Polyethylene/polypropylene blends

S.E. Barnes, E.C. Brown, M.G. Sibley, H.G.M. Edwards, I.J. Scowen and P.D. Coates, Vibrational spectroscopic and ultrasound analysis for in-process characterization of high-density polyethylene/polypropylene blends during melt extrusion, Appl. Spectrosc., 59, 611-619 (2005). 

Figure 8. IR spectra of polyethylene-polypropylene blend deposited on noncoated KCl surface and carbon-coated KCl surface with corresponding photomicrograph. The top half of the photo corresponds to the noncoated surface and the bottom half to the carbon-coated surface.

To investigate the contribution of evaporation rate on the deposit morphologies on germanium discs, an experiment was conducted at a low evaporation rate using a polyethylene-polypropylene blend on one... 

Dumoulin, M. M., and Utracki, L. A., Time-Temperature Superposition for Polyethylene/Polypropylene Blends, Chapter 8 in Rheology and Polymer Processing, A. A. Collyer and L. A. Utracki, Eds., Elsevier Appl. Sci., Barking, UK (1990). 

J. Zhao, M. Chen, X. Wang, X. Zhao, Z. Wang, Z.-M. Dang, L. Ma, G.-H. Hu, F. Chen, Triple shape memory effects of cross-linked polyethylene/polypropylene blends with cocontinuous architecture. ACS Appl. Mato. Intofaces 5, 5550-5556 (2013)... 

Ali, Z. L, Youssef, H. A., Said, H. M., Saleh, H. H., Influence of electron beam irradiation and polyfunctional monomer loading on the physico-chemical properties of polyethylene/polypropylene blends. Advances in Polymer Tehcnology 2006,25,208-217. 

Sirin, K. Balcan, M.(2010). Mechanical properties and thermal analysis of low-density polyethylene + polypropylene blends with dialkyl peroxide. Polymer Advanced Technology, vol.21, pp.250-255, ISSN 1099-1581. 

Li, C., Zhang, Y, and Zhang, Y. 2003. Melt grafting of maleic anhydride onto low-density polyethylene/polypropylene blends. Polymer Testing 22 191-195. 

Sawatari, C., Shimogiri, S., and Matsuo, M. 1987. Morphological properties of ultrahigh molecular weight polyethylene-polypropylene blend films produced by gelation/crystallization from solutions. Macromolecules 20 1033-1041. 

M.M. Dumoulin, L.A. Utracki, P.J. Carreau, Melt theology and morphology of linear low dcmsity polyethylene/polypropylene blends (Chap. 7), in Two Phase Polymer Systems, ed. by L.A. Utracki. Progress in Polymer Processing Series (Hanser, Munich, 1991), pp. 185-212 P.H.M. Elemans, Ph.D. thesis, Technische Universiteit Eindhoven, 1989... 

MartusceUi E. PraceUa M. Avella M. Greco R. Ragosta G. Properties of polyethylene-polypropylene blends—crystallization behavior. Makromolekulare Chemie-mac-rvmolecular chemistry and physics. 1980,181,957-967. 

Sun Oil Company, Improvements in or Relating to Polypropylene, Br. Pat. 952,089 (1964). Physical or thermoplastic IPN, crystalline/crystalline. Polyethylene/polypropylene blends. Very-high-molecular-weight polyethylene. High-impact strength. 

A ring ball apparatus has been used to determine a suitable tanperature range, that is, softening temperature, for the extrusion of low-density polyethylene and high-density polyethylene polypropylene blends [98] and polyphenylene sulfide-acrylonitrile-butadiene blends. 

Liu, G., Chen, Y., and Li, H. (2004). A study on sliding wear mechanism of ultrahigh molecular weight polyethylene/polypropylene blends. Ifear 256(11-12), 1088-1094. 

NIR techniques are also used for identity confirmation of fabricated products such as cap liners that are used in drinking bottles. Eilert [26] describes a method with ten liner types including polyethylene, polypropylene, polyester, and a polyethylene/polypropylene blend. Cluster models were successfully established to identify the material used in unknown cap liners. This model also included several materials that differed only in quality or grade. With the proper teaching set, the NIR qualitative method can be established to separate between different quality or grades of material. 

Other filler studies include the effect of lignin particles in poly-3-hydroxy butyrate [57], PS-clay composites [58], nanosilicon particles in polyethylene-polypropylene blends [59], montmorillonitrite in polyethylene oxide [60] and starch filled polypropylene [61]. 

Mourad, A.H., Akkad. R., Ahmad, S., and Tarek, M. (2009) Characterization of thermally treated and imtreated polyethylene-polypropylene blends. Macromol. Eng., 34 (1), 1-5. 

Mourad, A.H. (2010) Thermo-mechanical characteristics of thermally aged polyethylene/polypropylene blends. Mater. Des.. 31 (2), 918-929. 

Propylene content correlated with ratio Aj/Aj + A2 where Aj and A2 are absorbances at 8.62 and 13.89 pm - Measurement of propylene content in isotactic polyethylene - polypropylene blends [19]... 

A.-H.I. Mourad, R.O. Akkad, A.A. Soliman, T.M. Madkour, Characterization of thermally treated and untreated polyethylene-polypropylene blends using DSC, TGA and IR techniques, Plast. Rubber Compos. 38(7) (2009) 265-278. 

Yang M, Wang K, Ye L, Mai Y-W, Wu J. Low density polyethylene-polypropylene blends part 2— strengthening and toughening with copolymer. Blast Rubber Compos 2003 32(1) 27-31. 

Present work focuses on in-situ composites prepared by blending of high-density polyethylene with isotactic polypropylene using extrasion die with semihypetbohc-converging channel. Beside proper preparation of in-situ composites, interrelations between material composition, processing conditions and resulting stracture and properties of polyethylene-polypropylene blends are studied. 

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