Effects of different molecular architectures in terms of comonomer content and composition distribution on the miscibility of cyclic olefin copolymer/polyolefin (COC/POE and COC/LLDPEB) blends

Shamsoddini-Zarch, Fatemeh; Karrabi, Mohammad; Jahani, Yousef

doi:10.1007/s13726-021-00914-z

Cited by 3 publications

(1 citation statement)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the molecular catalysis, the precision and flexibility of the molecular design is benefited to propel a desired function 1–3 . Heterogeneous solid catalysts demonstrate multidimensional characteristics, which helps the material scientist to achieve especial performance by proper controlling the integration of multiple properties entities 4–6 . In order to incorporate various functions into a single material, the design should have multidimensional character.…”

Section: Introductionmentioning

confidence: 99%

Effect of adduct synthesis parameters on the ethylene polymerization kinetics of Ziegler Natta catalysts

Nouri-Ahangarani

Bahri‐Laleh

Abedini

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

Here, it is aimed to clarify the structure-performance relationship in MgCl 2 based Ziegler Natta catalysts toward ethylene polymerizations. In this regard, 11 different adduct precursors were prepared through industrially appreciated melt quenching method employing various: (i) reaction times for dissolving magnesium chloride inside ethanol; (ii) ethanol/MgCl 2 molar ratios in the feed; (iii) heating rates during thermal dealcoholation; (iv) N 2 flows during thermal dealcoholation and (v) alcohol content after thermal dealcoholation. Among the studied parameters, heating rate and N 2 flow during thermal dealcoholation have the most pronounced effect on the porosity and particle size of the resulted adducts. Related Ziegler Natta catalysts were subsequently employed in ethylene polymerizations. According to the kinetic curves, catalyst productivity and form of kinetic curve (as decay or build-up type) can be precisely tailored by proper choosing of the mentioned variables during adduct synthesis. Microstructure analysis of the prepared polyethylenes reveals that alcohol content in the final adduct has the most significant effect on the H 2 response, in terms of molar mass and its distribution, of the related Ziegler Natta catalysts. The overall results help polyethylene producers in choosing proper reaction conditions during adduct synthesis for the production of different polymer grades, when productivity or H 2 response is targeted.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of adduct synthesis parameters on the ethylene polymerization kinetics of Ziegler Natta catalysts

Nouri-Ahangarani

Bahri‐Laleh

Abedini

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

Preparation the composite with high toughness and strength by recycled cyclic olefin copolymer

Ming

Liu

et al. 2022

Polymer Engineering & Sci

View full text Add to dashboard Cite

At present, it is of great significance to develop an effective method of recycling cyclic olefin copolymers (rCOC) due to its increasing application. But, its poor toughness is still an important difficulty to limit its effective recycling. In this article, we introduced PA6 into the POE-g-MAH/rCOC composites. Because of the good compatibility of POE-g-MAH between PA6 and rCOC, it just led to an overall improvement in mechanical properties of PA6/POE-g-MAH/rCOC (45/15/40) composites. Its tensile strength reached 42.3 MPa, which was more than 41.9% compared with that of POE-g-MAH/rCOC composites. Its notched impact strength was 11.7 kJ/m 2 , which was higher than 875.0% compared with rCOC. Furthermore, the component of PA6 was wrapped by nonpolar rCOC and POE-g-MAH, resulting in a low water absorption rate (1.0%). So, the strength of the composites only dropped a little after water adsorption. In summary, the addition of PA6 helped the composites effectively utilize the toughness of POE-g-MAH. Thus, we developed an easy method to recycle rCOC and prepare the responding composites with high strength and toughness.compatibility, PA6, POE-g-MAH, recycled cycloolefin copolymer, toughening | INTRODUCTIONCyclic olefin copolymers (COCs) are amorphous transparent material prepared by metallocene polymerization with norbornene or its derivatives and ethylene. [1][2][3][4][5] Compared with traditional transparency plastics such as polycarbonate (PC) and polymethyl methacrylate (PMMA), COC resin has been widely used in high-end lenses, medical equipment, [6] and pharmaceutical packaging [7] due to its high water vapor barrier rate, [8,9] good chemical resistance, [10] and high biocompatibility. [11] But, due to the high requirements for materials in the optical field and pharmaceutical field, recycled COC resin is not permitted to employ again. Thus, the recycling of this stable COC resin becomes more and more urgent. However, the poor toughness of rCOC has greatly limited

show abstract

Effects of processing conditions on the phase morphology and mechanical properties of highly toughened polypropylene/polybutylene terephthalate (PP/PBT) blends

2021

View full text Add to dashboard Cite

Effects of different molecular architectures in terms of comonomer content and composition distribution on the miscibility of cyclic olefin copolymer/polyolefin (COC/POE and COC/LLDPEB) blends

Cited by 3 publications

References 59 publications

Effect of adduct synthesis parameters on the ethylene polymerization kinetics of Ziegler Natta catalysts

Effect of adduct synthesis parameters on the ethylene polymerization kinetics of Ziegler Natta catalysts

Preparation the composite with high toughness and strength by recycled cyclic olefin copolymer

Effects of processing conditions on the phase morphology and mechanical properties of highly toughened polypropylene/polybutylene terephthalate (PP/PBT) blends

Contact Info

Product

Resources

About