Polyethylene blends, binary linear

Later work on binary linear polyethylene blends reported by Rego Lopez and Gedde [115], Rego Lopez et al. [156] and Conde Brana et al. [157] provided a somewhat different view. The blends studied were based on the combination of a low molar mass linear polyethylene (Mw=2500 g mol-1 MwIMn= 1.1) with one of a series of higher molar mass linear polyethylenes (11,000Different types of crystallisation were observed in the binary linear polyethylene blends [156] ... 

N. Mieda, M. Yamaguchi, Flow instability for binary blends of linear polyethylene and long-chain branched polyethylene. J. Nonnewton. Fluid Mech. 166, 231-240 (2011)... 

Figure 8.32 Schematic melting thermogram of a binary linear polyethylene blend. Drawn after data presented by Rego-Lopez ei al (1988).

Fig. 11.23 (a) Plot of crystallization half-time, ti/2, against percent M = 9000 for binary blends of linear polyethylene molecular weight fractions. Pure components M = 9000and370000.Crystallizationtemperature 130°C Ol29°C Dl27°C. (b) Plot of crystallization half-time, ti/2, against percent M = 26000 for binary blends of linear polyethylene. Pure components M = 26000 and 3.8 x 10 . Crystallization temperature 130°C o 128 °C. (From Ohno (37))... 

A key factor in governing the extent of co-crystallization in binary polyethylene blends is the closeness of the crystallization rates of each of the components.(50-52) The difference in rate diminishes with increasing concentration of the linear component in the blend. The amount of co-crystallization is favored by lower isothermal crystallization and is maximized by rapid, quenched crystallization conditions. Blend composition and molecular structure of the components also have an influence on co-crystallization. The different results that can be obtained for different modes of crystallization have important implications for the morphology and properties in the solid state. Therefore, to gain further insight it should be fruitful to examine and analyze the crystallization kinetics of such blends in more detail. ... 

The morphology and crystallisation behaviour of a series of binary blends based on a low molar mass linear polyethylene (Mw=2500 g mol-1 Mw/Mn= 1.1) and two higher molar mass branched polyethylenes... 

The 80%/20% binary blends PE/PS and PP/PS were subjected to F-C reaction for compatibilization performed under nitrogen atmosphere in a Banbury mixer. Different concentrations of catalyst (AICI3) and 0.3% of cocatalyst (styrene) were added to the completely melted and mixed physical blends. The blends and catalyst concentrations are weight based. High MW commercial grades of linear low density polyethylene (LLDPE), and injection-grade polypropylene and polystyrene were used as homopolymers. The compatibilization conditions and MW of the homopolymers are given in Table 20.1. Blend names are listed in nomenclature. 

J. K. Keum, Y. Mao, F. Zuo, B.S. Hsiao, Flow-induced crystallization precursor stmcture in high molecular weight isotactic polypropylene (HMW-iPP)/low molecular weight linear low density polyethylene (LMW-LLDPE) binary blends. Polymer 54, 1425-1431 (2013)... 

K. Cho, T.-K. Ahn, B.H. Lee, S. Chor, Miscibility and processability in linear low density polyethylene and ethylene-propylene-butene-1 terpolymer binary blends. J. Appl. Polym. Sci. 63, 1265-1274 (1997)... 

M.J. Hill, Liquid-liquid phase separation in binary blends of a branched polyethylene with linear polyethylenes of differing molecular weight. Polymer 35(9), 1991-1993 (1994)... 

Figure 7.45 Mass crystallinity of binary blends of two linear polyethylenes (L2.5 = 2500, M /M = 1.15 ...

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