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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Nitriles to Amines: LiAlH4 Reduction00:55

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Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
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Nitriles to Ketones: Grignard Reaction00:57

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Organomagnesium halides, commonly known as Grignard reagents, convert nitriles to ketones and proceed through a nucleophilic acyl substitution. Nitriles react with a Grignard reagent, followed by an aqueous acid, to yield ketones. The reaction introduces a new carbon–carbon bond. The alkyl–magnesium bond in the Grignard reagent is highly polar, so the alkyl carbon develops a carbanionic character and acts as a nucleophile.
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Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
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Preparation of Amines: Reduction of Amides and Nitriles01:13

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Nitriles can be reduced to primary amines using reducing agents like lithium aluminum hydride or catalytic hydrogenation. The reduction introduces an amino group with an extra carbon in the skeleton. Nitriles are formed from the reaction between alkyl halides and sodium cyanide through the SN2 mechanism. Primary alkyl halides are the preferred substrates to prepare nitriles.
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Modification of Talc@TiO2 toward high-performance nitrile rubber application.

Chao He1, Lin Zhang1, Duoli Chen1

  • 1Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University Chengdu 610031 China fxq@home.swjtu.edu.cn +86 028 87600128 +86 028 87600128.

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Modified talcum powder (Talc) with nano-titania (TiO2) using coupling agents improves dispersion in polymers. These enhanced Talc@TiO2 particles boost rubber performance, offering better damping and impact resistance.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Improving talcum powder (Talc) dispersion is crucial for polymer applications.
  • Existing talc modifications may not sufficiently enhance dispersion and performance in specific polymers like carboxylated acrylonitrile-butadiene rubber (XNBR).
  • Nano-titania (TiO2) offers potential for surface modification due to its properties.

Purpose of the Study:

  • To enhance the dispersion of talcum powder (Talc) in polymer matrices.
  • To prepare novel Talc@TiO2 hybrid particles using various coupling agents.
  • To evaluate the dispersion and performance of modified Talc@TiO2 in XNBR.

Main Methods:

  • Surface modification of nano-titania (TiO2) using silane (KH550), titanate (NDZ201), and sodium polyacrylate (PAAS) coupling agents.
  • Adhesion of modified TiO2 onto Talc surfaces via ball milling to create Talc@TiO2 particles.
  • Assessment of colloidal dispersion of Talc@TiO2 in anhydrous ethanol and evaluation of modified hybrid XNBR performance.

Main Results:

  • Talc@TiO2 particles modified with PAAS and NDZ201 exhibited superior colloidal dispersion in ethanol compared to unmodified Talc and NDZ201-modified Talc@TiO2.
  • The enhanced dispersion is attributed to organification and charge repulsion effects.
  • Modified Talc@TiO2 hybrid XNBR demonstrated improved damping capacity and impact resistance.

Conclusions:

  • Surface modification of talc with nano-titania using specific coupling agents significantly improves its dispersion in polymers.
  • The improved dispersion and adhesion of modified Talc@TiO2 particles enhance the mechanical properties of XNBR.
  • This approach offers a viable strategy for developing high-performance polymer composites.