High crystallinity polyethylene obtained in biphasic polymerization using pyridinium chloroaluminate ionic liquid

Ochędzan‐Siodłak, Wioletta; Dziubek, Katarzyna; Czaja, Krystyna; Rabiej, Stanisław; Szatanik, R.

doi:10.1007/s10965-014-0558-5

Cited by 8 publications

(9 citation statements)

References 45 publications

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“…The changes of the values of χ DSC − 2 and χ WAXS − α for PP/S4SQ composites demonstrate almost the same tendency. Some slight differences between them may be caused by sensitivity and specificity of each method which was already described elsewhere .…”

Section: Resultsmentioning

confidence: 99%

Functionalized siloxane‐silsesquioxane resins and polypropylene‐based composites: Morphological, structural, thermal, and mechanical properties

et al. 2018

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Non‐functionalized and n‐alkyl‐functionalized siloxane‐silsesquioxane resins (S4SQ) were synthesized and characterized to confirm their structure and properties. Polypropylene (PP) composites with S4SQ resins as fillers were prepared by the melt blending. The influence of the kinds and amounts of fillers on the structural, morphological and thermal properties as well as mechanical characteristics and processability was determined. High compatibility of composites with functionalized resins resulted in more homogenous dispersion of filler particles in comparison with the composites which contained a non‐functionalized resin. Moreover, the introduction of S4SQ resins into PP strongly affected the crystalline structure of the polymer matrix and the free‐volume properties of composites. Siloxane‐silsesquioxane resins changed the contributions of the α‐ and β‐crystalline phases and they increased the crystal sizes of PP. The PP/S4SQ composites were also characterized by the improved crystallization temperature and crystallinity degree while the melting temperature and processability were changed only slightly. The mechanical properties of the PP/S4SQ materials were found to be dependent mostly on the degree of filler dispersion and crystalline structure of the composite materials. POLYM. COMPOS., 40:3101–3114, 2019. © 2018 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Functionalized siloxane‐silsesquioxane resins and polypropylene‐based composites: Morphological, structural, thermal, and mechanical properties

et al. 2018

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“…The activities of these SIL systems with imidazolium ionic liquid are lower (555.7, 316.5 and 1171.4 kg PE (mol V) −1 (0.5 h) −1 , respectively, for S 1–3 ) as compared to those for the SIL systems with pyridinium ionic liquid (837.7, 506.3 and 2128.0 kg PE (mol V) −1 (0.5 h) −1 ) (Table , entries 1, 5 and 13). Thus, the use of the pyridinium ionic liquid proves to be advantageous, as it is also in the case of biphasic ionic liquid–hexane ethylene polymerization . Pyridinium ionic liquids are characterized by higher densities as compared to imidazolium analogues at relatively low viscosities .…”

Section: Resultsmentioning

confidence: 99%

“…This work describes a study of ethylene polymerization using a series of SIL systems, in which the Cp 2 VCl 2 vanadocene catalyst was immobilized on three types of silica, which were modified by covalent anchorage of a pyridinium ionic liquid. The pyridinium ionic liquid was applied previously in biphasic ethylene polymerization, which led to PE with very high crystallinity . Also, the pyridinium ionic liquid has been immobilized on mesoporous silica SBA‐15 and applied in Knoevenagel reaction, which results in very good yields .…”

Section: Introductionmentioning

confidence: 99%

Ethylene polymerization using vanadium catalyst supported on silica modified by pyridinium ionic liquid

Ochędzan‐Siodłak

Bihun

Olszowy

et al. 2016

Polymer International

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Vanadium catalyst systems (SIL1–3A(B)/V) for ethylene polymerization were obtained by immobilization of the Cp2VCl2 precursor (V) in the ionic liquid 1‐[3‐(triethoxysilyl)propyl]pyridinium chloride (IL), modified by AlCl3 and AlEtCl2 (A) or AlEt2Cl (B), and supported on three types of silica carrier S1–3. The properties of the ionic liquid supports were determined using Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller measurements, scanning electron microscopy and elemental analysis. The best results (above 2 tons PE (mol V)−1 (0.5 h)−1) were obtained using the catalyst system SIL3B/V. Addition of ethyl trichloroacetate is possible in the ionic liquid medium and it further increases the activity up to 7 tons PE (mol V)−1 (0.5 h)−1. In contrast, application of the imidazolium ionic liquid to the SIL system or application the analogous catalyst system without the ionic liquid results in lower activities. The obtained polyethylene (PE) is a linear polymer, with molecular weight (Mw) of over 106 g mol−1 and molecular weight distribution (Mw/Mn) in the range 1.6–1.9, and has a characteristic fluffy or fibrous shape. In contrast, the PE samples obtained using the systems without ionic liquid reveal broader Mw/Mn (2.5–3.7) and replicate the support morphology. © 2016 Society of Chemical Industry

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“…Rogers and co-workers (107) Recently there have been reports of the use of biphasic RTIL systems for metallocene-catalyzed polymerization of ethylene (108,109). Ionic liquid modified silica has also been used in combination with metallocenes for ethylene polymerization (110).…”

Section: Transition-metal Catalyzed Polymerizationmentioning

confidence: 99%

Polymerization in Ionic Liquids

Zhang

Behera

Hong

et al. 2015

Encyclopedia of Polymer Science and Technology

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Room temperature ionic liquids (RTILs) have proved over recent years to be useful and unique reaction media for a variety of chemical reactions. Faster reaction rates and better selectivities are often observed in RTILs as compared to those in common organic solvents. In addition to these advantages, the low volatility, nonflammability, and recycling potential also help RTILs become a preferred alternative reaction medium to meet environmental and other requirements. This is evidenced by the ever increasing number of papers published in this area every year and interesting and important discoveries. When conventional free radical polymerizations are carried out in RTILs, there is an increase in the propagation rate due to the high polarity of the RTIL and a decrease in the termination rate because of the high viscosity of the RTILs, and thus the overall reaction rate is greatly increased along with an increase in molecular weight. For living/controlled polymerization such as atom transfer radical polymerization and radical addition‐fragmentation and transfer, the reactions in RTILs are still controllable with faster reaction rates and easy separation of catalysts and/or ligands from the resulting polymers. Nearly all types of polymerization processes have now been successfully conducted in RTILs, often with advantageous effects.

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High crystallinity polyethylene obtained in biphasic polymerization using pyridinium chloroaluminate ionic liquid

Cited by 8 publications

References 45 publications

Functionalized siloxane‐silsesquioxane resins and polypropylene‐based composites: Morphological, structural, thermal, and mechanical properties

Functionalized siloxane‐silsesquioxane resins and polypropylene‐based composites: Morphological, structural, thermal, and mechanical properties

Ethylene polymerization using vanadium catalyst supported on silica modified by pyridinium ionic liquid

Polymerization in Ionic Liquids

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