Propylene Copolymers with Odd Carbon Number Olefins

Abstract

Preliminary investigation on propylene copolymers with odd carbon number olefin are reviewed. Additional experimental data presents propylene copolymers with 1‐heptene and 1‐nonene having higher impact strength and lower tensile strength values than copolymers of propylene and 1‐pentene.Thermoanalysis shows that the melting temperatures of the different copolymers decreases with increasing comonomer content. Slight changes were observed between the different propylene/1‐heptene copolymer melting and propylene/1‐pentene while the 1‐nonene copolymers show broadening of the melting curves as the comonomer content increases. It was highlighted that the source of novelty for these polymers is the comonomer type and content.

Microstructural details and polymorphs in poly(propylene‐ co ‐1‐nonene) copolymers synthesized at different polymerization temperatures

“…[ 33–36 ] However, the use of olefins with an odd number of carbons has been rather neglected. [ 37,38 ] It was found that the impact strength in different copolymers (1‐pentene, 1‐heptene, and 1‐nonene) is dependent, as expected, on comonomer content, but also on its length. Those incorporating 1‐nonene as counit show higher values of impact strength, at smaller comonomer compositions, than those exhibited by their homologues with 1‐pentene and 1‐heptene.…”

“…Moreover, it was also found in propylene copolymers that impact strength does not start increasing immediately, as observed for the ethylene copolymers, [39] but the rise is more gradual and follows an exponential increase with comonomer content. [38] More recently, the interest in the copolymers or terpolymers of propylene with 1-pentene or 1-heptene was concentrated primarily on the ability of developing the new trigonal crystalline lattice, as mentioned above, [19][20][21][22]27,28] but there are not systematic studies on microstructure and crystalline characteristics for copolymers with 1-nonene.…”

“…In order to find some added value and to look for future perspectives of polypropylene materials, the aim of this research is to get a deeper knowledge on copolymers of propylene and 1-nonene, based on some promising properties reported on literature. [38] Thus, their synthesis has been carried out by varying two very important polymerization characteristics: temperature and comonomer content.…”

Ethylene/1‐heptene copolymers as interesting alternatives to 1‐octene‐based LLDPE: Molecular structure and physical properties

“…1‐octene is the comonomer of choice in the manufacture of LLDPEs as it gives a mechanically better product as compared to other even‐numbered 1‐olefins. Considering the high demand of 1‐olefins for LLDPE production and the recently observed global shortage of 1‐octene, odd numbered Fischer‐Tropsch‐derived 1‐olefins such as 1‐pentene and 1‐heptene can be interesting alternatives to 1‐hexene and 1‐octene, respectively. Furthermore, the microstructures of LLDPEs made from the odd‐numbered 1‐olefins may be closely related to those made from even‐numbered 1‐olefins of comparable molar mass.…”

The existence of human TII B cells remains unproven: Comment on the article by Daridon et al

“…However, there are few works on ethylene‐1‐pentene and propylene‐1‐pentene copolymers and to our knowledge any work on ethylene‐propylene‐1‐pentene terpolymers. Ethylene‐1‐pentene copolymers have been studied concerning their chemical distribution14 and thermal, crystallization, and reological properties15 and propylene‐1‐pentene random copolymers having high impact strength, good tensile and reological properties, excellent optical properties and a large processing window have been prepared 16. The 13 C NMR spectroscopy is the most successful analytical tool to study molecular structure of polymers and allows researchers to obtain comonomer sequences, short‐chain and long‐chain branch distributions, and quantitative analyses of the composition 17, 18.…”