Polymerization Of Olefins By Complex Metal Catalysts

Stille, J. K.

doi:10.1021/cr50021a004

Cited by 36 publications

(7 citation statements)

References 22 publications

(41 reference statements)

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“…NR can be epoxidized in solution or in the latex stage by peracids . An amount of 100 g of rubber was made into a solution in toluene in a three‐necked, round‐bottomed flask equipped with a thermometer, mechanical stirrer, and condenser.…”

Section: Methodsmentioning

confidence: 99%

Epoxidized natural rubber/epoxy blends: Phase morphology and thermomechanical properties

Mathew¹,

George²,

Parameswaranpillai

et al. 2013

J of Applied Polymer Sci

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Epoxidized natural rubbers (ENRs) were prepared. ENRs with different concentrations of up to 20 wt % were used as modifiers for epoxy resin. The epoxy monomer was cured with nadic methyl anhydride as a hardener in the presence of N,Ndimethyl benzyl amine as an accelerator. The addition of ENR to an anhydride hardener/epoxy monomer mixture gave rise to the formation of a phase-separated structure consisting of rubber domains dispersed in the epoxy-rich phase. The particle size increased with increasing ENR content. The phase separation was investigated by scanning electron microscopy and dynamic mechanical analysis. The viscoelastic behavior of the liquid-rubber-modified epoxy resin was also evaluated with dynamic mechanical analysis. The storage moduli, loss moduli, and tan d values were determined for the blends of the epoxy resin with ENR. The effect of the addition of rubber on the glass-transition temperature of the epoxy matrix was followed. The thermal stability of the ENR-modified epoxy resin was studied with thermogravimetric analysis. Parameters such as the onset of degradation, maximum degradation temperature, and final degradation were not affected by the addition of ENR. The mechanical properties of the liquid-natural-rubber-modified epoxy resin were measured in terms of the fracture toughness and impact strength. The maximum impact strength and fracture toughness were observed with 10 wt % ENR modified epoxy blends. Various toughening mechanisms responsible for the enhancement in toughness of the diglycidyl ether of the bisphenol A/ENR blends were investigated. V C 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39906.

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Section: Methodsmentioning

confidence: 99%

Epoxidized natural rubber/epoxy blends: Phase morphology and thermomechanical properties

Mathew¹,

George²,

Parameswaranpillai

et al. 2013

J of Applied Polymer Sci

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“…(2) The catalytic polymerization of olefins using aluminum alkyls and titanium tetrachloride or organotitanium compounds (15,16,40,185,229,268).…”

Section: Industrial Applicationsmentioning

confidence: 99%

The History and Development of Organotransition Metal Chemistry

Rausch

1967

Werner Centennial

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Organotransition metal compounds have been known for over a century, but it has been only during the past 15 years that most of the major advances in this area have been made. Organotransition metal compounds consist of organic molecules or ligands coordinated to transition metals by one or more carbon atoms. In the present sur vey, the formation, properties, structure, and reactions of various classes of these substances are discussed. Empha sis has been placed on important discoveries and theories that have stimulated the rapid progress of organotransition metal chemistry. Pertinent reviews on various aspects of this subject have also been cited./^\rganometallic compounds containing neutral, unsaturated organic molecules coordinated to certain transition metals were known long before the advent of Werner's theories on coordination compounds. Until about 1950, however, this aspect of coordination chemistry remained fal low, and the structure and bonding of the compounds known at that time were quite perplexing. The discovery of ferrocene and the development of a rational theory of bonding in olefin-transition metal complexes in the early 1950's prompted a vigorous research effort around the world that has attracted the attention of organic chemists, inorganic chemists, crystallographers, and scientists of many allied disciplines. Research in organo transition metal chemistry presently is proceeding at a very rapid rate, and the synthesis and properties of seemingly unlimited new types of "organometallic, T complexes" represent an important frontier in coordina tion chemistry.The purpose of the present survey is twofold. Firstly, because the Werner Symposium is partly historical, some of the more important dis coveries and theories that have led to the present high level of interest in 486 Downloaded by UNIV OF NORTH CAROLINA on February 18, 2015 |

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“…In synthetic polymers which contain asymmetric centers every third carbon atom, three types of configurational relationships have been realized, isotactic, syndiotactic, and random (13). Propylene polymerization with bimetallic catalysts (probably anionic) gives isotactic polymer (14).…”

Section: Asymmetric Induction In Polymerizationmentioning

confidence: 99%