used di-octyl phthalate as the plasticizer). The vulcanizates containing linseed oil also exhibited increased cure rate as well as reduced leachability compared to the control at a dosage of 2-5 phr. This loading was seen to replace 6 phr DOP and 2 phr stearic acid in conventional NBR vulcanizates thereby reducing compound costs. 

Adding plasticizer, like dioctyl phthalate, is generally accomplished by mechanical methods. Permanent or chemical plasticization can be done by copolymerization of VCM with monomers such as vinyl acetate, vinylidene chloride, methyl acrylate, or methyl rhethacrylate. Comonomer levels vary from 5-40%. The purpose of the co-polymers, of course, is to change the properties such as softening point, thermal stability, flexibility, tensile strength, and solubility. 

When irradiating a 1 1 blend of polychloroprene and poly (butadiene-acrylonitrile) (NBR) reinforced by 50 phr furnace black and containing 5-15 phr of tetra methacrylate of bisglycerol phthalate, it exhibited a tensile strength of 20 MPa (2900 psi) at a dose of 15 Mrad (150 kGy) with values of elongation at break in the range 420 to 480%. These values are equal to or better than those obtained from similar compounds cured chemically.199... 

Figure 11 indicates the differences between three different chemical types of plasticizers. A comparison has been made between a commercial trixylyl phosphate (TXP), diisooctyl phthalate (DiOP) and diisooctyl sebacate (DiOS). It is apparent that all three points increase from TXP to DiOP to DiOS. The DiOS is at 50 p.h.r. since at 75 p.h.r. the film would be very low in tensile strength. 

Figure 13. Tensile strength/temperature curves for phthalate plasticizers of different molecular weight...

An inert polymer matrix, such as PVC, embedding MIP particles has been used for devising a potentiometric chemosensor for MPA [150]. These particles were prepared by thermo-radical polymerization using MAA, EGDMA and AIBN as the functional monomer, cross-linker and initiator, respectively, in a chloroform-(carbon tetrachloride) solution. For immobilization of the MIP particles on the electrode surface, dioctyl phthalate or 2-nitrophenyloctylether was used as the PVC film plasticizer in order to add tensile strength to the matrix. LOD of the chemosensor fabricated that way was appreciably lower than those of the other MIP chemosensors for MPA [181] and equal to 0.05 pM MPA [150]. 

Ester type Dibutyl phthalate, % Elongation, % Tensile strength, MPa... 

Details are given of the preparation of PVC membranes containing dialkylphthalate. The tensile strength and percent elongation of these membranes as a function of concentration of the phthalate plasticisers, their size and ageing period were performed. Applications in the controlled release of agrochemicals are mentioned. 19 refs. 

Plasticizers have a marked effect on T. One would normally expect that the plasticized polymer would nave a lower strength, hardness, and modulus than the unplasticized material. Actually incorporation of small amounts of a plasticizer such as di(2-ethylhexyl) phthalate (OOP) causes an increase in these values. At the 10-15% level of plasticizer. X-ray diffraction studies and IR analyses show an increase in the amount of crystallinity, probably due to an ordering of polymer chains. This result is the so-called "anti-plasticizer effect" and is dependent on the type of plasticizer. As the amount of plasticizer is increased, however, these properties (tensile strength and modulus) do decrease as shown in Figure 17. The effect on T as a result of increasing levels of DOP plasticizer is shown in Frgure 18. 

Two plasticizers (di-(2-ethylhexyl) phthalate and epoxidized soya bean oil) were used in the range of concentrations from 0 to 50 phr. Tensile strength of both plastifieates was very similar and almost linearly decreased with the increase in plasticizer concentration. 

Urethane polymers with variable urethane contents were plasticized with 10% dibutyl phthalate. Tensile strength of both plasticized and unplasticized polynrethanes increases with urethane content. Addition of the plasticizer always reduces tensile strength but the reduction is substantially larger for higher concentrations of urethanes (e g., 25,34, and 45% tensile strength reduction for 46,50, 53% urethane content respectively). 

Diallyl phthalate 70 10.6 0.9 N/A 0.41 Tensile strength, flexural modulus, notched Izod, detergent resistance, heat distortion temperature, tracking resistance, and UV radiation Volume resistance, dielectric strength, dissipation factor flammability, hydrolytic stability, high cost and elongation break... 

Mechanical and processing properties of blends of poly(viityl chloride) (PVC) with di-isodecyl phthalate (DIDP) and thermoplastic polyurethane (TPU) were compared with di-2-ethylhexyl phthalate (DOP). The influence of processing conditions on the mechanical properties was studied by changing the content of the additives and using different twin screw speeds. The mechanical properties (tensile strength, modulus, and energy) of PVC/DIDP presented the same behavior as PVC/DOP at all... 

The metal-containing oligomers (NN 22) are the derivatives of the aromatic organic acids. These compounds were synthesized by the interaction of some metal oxides with mono-2-hydroxyethyl phthalate (Table 3, NN 33). The introduction of these metal-containing oligomers in the epoxy compositions was conducted by dissolving them in dimethyl acetamide [412,414-417]. The produced polymers had a tensile strength of 90 MPa and a breakdown temperature of 190°C [412,414-416]. 

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