Nuclear Magnetic Resonance Evidence for a New Microstructure in Ethene-Cyclopentene Copolymers

Jerschow, Alexej; Ernst, E.; Hermann, W.; Müller, Norbert

doi:10.1021/ma00125a010

Cited by 48 publications

(36 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The differences in the microstructures of raw S‐SBRs obtained from the NMR and IR analysis results were examined. In general, NMR is a more reliable and proper analytical technique for quantitative analysis of the microstructure of polymers compared to IR . The results of the NMR analysis versus the IR analysis of the raw S‐SBRs were plotted as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Analytical considerations for determination of the microstructures of sulfur‐cured solution styrene − butadiene rubbers

Choi

Kim

Kwon

2017

Polymer International

View full text Add to dashboard Cite

The microstructures of solution styrene − butadiene copolymer (S‐SBR) vulcanizates were analyzed using liquid H NMR spectroscopy and transmission Fourier transform IR spectroscopy, and the results were compared with the raw S‐SBRs. The microstructures of the cured and raw S‐SBRs were different because of the pendent group formed by the cure accelerator and cis − trans isomerization. The styrene and trans‐1,4‐unit contents of the cured S‐SBRs were larger than those of the raw S‐SBRs, whereas the 1,2‐unit contents of the cured S‐SBRs were on the whole smaller than those of the raw S‐SBRs. The results of NMR and IR spectroscopy were also compared. Considering the analytical error ranges and consistency of the analysis results, a proper analytical method and process are suggested. NMR analysis results had narrower error ranges and better correlation than IR spectroscopy results. It was was found to be acceptable that the cis‐1,4‐unit contents were obtained by subtracting the trans‐1,4‐unit contents from the 1,4‐unit contents determined by NMR analysis. © 2017 Society of Chemical Industry

show abstract

Section: Resultsmentioning

confidence: 99%

Analytical considerations for determination of the microstructures of sulfur‐cured solution styrene − butadiene rubbers

Choi

Kim

Kwon

2017

Polymer International

View full text Add to dashboard Cite

show abstract

“…COCs can be produced by copolymerization of a-olefins, like ethylene or propylene, with cycloalkenes; a drawback of this method is, however, the low reactivity of cyclic alkenes with respect to that of linear olefins [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Ethylene/1,3-butadiene cyclocopolymerization catalyzed by zirconocene systems

Pragliola

Costabile

Venditto

2014

European Polymer Journal

View full text Add to dashboard Cite

“…Olefin polymerization by homogeneous transition‐metal complexes is considered to be a mature field of polymer chemistry, especially when using early‐transition metals 1–6. Over the past twenty years it has emerged that Group 4 transition‐metal complexes containing amide ligands are promising systems in olefin polymerization catalysis 2.…”

Section: Introductionmentioning

confidence: 99%

Access to Ultra‐High‐Molecular Weight Poly(ethylene) and Activity Boost in the Presence of Cyclopentene With Group 4 Bis‐Amido Complexes

Narayana

Wang

et al. 2013

ChemPlusChem

View full text Add to dashboard Cite

ZrIV complexes of the type [Me2Si{(NR)(6‐{2‐(diethylboryl)phenyl}pyridyl‐2‐yl‐N)}ZrCl2⋅thf] (R=tBu (4), adamantyl (7 a); thf=tetrahydrofuran), [Me2Si{(NAd)(6‐{2‐(diphenylboryl)phenyl}pyridyl‐2‐yl‐N)}ZrCl2] (Ad=adamantyl (7 b)), the nonbridged half‐titanocene complexes of the type [(N‐{6‐(2‐diethylborylphenyl)pyrid‐2‐yl}‐NR)Cp′TiCl2] (R=Me, Cp′=C5H5 (12), Cp′=C5Me5 (13)), and the titanium(IV)‐based metallocene‐type complex [bis{N‐(6‐{2‐(diethylboryl)phenyl}pyrid‐2‐yl)NMe}TiCl2] (14) have been synthesized. The structures of complexes 7 b, 12, and 13 were determined by single‐crystal X‐ray diffraction analysis. In solution, complex 4 slowly rearranges to [Me2Si{(N‐tBu)(6‐{2‐(diethylboryl)phenyl}pyridyl‐2‐yl‐N)}2Zr] (4 a), the structure of which was unambiguously confirmed by single‐crystal X‐ray crystallography. Similarly, reaction of HfCl4 with Me2Si({RNLi}{6‐[2‐(diethylboryl)phenyl]pyridyl‐2‐ylNLi}) yielded the corresponding HfIV complexes [Me2Si{(NR)(6‐{2‐(diethylboryl)phenyl}pyridyl‐2‐ylN)}2Hf] (R=tBu (8) and Ad (9)). Upon activation of these complexes with methylalumoxane (MAO), complexes 4, 7 a, 7 b, and 12–14 showed activities up to 750 kg of polyethylene (PE)/molcat. bar h in the homopolymerization of ethylene (E), producing mainly linear PE (high‐density PE, HDPE) with molecular weights in the range of 1 800 000

show abstract

Nuclear Magnetic Resonance Evidence for a New Microstructure in Ethene-Cyclopentene Copolymers

Cited by 48 publications

References 2 publications

Analytical considerations for determination of the microstructures of sulfur‐cured solution styrene − butadiene rubbers

Analytical considerations for determination of the microstructures of sulfur‐cured solution styrene − butadiene rubbers

Ethylene/1,3-butadiene cyclocopolymerization catalyzed by zirconocene systems

Access to Ultra‐High‐Molecular Weight Poly(ethylene) and Activity Boost in the Presence of Cyclopentene With Group 4 Bis‐Amido Complexes

Contact Info

Product

Resources

About