Polymer Pyrolysis
Polymer Pyrolysis - Related Videos
07:30
Fast Pyrolysis of Biomass Residues in a Twin-screw Mixing Reactor
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Cited by 20 •
2016
A procedure for thermochemical conversion of biomass residues is presented that aims at maximizing the yield of liquid products (fast pyrolysis). It is based on a technology proven on an industrial scale and especially suitable for treating a straw type of biomass.
02:34
Polymers
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2020
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
08:44
Tension Tests of Polymers
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA Polymeric materials are widely used in civil structures, with uses ranging from very soft sealants to more rigid pipes in water and wastewater systems. The most basic definition of a polymer is a molecular structure with repeating subunits. The term polymer comes from Greek, where "poly" means many, and "-mer" means basic unit. Monomers, or single mers, are the specific repeating units. With...
08:12
Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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2022
Here, we describe protocols for the preparation of trans-cyclobutane fused cyclooctenes (tCBCO), their polymerization to prepare depolymerizable olefinic polymers, and the depolymerization of these polymers under mild conditions. Additionally, protocols for the preparation of depolymerizable networks and compression molding of rigid linear plastics based on this system are described.
13:57
Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Cited by 4 •
2014
The methodology to perform friction force microscopy experiments for contacting brushes is presented: Two polymer brushes that are grafted from (a) substrates and (b) colloidal probes are slid to show that, by using two contacting immiscible brush systems, friction in sliding contacts is reduced compared to miscible brush systems.
FAQs
Polymer pyrolysis can proceed through several bond-breaking pathways. Random scission breaks backbone bonds at different locations, depolymerization separates a polymer into smaller molecular units, and secondary cracking further transforms molecules formed during initial decomposition. The relative contribution of these reactions affects whether the process produces more gases, oils, waxes, or carbon-rich solid residues.
Temperature, residence time, and pressure change how extensively polymer molecules decompose and undergo subsequent reactions. More severe thermal conditions can alter the balance between primary bond cleavage and secondary cracking, shifting the product distribution. Examining these variables helps chemists relate operating conditions to the formation of gases, oils, waxes, and solid residues.
Catalyst choice can influence the chemical pathways that occur as polymers break down, thereby affecting the distribution of products. In a chemistry investigation, comparing catalyzed and uncatalyzed conditions can help reveal how molecular transformations are directed. This information supports efforts to control product composition during polymer conversion and resource recovery.
The resulting gases, oils, waxes, and carbon-rich solid residues provide evidence about the degradation pathways followed by the starting polymer. Product distributions can indicate how extensively backbone bonds broke and whether secondary cracking contributed significantly. Chemists use these outcomes to connect polymer structure and processing conditions with the types of smaller molecules and residues produced.
A basic study places a polymeric material under controlled heating conditions with absent or very limited oxygen, then examines the products formed during decomposition. The investigation can vary temperature, residence time, pressure, or catalyst choice and compare the resulting gases, oils, waxes, and solid residues. This approach links processing conditions with chemical degradation behavior.
Polymer pyrolysis is useful when researchers need to study how polymer structures degrade or explore ways to recover value from plastic waste. Its products can support chemical recycling and resource recovery, while the reaction pathways provide insight into polymer stability and decomposition. The method also contributes to developing more sustainable strategies for managing polymeric materials.