Summary

Polymer science, as a discipline, delves into the complexities of macromolecular synthesis, chain architecture, self-assembly, and the dynamics that govern material properties. From the microcosm of monomers, repeating units, and chain conformations to the macrocosm of bulk plastics, elastomers, fibers, composites, and global polymer industries, these polymer concepts will unravel the threads that weave together the fabric of macromolecular science and engineering.

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Topic Review
Polyether Ether Ketone
Polyether ether ketone is a semi-crystalline aromatic thermoplastic whose repeat unit joins para-substituted phenyl rings through ether and ketone linkages [1]. The aromatic backbone gives chemical resistance and a high continuous service temperature, while the crystallinity of about thirty per cent fixes stiffness and the amorphous phase governs toughness [1]. The polymer melts near 343 degrees Celsius, keeps a glass transition at about 143 degrees, dissolves only in strong acids, and is sulfonated by concentrated sulfuric acid at the ring [1]. Carbon or glass fibre raises modulus and creep resistance and reduces the mismatch in thermal expansion with metal [2]. Because the elastic modulus approaches that of cortical bone, the unfilled polymer is examined as an implant material, although its bioinert surface bonds weakly to tissue [3].
  • 3
  • 06 Nov 2026
Topic Review
Degree of Substitution
Degree of Substitution is the average number of substituent groups attached per repeat unit of a polymer, expressed either as a fraction of the available hydroxyl groups or as moles of substituent per anhydroglucose unit. In cellulose and starch derivatives it fixes charge density, solubility and chain extension, and it is obtained by titration, elemental analysis or spectroscopy rather than assumed from the feed ratio. Acetylated cellulose nanocrystals characterised over a range of values relate the substitution level to crystallinity and to the dispersion of the rods [1]. A mass-spectrometric method determines the value for a 6-aldehydo cellulose from its fragment pattern [2]. In carboxymethyl cellulose films the same parameter sets the response to the solvent environment [3].
  • 6
  • 06 Nov 2026
Topic Review
Chitosan Derivatives
Chitosan Derivatives are chitosans whose amino or hydroxyl groups have been substituted, grafted or quaternised, so a polymer soluble only in dilute acid becomes one whose solubility, charge and reactivity are set by the substituent. The degree and the position of substitution, on C2, C3 or C6, fix the properties more than the parent molecular weight does. Quaternisation of the amino group with glycidyltrimethylammonium chloride gives a permanently cationic chitosan that dissolves over a wider pH range [1]. Reviews of the preparation routes relate the substitution pattern to charge density and to the biological response [2]. Grafted derivatives form superabsorbent networks whose uptake follows the ionic content [3].
  • 7
  • 06 Nov 2026
Topic Review
Emulsion Styrene Butadiene Rubber
Can emulsion SBR evolve to meet the demands of next generation rubber applications? Explore how molecular architecture, polymer filler interactions, and sustainable feedstocks could unlock new possibilities for this established material.
  • 18
  • 30 Oct 2026
Topic Review
Carbon Nanotube/Polymer Nanocomposites
Carbon nanotubes  can be combined with polymer matrices to produce nanocomposites with higher performance metrics, as well as new multifunctional properties that the original polymer did not display. This entry aims to act as a brief introduction to the factors and concepts of importance for carbon nanotube/polymer nanocomposites.
  • 13
  • 26 Oct 2026
Topic Review
Amphiphilic Copolymers
Amphiphilic Copolymers are chains that carry both hydrophilic and hydrophobic segments, so they assemble at interfaces and in water [1]. Well-defined block copolymers of this kind form three-dimensionally ordered porous membranes through self-assembly and reverse micelle formation [1]. Folded amphiphilic homopolymer micelles assemble uniformly in water, which goes beyond what random copolymers achieve [2]. Comb-like amphiphilic copolymers assemble into micelles and vesicles whose form depends on the side-chain length [3]. Nucleobase-containing polypeptide copolymers combine hydrogen-bonding recognition with amphiphilic assembly [4]. Comb-like architectures in aqueous solution follow the same balance of core segregation and coronal stabilisation [5].
  • 11
  • 06 Nov 2026
Topic Review
Polysiloxanes
Polysiloxanes are polymers whose backbone alternates silicon and oxygen atoms, with organic groups attached to silicon, and the flexible siloxane linkage gives them wide service-temperature windows [1]. Cationic ultraviolet-curable polysiloxanes have been synthesised, and their cured films combined with epoxy resin have been characterised [1]. In energetic formulations the same backbone supplies thermal stability and processability, reviewed across the class [2]. Side-chain polyhedral oligomeric silsesquioxane groups raise the stiffness of the siloxane chain while keeping its flexibility [3]. Polysiloxanes carrying photoconductive and electro-optical units have been prepared for optoelectronic duty [4]. Multifunctional photo-refractive polysiloxanes show how structural characterisation ties the siloxane backbone to the optical response [5].
  • 6
  • 06 Nov 2026
Topic Review
Solvent Casting
Solvent Casting is a film-preparation method in which a polymer is dissolved, the solution is spread on a support, and the solvent is removed to leave a solid film [1]. A europium-substituted polyoxotungstate cast from solvent forms a film whose photophysical properties differ from those of its Langmuir-Blodgett counterpart [1]. Chitosan-filled polylactic acid films prepared by casting behave differently from melt-blended ones in mechanical and structural terms [2]. Piezoelectric poly(vinylidene fluoride)/hydroxyapatite/silver nitrate films are cast into thin biocompatible sheets [3]. Layer casting combined with freeze-drying and lamination produces porous gelatin/hydroxyapatite scaffolds with controlled porosity [4]. Compared with Pickering emulsion processing, casting gives a different balance of mechanical properties in surface-modified cellulose nanomaterial-reinforced polylactic acid composites [5].
  • 22
  • 06 Nov 2026
Topic Review
Glycidyl Methacrylate
Glycidyl Methacrylate is a methacrylate monomer carrying a pendant epoxide ring, which makes it a handle for both radical polymerisation and post-polymerisation epoxy chemistry [1]. Grafted from cellulose by RAFT-mediated polymerisation, it installs epoxy groups on the polysaccharide backbone [1]. Grafting poly(glycidyl methacrylate) onto alumina particles and crosslinking the chains raises the thermal conductivity of the resulting epoxy composite [2]. Combining atom transfer radical polymerisation with anionic ring-opening polymerisation converts the epoxide into a polyether block, giving poly(glycidyl methacrylate)-g-dimethylsiloxane [3]. Melt grafting onto polypropylene is moderated by tea polyphenols, which limit radical side reactions [4]. Statistical, gradient and block copolymers with alkyl methacrylates have been prepared by nitroxide-mediated polymerisation, fixing the epoxide content per chain [5].
  • 13
  • 06 Nov 2026
Topic Review
Centrifugal Spinning
Centrifugal Spinning is a fibre-forming method in which a polymer solution or melt is ejected from a rotating nozzle or reservoir, and the centrifugal force draws the jet into a thin filament [1]. A regularized thin-fiber model describes how the jet thins and solidifies into a nanofibre [1]. Amylopectin-rich starches spin into fibres whose formation mechanism follows the evolution of the jet in the same system [2]. At high rotation speed, slip of the polymer solution governs the outcome, and poly(ethylene oxide)/poly(vinyl alcohol) composite fibres have been produced on that basis [3]. Polymer concentration and nozzle material both shift the attainable fibre diameter [4]. The process also yields fibrous scaffolds for cell culture, where the open, aligned architecture supports attachment and spreading [5].
  • 11
  • 06 Nov 2026
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