The glass transition temperature of a copolymer depends not only on chemical composition but also on its comonomer sequences. This experimental fact is explained by Barton's and Johnston's equations. Their equations, though complicated, become simple, if a suitable parameter is used to describe the comonomer sequences. It is shown that with these new expressions, their equations can be used to understand glass transition temperatures of two additional types of copolymers, compatible multiblock copolymers and homopolymers with various tacticities treated as steric copolymers.
Among widely available polymer-based packing materials, the most popular are non-polar styrene–divinylbenzene (ST-DVB) copolymers. As these materials are highly hydrophobic, they possess rather restriction and
Authors:Zbigniew Czech, Robert Pełech, Krzysztof Zych, and Jolanta Świderska
Methacrylate copolymers with their excellent physical, chemical, and mechanical properties are widely used in many applications such as raw materials for adhesives, polymeric films, paints, varnishes, and sealants
Authors:Stavroula G. Nanaki, George Z. Papageorgiou, and Dimitrios N. Bikiaris
cost and high quality [ 7 , 8 ] and this enables polyester production. Thus, only recently, papers dealing with polyesters based on 1,3-PD have been published [ 9 – 14 ].
Block copolymers consist of a most promising class of polymeric materials
-dimensional structures or to form encapsulations of water-in-oil (w/o) and oil-in-water (o/w) solutions [ 2 – 7 ]. Using asymmetric Y-shaped triblock copolymers planted on the surface of the spherical particles or the plane material of montmorillonite manocomposites to
The chemical structure of the starting polymer, the type of monovinyl monomer and the polymer/monovinyl monomer ratio significantly influences the thermal and mechanical properties of manufactured copolymers. The
Authors:Tamara G. Oberti, José Luis Alessandrini, and M. Susana Cortizo
their structure–property relationship. Homo- and copolymers derived from acrylic and methacrylic esters are the materials most used in various industries because of their chemical, rheological, mechanical, electrical, and optical properties [ 1 – 4
Authors:H. P. de Oliveira, J. Rieumont, C. Nogueiras, D. Souza, and R. Sánchez
Amphiphilic block copolymers are characterized by a hydrophobic block linked to a hydrophilic block by a covalent bond. These materials are interesting if applied as incompatible or heterogeneous blend in itself
Poly(AN—co—St) (PAS) and poly(AN—St—MMA)(PASM) were synthetized by emulsion polymerisation. The glass transition temperatures (Tg) of the copolymers and the relationship between Tg and the components of the copolymers were investigated by differential scanning calorimetry. The results show that Tg for the AN—St bipolymers has apeak value in the range 115–118°C at a content of 50 mass% St. When methyl methacrylate was added, the Tg of the terpolymer was decreased by about 2–6°C.The thermostability and the activation energy E of degradation were determined by thermogravimetric analysis.