Ethylene-1-pentene copolymer

Mw = 15-20 kg/mol) obtained by SEC from a whole, heterogeneous, metallocene-based ethylene-1-pentene copolymer (Afn = 7.6 kg/mol ... 

Fig. 6 Molecular mass distributions calculated from GPC and Fig. 9 Molecular mass distributions calculated from GPC and rheological data for a polypropylene-1-heptene copolymer rheological data for an ethylene-1-pentene copolymer...

Figure 10.4 C-NMR at 25.2 M Hz of (a) an ethylene-1-propene copolymer, (b) an ethylene-butene copolymer, (c) an ethylene-1-pentene copolymer, (d) an ethylene-1-hexene copolymer, (e) an ethylene-1-heptene copolymer and (f) an ethylene-l-octene copolymer. (Reprinted with permission from J.C. Randall, Journal of Polymer Science Polymer Physics Edition, 1973,11, 2, 275. 1973 John Wiley and Sons [19])...

PP or poly(pentene-co-propylene) was reactor blended with ethylene-butene, or ethylene-pentene, copolymer. The product was melt blended with PP for improved... 

Polypropylene, PP, or poly (pentene-co-propylene) was reactor blended with ethylene-butene or ethylene-pentene copolymer. The product was melt blended with PP to give material with improved performance. In the second patent, ethylene-propylene copolymer, EPR, was blended with PP. The alloys showed good mechanical properties. In the Sumitomo patent, to improve impact strength, PP was blended with 5-30 wt% of either polyhexene or polyoctene... 

Isomerization from the secondary to the more stable tertiary carbonium ion precedes reaction with the next molecule of monomer. A 1,3 polymerization has therefore occurred. Similarly, 4-methyl-l-pentene gives a 1,4 polymer (probably involving two successive 1,2 hydride shifts) that has a structure corresponding to an ethylene-isobutylene copolymer (Reaction 25). 

Phenylbenzofuran (282) was used to protect polyphenylene ether resins against damage from UV radiation <87USP4665ii2>. As a nucleating agent, benzofuran-2-carboxylic acid (283) was found to improve the properties of an ethylene/4-methyl-l-pentene copolymer <84JAP(K)59197446). 

Ethylene/4-metliyl-l-pentene copolymer n-heptane 1996LOO... 

EPDM (55 parts)/ethylene 4-methyl-1-pentene copolymer (20 parts)/PP (25 parts)A.130 RI (0.2 parts) + divinylbenzene (0.3 parts) TSE at 230 "CAensile and film properties vs. blend made without ethylene-methylpentene copolymer Yonekura et al. 1988 (see also Otawa et al. 1988)... 

It is important in some applications that the polymer does not embrittle outside a certain temperature range. Engineering plastics, which do not embrittle include LDPE, HDPE, PA, PTFE, ethylene-trifluoroethylene copolymer, fluorinated ethylene-propylene copolymer and silicones. PP, epoxy resins and polymethyl pentene are all subject to embrittlement. 

Figure 5.12 represents a compilation of melting temperature relations for rapidly crystallized ethylene copolymers with a set of 1-alkenes and norbomene as comonomers.(74-76,78) The melting temperatures of ethylene copolymers with bulkier side-group comonomers such as 1-decene, 4-methyl-1-pentene, cyclopen-tadiene and dicyclopentadiene follow the same curve as in Fig. 5.12.(78a) The plot clearly indicates that the melting points are independent of co-unit type under these crystallization conditions. Since observed melting temperatures of copolymers are known to depend on chain length the results shown have been limited to molecular weights of about 90000.(21) Studies of ethylene-octene copolymers with much higher comonomer content indicate a continuation of the curve shown in Fig. 5.12...

Figure 4.5 The i C-NMR spectrum of an ethylene-4-methyl pentene copolymer.

NMR spectroscopy has also been used to elucidate the composition of butane -ethylene - propylene [41], ethylene - butene-1 [42] and 4-methyl pentene-1-pentene copolymer [42, 43]. 

The commercial production of LLDPE relies on copolymetiza-tion with a-olefins such as 1-butene, 1-hexene, 1-oaene, and, to a smaller degree, 4-methyl-l-pentene. Prop ylene is not employed for LLDPE because the relatively small and sparse methyl groups of ethylene/propylene copolymers are accommodated in the crystal and are far inferior to butyl and hexyl groups (from 1-hexene and 1-octene, respertively) for the improvement of mechanical properties. Very long a-olefins, such as 1 -hexadecene, have been investigated for creating specialized LLDPE that shares properties with commercial LDPE made via free radical polymerization. ... 

Luruh N, Pijpers T, BruU R, et al Fractionation of ethylene/l-pentene copolymers using a combination of SEC-FTIR and SEC-HPer DSC, J Polym Sci Polym Phys 45(21) 2956-2965, 2007. 

Poly(methyl pentene), unfilled Low-density Medium-density High-density Ultra high-molecular-weight Glass-fiber- reinforced, high-density Ethylene-vinyl acetate copolymer... 

LLDPE can be produced with less than 300 psi and at about 100°C. It is actually a copolymer of ethylene with about 8% 10% of an alpha-olefin such as 1-butene, 1-pentene, 1-hexene, or 1-octene. Through control of the nature and amount of alpha-olefin, we are able to produce materials with densities and properties between those of LDPE and HDPE. LLDPE does not contain the long branches found in LDPE. 

Isomerization polymerizations can be associated with coordination catalyst systems, ionic catalyst systems, and free radical systems. The cationic isomerization polymerization of 4-methyl-1-pentene is of interest because the product can be viewed as an alternating copolymer of ethylene and isobutylene. This structure cannot be obtained by conventional... 

Ionic copolymers are composed from an a-olefin with an olefin content of 80 mol-% and an ethylenically unsaturated carboxylic acid (6). Suitable olefins include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, etc. 

Linear low-density polyethylene (LLDPE)440-442 is a copolymer of ethylene and a terminal alkene with improved physical properties as compared to LDPE. The practically most important copolymer is made with propylene, but 1-butene, 4-methyl-1-pentene, 1-hexene, and 1-octene are also employed.440 LLDPE is characterized by linear chains without long-chain branches. Short-chain branches result from the terminal alkene comonomer. Copolymer content and distribution as well as branch length introduced permit to control the properties of the copolymer formed. Improvement of certain physical properties (toughness, tensile strength, melt index, elongation characteristics) directly connected to the type of terminal alkene used can be achieved with copolymerization.442... 

Four olefins are used in industry to manufacture ethylene copolymers 1-butene, 1-hexene, 4-methyl-1-pentene. and 1-octene. Copolymers containing 1-butene account for approximately 40% of all LLDPE resins manufactured worldwide, 1-hexene copolymers for 35%, 1-octene copolymers for about 20%, and 4-mcthyl-l-pcntcnc copolymers for the rest. The type of o-olcliit exerts a significant influence oil tlie copolymer properties. 

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