Tensile properties of polyethylene

Osman, M. A., Rupp, J. E. R, and Suter, U. W. 2005. Tensile properties of polyethylene-layered silicate nanocomposites. Polymer 46 1653-1660. 

The tensile properties of polyethylene composites were improved and it was observed an increase in the hydropho-bicity of the fibre [133]. 

Good models are needed because information on important properties such as heat capacity and elastic modulus can be derived from the force constants, The elastic modulus data is particularly useful since it allows the ultimate tensile strength of polyethylene to be determined. Based on present estimates of this, it is apparent that it is still possible to improve existing materials. 

Some physical properties of polyethylene ionomers are compared with those of polyethylene and the acid copolymer, poly(ethylene-co-methacrylic acid) in Table 5.15. lonomer is generally tougher and, as shown in Table 5.15, relative to the acid copolymer, its tensile strength is increased by 27—53% and its stiffness is nearly tripled. 

The last system that will be compared is that of polystyrene and polyethylene. In these studies,35the tensile properties of the blend with an added copolymer were examined. These studies showed that the addition of 10% diblock copolymer (50/50 composition, Mw = 80,000) to a blend that is 80% polystyrene produces an ultimate strength of 33 MPa, whereas the addition of the same amount of a random copolymer (67% polyethylene, Mw =... 

Kalaprasad, G. Francis, Bejoy Thomas, Selvin Kumar, C. Radhesh Pavithran, C. Groeninckx, G. Thomas, Sabu, Effect of fibre length and chemical modifications on the tensile properties of intimately mixed short sisal/glass hybrid fibre reinforced low density polyethylene composites. Polymer Intenuitional, 53(11), 1624—1638 (2004). 

A.W.M. Kahar, H. Ismail, N. Othman. Effects of polyethylene-grafted maleic anhydride as a compatibilizer on the morphology and tensile properties of (thermoplastic tapioca starch)/ (high-density polyethylene)/(natural rubber) blends... 

Table 12 Tensile properties of the polyethylene-clay nanocomposite and related samples (n = 5). The values in parentheses are the relative values of the nanocomposites and PECC ...

Tensile strength measurements were made for untreated and phosphonylated polyethylene films in order to ensure that the bulk tensile properties of the treated polymer were not affected by the surface modiHcation. Twenty samples of both treated and untreated films were pulled until failure. The average ultimate tensile strength for untreated polyethylene was 2,437 psi with a standard deviation of 308 and the average for the treated fflms was 2,339 psi with a standart deviation of 729. A student s t-test revealed no statistically significant difference in the tensile strength between the two polymers. This tensile data, coupled with the percentage of die material affected by the surface treatment as calculate from ESCA data confirms that the material modification was limited to the material surface and did not penetrate the bulk of the material. 

Liang JZ, Li RKY, Tjong SC. Morphology and tensile properties of glass bead filled low density polyethylene composites material properties. Polymer Test 1998 16 (6) 529-548. 

Meenakumari B, Ravindran K. Tensile strength properties of polyethylene netting twines under exposure to out-door and artificial UV radiation. Fish Technol 1985a 22 82-86. 

As much as 30% of all polyolefin products involve blends (Robeson 2007). It has been found, for example, that blending metallocene-catalyzed linear low-density polyethylenes (mLDPEs) with HDPE improves the Izod impact strength and some tensile properties of HDPE. Adding mLLDPE to LDPE increases the ductility of LDPE (Cran and Bigger 2009). In general, PE blends can be divided into three categories (1) PE lots blended to meet standard specifications for density and melt flow, (2) PE modified with <15 wt% of other polymer(s), and (3) PE bends with other thermoplastics or thermoplastic elastomers. 

Joseph K, Thomas S, Pavithran C et al (1993) Tensile properties of short sisal fiber-reinforced polyethylene composites. J Appl Polym Sci 47 1731-1739... 

Kuruvilla J, Sabu C, Pavithran C (1996) Effect of chemical treatment on the tensile properties of short sisal fibre-reinforced polyethylene composites. Polymer 37 5139-5149 George J et al (1996) Melt rheological behaviour of short pineapple fibre reinforced low density polyethylene composites. Polymer 37 5421-5431... 

Effects of various chemical treatments such as sodium hydroxide, isocyanate, permanganate, and peroxide on the tensile properties of sisal fiber-reinforced low-density polyethylene (LDPE) composites were investigated. Sodium hydroxide treated fiber composites showed better tensile properties than xmtreated composites, and the enhancement was attributed to their rough surface topography and increased aspect ratio. It was reported that long chain structured cardanol derivative of toluene diisocyanate (CTDIC) treatment reduces the hydrophilic nature of the sisal fiber resulting in improved compatibility and dispersion. It was also reported that peroxide treatment of fiber showed maximum interfacial interactions [33]. 

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