Preparation of ultrahigh molecular weight ethylene/1-octene block copolymers using ethylene pressure pulse feeding policies

Liu, Weifeng; Ojo, Andrew Toye; Wang, Wenjun; Fan, Hong; Li, Bo‐Geng; Zhu, Shiping

doi:10.1039/c5py00380f

Cited by 17 publications

(16 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figures and show DSC thermograms (second heating) for blends extruded at 100 °C and 160 °C, respectively. The neat polymers both exhibit broad melting peaks characteristic for the high vinyl acetate content of the EVA and the low‐density ethylene–octene copolymer, respectively. Separate melting points for the EVA and EO‐phases as well as the absence of a significant shift in melting temperature are observed in the blends.…”

Section: Resultsmentioning

confidence: 76%

Blends of photovoltaic‐grade ethylene–vinylacetate copolymers and low‐density ethylene–octene copolymers, their morphology and their thermal, mechanical, and rheological properties

Ehrich

Schulze

Ramezani

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

Blends of photovoltaic‐grade ethylene–vinyl acetate copolymer (EVA), defined by high VA‐content and low crystallinity, and low‐density ethylene–octene copolymer (EO) have been investigated with regard to their processing, thermal and mechanical properties as well as their morphology. It was found that the amount of EO in the blend has a strong influence on the shear thinning behavior, melt viscosity and therefore the required extrusion temperature and resulting ability to incorporate temperature‐sensitive additives like a peroxidic crosslinking agent. A phase separated morphology was found for all blend compositions, though partial miscibility leading to co‐crystallization was observed for EVA rich blends. EO rich blends show lower glass transition and higher melting point compared to neat EVA and exhibit higher elastic modulus at elevated temperatures as well as greater elongation at break during tensile testing while the light transmission is diminished. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47714.

show abstract

Section: Resultsmentioning

confidence: 76%

Blends of photovoltaic‐grade ethylene–vinylacetate copolymers and low‐density ethylene–octene copolymers, their morphology and their thermal, mechanical, and rheological properties

Ehrich

Schulze

Ramezani

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Well‐defined POs with complex architectures (block, graft, star, etc.) were synthesized using “living” olefin polymerization techniques . Coates and co‐workers reported the synthesis of comb POs ( M n = 74–209 kg mol −1 , PDI = 1.51–1.90) via the ‘living” polymerization of poly(ethylene‐co‐propylene) macromonomers catalyzed by a nickel/α‐diimine catalyst.…”

Section: Preparation Of Long‐chain‐branched Pos With “Living” Polymermentioning

confidence: 99%

A Comprehensive Review on Controlled Synthesis of Long-Chain-Branched Polyolefins: Part 2, Multiple Catalyst Systems and Prepolymer Modification

Liu

Wang

et al. 2016

Macromol. React. Eng.

Self Cite

View full text Add to dashboard Cite

Long-chain branching plays an important role in the performance of polyolefi ns (POs). The existence of a very small amount of long-chain branches (LCBs), i.e., <1 per 10 000 carbons, can signifi cantly improve processability of the polyolefi n materials, which is highly desired for those intractable polyolefi ns with narrow molecular weight distribution and high degree of crystallinity. Numerous literatures have been published on the controlled synthesis of long-chain-branched POs. In the previous paper, the major literatures of single catalyst systems have been summarized. This paper provides a comprehensive review for the binary and multiple catalyst systems and a brief summary of some other methods for the controlled synthesis of long-chainbranched POs. The controllability of long-chain-branched structures in the various preparation procedures with single or two reactor systems, and in one or two-step processes, is analyzed and compared in-depth. world polymer market. In the recent years, shortage in the fossil fuel resources has powerfully stimulated the technological innovation and improvement of the PO industry, as the monomers such as ethylene and propylene are originally based on nonrenewable crude oil refi ning. A Comprehensive Review on ControlledPOs are widely used in various application areas due to their good physical and mechanical properties, superior processability, good chemical and environmental resistance, good recyclability, and low costs. The good performance of PO materials intrinsically depends on its chain microstructure, [ 1,2 ] which includes three major aspects: molecular weight (MW) and molecular weight distribution (MWD), short-chain branching, and long-chain branching. Therefore, the tailor design of PO materials requires at least good control of these three basic structure elements.(1) Control of MWs and MWDs : POs with a narrow MWD have less solvent-extractable components, i.e., those

show abstract

“…The structure data was listed in Table 2. The detailed synthesis and structure analysis of these living block copolymers could be found in our previous work [29]. …”

Section: Uniaxial Tensile Properties Of Block Copolymersmentioning

confidence: 99%

“…Schematic structures of the living block copolymers. [29] Figure 6 shows the stress-strain curves of the block copolymers. All the samples gave uniform deformation, without typical yielding and necking during the stretch.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Elastomeric properties of ethylene/1-octene random and block copolymers synthesized from living coordination polymerization

Liu

Zhang

et al. 2015

Polymer

Self Cite

View full text Add to dashboard Cite

Preparation of ultrahigh molecular weight ethylene/1-octene block copolymers using ethylene pressure pulse feeding policies

Abstract: Ultrahigh molecular weight ethylene/1-octene block copolymers were prepared from ethylene pressure pulse feeding policies in living coordination polymerization.

Cited by 17 publications

References 25 publications

Blends of photovoltaic‐grade ethylene–vinylacetate copolymers and low‐density ethylene–octene copolymers, their morphology and their thermal, mechanical, and rheological properties

Blends of photovoltaic‐grade ethylene–vinylacetate copolymers and low‐density ethylene–octene copolymers, their morphology and their thermal, mechanical, and rheological properties

A Comprehensive Review on Controlled Synthesis of Long-Chain-Branched Polyolefins: Part 2, Multiple Catalyst Systems and Prepolymer Modification

Elastomeric properties of ethylene/1-octene random and block copolymers synthesized from living coordination polymerization

Contact Info

Product

Resources

About