Semi-aromatic Polyester
Semi-aromatic Polyester - Related Videos
10:22
Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Cited by 1 •
2020
An example of a closed-loop approach towards a circular materials economy is described here. A whole sustainable cycle is presented where biobased semi-aromatic polyesters are designed by polymerization, depolymerization, and then re-polymerized with only slight changes in their yields or final properties.
10:27
The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight
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Cited by 12 •
2016
Two types of surfaces, polyester-coated steel and polyester coated with a layer of silica nanoparticles, were studied. Both surfaces were exposed to sunlight, which was found to cause substantial changes in the chemistry and nanoscale topography of the surface.
09:47
Isolation and Compositional Analysis of Plant Cuticle Lipid Polyester Monomers
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Cited by 32 •
2015
Lipid polyesters constitute the structural components of two cell wall modifications, the plant cuticle and suberin-containing diffusion barriers. In this video, we describe a method to depolymerize cutin from whole delipidated leaves. The method can be applied to investigating mutants compromised in either cutin or suberin biosynthesis.
01:14
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1
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2023
Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction. In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo, or cyano...
01:20
Types of Step-Growth Polymers: Polyesters
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2023
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes. Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
FAQs
Formation relies on polycondensation, where diacids, diols, or related monomers participate in esterification or transesterification. As ester linkages form, water or alcohol is removed as a small molecule. This reaction pathway connects monomer-derived segments into longer chains while allowing chemists to select the chemical partners that establish aromatic and aliphatic content and influence the resulting polymer’s behavior.
Aromatic segments make the chain more rigid and improve thermal resistance, while aliphatic segments contribute flexibility and processability. Their coexistence lets materials chemists adjust the balance between structural stability and ease of processing rather than relying on one type of chain segment alone. This balance matters when designing films, fibers, coatings, or other engineered materials.
Changing monomer structure and composition can tune crystallinity, melting behavior, mechanical strength, and degradation rates. These variables are connected to how the polymer chains are built and how aromatic and aliphatic units are distributed within them. Consequently, chemists can modify the material profile to suit different processing requirements or performance goals in polymer applications.
Chemists can begin with diacids, diols, or related monomers and use either esterification or transesterification during polycondensation. The synthesis also includes removal of a small molecule, specifically water or alcohol. Selecting the monomer combination determines the aromatic-to-aliphatic structure, while the chosen reaction pathway identifies how ester-linked chains are assembled.
Its combination of rigidity, thermal resistance, flexibility, and processability supports several material formats and uses. The source identifies packaging, fibers, films, coatings, and other engineered polymer materials as applications. The appropriate formulation depends on the balance of properties required, such as mechanical performance, melting behavior, degradation rate, or ease of processing.
Researchers can evaluate changes in crystallinity, melting behavior, mechanical strength, and degradation rates after modifying monomer structure or composition. These measurements show how molecular design affects the behavior of the resulting material. In chemistry and materials research, such comparisons help connect ester-linked chain structure with practical suitability for packaging, fibers, films, coatings, or other engineered forms.