Results 71 to 80 of about 7,913 (200)

An investigation of the melt blown web defect known as shot using metallocene and ziegler-natta based polypropylene resins [PDF]

, 2000
An extensive experimental investigation was undertaken to study the influence of processing parameters and resin type on the production of shot in the melt blowing process. Both early generation commercial metallocene and conventional Ziegler-Natta based
Qashou, Imad M.
core   +1 more source

Ultrasound- and microwave-assisted preparation of lead-free palladium catalysts: effects on the kinetics of diphenylacetylene semi-hydrogenation [PDF]

, 2015
The effect of environmentally benign enabling technologies such as ultrasound and microwaves on the preparation of the lead-free Pd catalyst has been studied.
Bonrath, Werner, Borretto, Emily, Cherkasov, Nikolay, Cravotto, Giancarlo, Ibhadon, Alex O., Medlock, Jonathan, Wu, Zhilin   +6 more
core   +1 more source

2,3‐Diboratabutadiene Complexes of Group 4 Metals and their Donor‐Induced Oxidative Cleavage to Methyleneboranes

ChemistryEurope, Volume 3, Issue 6, November 11, 2025.
GA: We here report the first perarylated 2,3‐diboratabutadiene dianion and its reaction with Cp2MCl2 (M = Zr, Hf) to afford unprecedented 2,3‐diboratabutadiene π‐complexes with unique coordination modes. Addition of an N‐heterocyclic carbene (NHC) to the complexes gives rise to the donor‐induced oxidation of the BB bond, resulting in two separate NHC ...
Philipp Grewelinger, Carsten Präsang, Bernd Morgenstern, David Scheschkewitz   +3 more
wiley   +1 more source

Bond Length - Bond Valence Relationships for Carbon - Carbon and Carbon - Oxygen Bonds [PDF]

, 2015
In the present study, relationships are developed for determining bond orders (also referred to as bond valences or bond numbers) from published bond lengths for carbon-carbon (C-C) and carbon-oxygen (C-O) bonds.
Hardcastle, F. D., Harris, C.
core   +3 more sources

Direct Carboboration of Aryl Alkenes with Stable Organoborons Through Ziegler‐Type Addition

Advanced Science, Volume 12, Issue 43, November 20, 2025.
The direct carboboration of vinyl arenes with benzylic boronates has been achieved using KOtBu as the catalyst. Vinylcyclopropanes and vinylcyclobutane also participate in this reaction, yielding the corresponding 1,5‐ and 1,6‐carboboration products.
Mo Yang, Shengda Chen, Daojing Li, Liuzhou Gao, Guoqiang Wang, Shuhua Li   +5 more
wiley   +1 more source

Heterogeneous Distribution of Entanglements in a Nonequilibrium Polymer Melt of UHMWPE: Influence on Crystallization without and with Graphene Oxide [PDF]

, 2016
In the past, studies have been performed to follow chain dynamics in an equilibrium polymer melt using low molar mass polymers. Here we show that in linear ultrahigh molecular weight polyethylene entanglements formed during or after polymerization are ...
Dario Romano, Ele L. de Boer, Ferry J. D., Kangsheng Liu, Sanjay Rastogi, Sara Ronca, Yefeng Yao   +6 more
core   +4 more sources

Propylene–Ethylene Copolymer Covalent Adaptable Networks Synthesized by Resonance‐Stabilized, Radical‐Based Reactive Processing with Excellent Elevated‐Temperature Creep Resistance

ChemSusChem, Volume 18, Issue 20, October 23, 2025.
Propylene‐ethylene copolymer covalent adaptable networks (PEC CANs) are synthesized via one‐step, radical‐based reactive processing with the use of initiator, dynamic cross‐linkers, and vinyl aromatic additives. The best CAN suppresses over 98% of creep at 100 °C (semicrystalline state) for 10,000 s compared to neat PEC.
Yen‐Wen Huang, Mathew J. Suazo, Stephanie M. Barbon, Hayley A. Brown, Evelyn Auyeung, Colin Li Pi Shan, John M. Torkelson   +6 more
wiley   +1 more source

Tailoring polypropylene properties by package of internal/external donor in Ziegler Natta catalysts [PDF]

Polyolefins Journal
Insights have been developed into the influence of different structures, including bismethoxymethylfluorene (B) and 2,2-diisopropyl succinate (I), on both internal donor (ID) and external donor (ED) roles on the performance of MgCl2/ID/TiCl4.
Nona Ghasemi Hamedani, Fatemeh Poorsank, Hassan Arabi, Seyed Mehdi Ghafelehbashi   +3 more
doaj   +1 more source

An Overview of the Potential of UV Modification of Polypropylene [PDF]

, 2016
This is the peer reviewed version of the following article: Amintowlieh, Y., Tzoganakis, C., & Penlidis, A. (2016). An Overview of the Potential of UV Modification of Polypropylene.
Amintowlieh, Yasaman, Penlidis, Alexander, Tzoganakis, Costas   +2 more
core   +1 more source

Advantages of an Emulsion‐Produced Ziegler‐Natta Catalyst Over a Conventional Ziegler‐Natta Catalyst

Macromolecular Materials and Engineering, 2005
AbstractSummary: Self‐supported and MgCl2‐supported Ziegler‐Natta catalysts, produced by two catalyst synthesis methods are compared. Borealis Polymers OY (Finland), who supplied the catalysts, developed the catalyst synthesis methods. The first method (Method One) is based on an emulsion system and consists of an in situ single step preparation.
Mohammed Abboud, Peter Denifl, Karl‐Heinz Reichert   +2 more
openaire   +1 more source