Results 71 to 80 of about 8,053 (218)
Molecular weight dependence and stereoselective chain cleavage during the early stages of the isotactic polypropylene pyrolysis [PDF]
, 2017 The comparative study on the pyrolysis of two Polypropylene samples, with a similar high isotactic character but quite distinct molecular weights, reveals a significant difference in their thermal performances.
Benavente, Rosario +2 more
core +1 more source
Small Methods, Volume 10, Issue 2, 22 January 2026.A sustainable alternative to the energy‐intensive traditional thermocatalytic hydrogenation of acetylene to ethylene is reported. The catalyst is a cobalt single‐atom catalyst supported on carbon nitride that is powered by visible light, uses water as a proton source and demonstrates high selectivity, stability, and recyclability.
Anna Fortunato +8 more
wiley +1 more source
اثر اصلاح کنند ه ها روی فعالیت کاتالیزورهای زیگلر-ناتا و خواص نهایی پلیمر در پلیمرشدن اولفین ها [PDF]
Baspārish, 2015 فعالیت کاتالیزور از مهم ترین پارامترها در فرایندهای پلیمرشدن است. برای یک سامانه کاتالیزوریفعالیت ممکن است به شرایط پلیمرشدن از قبیل دما و فشار وابسته باشد.
رضا بازوند +3 more
doaj +1 more source
Electrical Materials and Applications, Volume 3, Issue 1, January/December 2026.The polypropylene (PP) dielectric film undergoes severe degradation at high temperature. Electron‐beam irradiation crosslinking induces the formation of a compact spherulitic morphology in PP, which effectively restricts molecular‐chain mobility and hinders oxygen diffusion, thereby enhancing its long‐term thermal stability.
Liangtian Zhang +8 more
wiley +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 +2 more
core +1 more source
Correlation Between Vinyl Content of Recycled HDPE and Polymer Degradation: An NMR Approach
Journal of Applied Polymer Science, Volume 142, Issue 47, December 15, 2025.The degradation behavior of high‐density polyethylene (HDPE) during recycling depends on its vinyl group content. This study shows that 1H NMR spectroscopy enables accurate assessment of vinyl groups unlike FTIR. Changes in melt flow and molecular weight with multiple processing are linked to vinyl content which could enable tailor‐made re‐additivation
Kim Hao Ng +3 more
wiley +1 more source
Tailoring polypropylene properties by package of internal/external donor in Ziegler Natta catalysts [PDF]
Polyolefins JournalInsights 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 +3 more
doaj +1 more source
Automated measurement system for ethene polymerization [PDF]
, 2011 Cílem práce bylo sestavit zařízení umožňující automatizované měření kinetických charakteristik katalytických systémů použitých při roztokové polymeraci ethenu.
Janošík, Zdeněk
core
Copolymerization Studies of Vinyl Chloride and Vinyl Acetate with Ethylene Using a Transition-Metal Catalyst [PDF]
, 2002 Since the advent of Ziegler−Natta polymerization of ethylene, attempts have been made to extend coordination polymerization to commercially important monomers with polar functionality. In this study we examined the copolymerization of perdeuterated vinyl
Athey, Phillip S. +5 more
core +1 more source
Macromolecular Rapid Communications, Volume 46, Issue 23, December 5, 2025.Can artificial intelligence fully replace humans in polymer discovery? How can we effectively harness AI's potential while preserving human creativity, ethics, and expertise? Does AI introduce new biases and interpretability challenges into SDL? This perspective aims to answer these important questions and advocates for symbiotic human‐AI intelligence ...
Bahar Dadfar +2 more
wiley +1 more source