Polyolefine properties

Jabarin, S.A., Kollen, W.J., Polyolefin Properties for Rigid Food Packaging. Polymer Engineering and Science, 1988,28(18) 1156-1161. 

Polyolefins. Properties of LLDPE/LDPE blends have been described in several publications [Utracki and Schlund, 1986 1987 Schlund and Utracki, 1987 Zahavich and Vlachopoulos, 1997]. Blends of LLDPE with PP were also studied [Dumoulin et al., 1987 1988 1991 Dumoulin and Utracki, 1990]. Similarly blends of PE with PC were described [Utracki and Sammut, 1989 1990b]. The polyolefin blends have been reviewed [Utracki, 1989 a, b Hamid and Atiqullah, 1995 Utracki, 1998]. 

Expanding the Polyolefin Property Envelope From Spheripol to... 

EXPANDING THE POLYOLEFIN PROPERTY ENVELOPE FROM SPHERIPOL TO SPHERILENE TECHNOLOGY... 

CATALLOY, SPHERILENE and HIV ALLOY processes are successful examples how innovative research and development are expanding the polyolefin property envelope. 

The polyolefin life trajectory is also called ageing, the term that is preferred if the long-term changes of polyolefin properties due to weathering come into the play. It may involve the participation of physical processes such as recrystallization, loss of stabilizers by bleaching and mechanically initiated embrittlement. In the older literature, the reader may encounter also the term corrosion that was implemented from metals. 

Uses High gloss vehicle for overprint varnishes on paper, paperboard, and foil, for use in industrial and plastic coatings Features Exc. clarity and adhesion to treated polyolefins Properties Translucent emulsion dens. 8.6 Ib/gal vise. 200 cps pH 7.8 hardness (Konig) 35 48% NV by wt. 

Chem. Descrip. High purity Montana talc Chem. Analysis SIO (60%), MgO (33%), AljOs (1%), moisture (0.5%) CAS 14807-96-6 EINECS/ELINCS 238-877-9 Uses Filler for solv.- and water-based paInts/coatIngs, semigloss paints, OEM/speclalty areas, rigid vinyl, and polyolefins Properties Powd. 0.8 p median particle size fineness (Hegman) 6.5 sp.gr. 2.8 dens. 22 Ib/ft (tapped) bulk dens. 6.4 Ib/frf bulking value... 

Despite their versatility, both polyethylene and polypropylene are made only of carbon and hydrogen atoms. We are so used to these remarkable plastics that we do not often stop to ask how materials made out of such simple building blocks can have this extraordinary range of properties and applications. The answer to this question lies on how the carbon and hydrogen atoms are connected to define the molecular architecture or microstructure of polyolefins. Because microstructure plays such a relevant role in polyolefin properties, several characterization techniques have been specifically developed to measure different aspects of their molecular architectures. Section 2.1 classifies the different types of commercial polyolefins according to their microstructures, discusses several microstructural characterization techniques developed for these polymers, and demonstrates how they are essential to understand polyolefins. 

Besides being used to understand complex microstructiual distributions, cross-fractionation can also be used for sample preparation. Before singlesite-type catalysts were commonly available, it was extremely difficult to study the independent effect of molecular weight or comonomer composition on polyolefin properties, because polyolefins produced with Ziegler-... 

The hydrogenation of cis-1,4 copolymers of B and I would lead to polyolefins with composition and sequence distribution consisting of ethylene (E) blocks and alternating ethylene/propylene (E/P) blocks. These novel polyolefins are difficult or almost impossible to obtain directly by simple polymerization of E and P monomers using any existing polymerization catalysts. Since structural variations in these polyolefins, such as composition aind monomer sequence distribution, would significantly affect the polyolefin properties, the hydrogenated cis-1,4 B/I copolymers with uniformly random distribution of E and E/P imits may serve as model polymers to study structure-property relationships and be useful as polymers with unique properties. 

Ruff M, Paulik C (2013) Controlling polyolefin properties by in-reactor blending 2. particle design. Macromol React Eng 7 71-83... 

Investigations of polyolefin properties began more than a century ago. Polymethylene, or linear polyethylene. 

Some limiting properties (and polyolefin properties) are zero or approximately zero, e.g., dipole moments, vapor pressures, fluidity, iodine numbers, saponification values, acid strength, functional groups, and water solubility. 

Hundreds of test methods referring to polyolefin properties are actually employed. They consist of both physical (hardness, stiffness, tensile properties, solubility, viscosity, etc.) and chemical (acetone extractable, carbonyl content, etc.) tests, representing the objects of international, national, or industrial standards and specifications. Some of them, elaborated by ASTM Committee D-20, Subcommittee XII, Polyolefin Plastics, are indicated in Table 1. 

Molecular management of polyolefin properties requires advanced analytical technology that can provide detailed compositional and microstructural information of the polyolefin product. In principle, structural information can be obtained by breaking the polymer into short sequences, which are then analysed. Indeed, Py-MS has been used for many years to characterise polymers in this manner [4-7]. However, chemical information can be lost if the pyrolysates undergo additional fragmentation when they are ionised, which is often the case with polyolefins. 

Ziegler-Nai ta catalyst development did not stop with the introduction of the high yield, high isotactic third generation catalyst process. The supersetive catalyst has provided the basis for a versatility in product and process development never previously thought possible. This system meets the four major objectives vital for the control of polyolefin properties. 

Uses Emulsifier, lubricant for hair rinses hand modifier for textiles spreading agent in paste waxes and polishes antistat and emulsifier for SR and polyolefins Properties Off-wh. waxy flake sp.gr. 0.94 m.p. 41-43 C Alrowet D-65 [Ciba Spec. Chems./Plastic Addit.j Chem. Descrip. Dioctyl sodium sulfosuccinate ionic Nature Anionic... 

---