Copolymer, statistical

Although it has been known for many years that ethylene oxide and formaldehyde ean form statistical copolymers, it was not until the interest in crown ethers developed that the potential of macrocyclic formals as complexing agents was recognized. 

Common rubbery materials consist of butadiene and styrene statistical copolymers, written poly(butadiene-sfaf-styrene). The butadi-... 

Statistical copolymers are formed when mixtures of two or more monomers are polymerized by a radical process. Many reviews on the kinetics and mechanism of statistical copolymerization have appeared1 9 and some detail can be found in most text books on polymerization. The term random copolymer, often used to describe these materials, is generally not appropriate since the incorporation of monomer units is seldom a purely random process. The... 

One of the major advantages of radical polymerization over most other forms of polymerization, (anionic, cationic, coordination) is that statistical copolymers can be prepared from a very wide range of monomer types that can contain various unprotected functionalities. Radical copolymerization and the factors that influence copolymer structure have been discussed in Chapter 7. Copolymerization of macromonomers by NMP, ATRP and RAFT is discussed in Section 9.10.1. 

State Correlation Diagram (SCO) approach 27-8 statistical copolymerization see copolymerization statistical copolymers sea also copolymers definition 333... 

The endopolygalacturonase obtained from a Kluyveromyces marxianus culture broth was purified through the addition of specifically designed core-shell microspheres consisting of an inner polystyrene core and an outer shell constituted by a poly(methacrylic acid-co-ethylacrylate) statistical copolymer. These microspheres were previously found very effective in purifying the pectinlyase within a commercial pectinase sample [15]. 

In what follows, we use simple mean-field theories to predict polymer phase diagrams and then use numerical simulations to study the kinetics of polymer crystallization behaviors and the morphologies of the resulting polymer crystals. More specifically, in the molecular driving forces for the crystallization of statistical copolymers, the distinction of comonomer sequences from monomer sequences can be represented by the absence (presence) of parallel attractions. We also devote considerable attention to the study of the free-energy landscape of single-chain homopolymer crystallites. For readers interested in the computational techniques that we used, we provide a detailed description in the Appendix. ... 

Table 1. Statistical copolymers of FOA with vinyl monomers. Polymerizations were conducted at 59.4 +0.1°C and 345 + 0.5 bar for 48 hours in C02. Intrinsic viscosities were determined in 1,1,2-trifluorotrichloroethane (Freon-113) at 30 °C [23]...

The form of the distribution (Eq. 101), as shown in Fig. 7, qualitatively differs from that exhibited by this distribution for the products of homophase copolymerization. This distinction takes place both in real systems (ri < l,r2 < 1), where statistical copolymers are formed and in hypothetical systems (ri l,r2 1), where the formation of multiblock copolymers is expected. Essentially, the composition distribution in the latter systems... 

It is interesting that statistical copolymers 343, containing m-phenylene linkages that are supposed to interrupt conjugation, showed a PL maximum of 475 nm, similar to 342. Due to efficient energy transfer from the meta- to the para-linked chromophores, the emission maxima did not depend on the ratio of m- and p-divinylbenzenes, unless 100% loading of the meta units was used [420] (Scheme 2.54). 

X. Jiang, R.A. Register, K.A. Killeen, M.E. Thompson, F. Pschenitzka, and J.C. Sturm, Statistical copolymers with side-chain hole and electron transport groups for single-layer electroluminescent device applications, Chem. Mater., 12 2542-2549, 2000. 

Metallosupramolecular graft copolymers have been prepared from a statistical copolymer containing methylmethacrylate and a methacrylate bearing a terpyridine group in the side chain. Terpyridine end-functionalized... 

Previous work on allyl methacrylate homopolymers and statistical copolymers clearly showed that the allyl group is a very effective cross-linking function when exposed to x-rays (2) ... 

Synthesis of BPSH statistical copolymer (14) via direct polymerization. 

As typically observed in the case of non-ionic block and graft copolymers, the immiscibility of the constituent blocks within the copolymers can induce microphase separation beyond even that which normally occurs due to hydrophobic and hydrophilic sites within statistical copolymer PEMs such as Nation. A relatively recent area of PEM research, ionic block and graft copolymers are interesting from the point of view of providing fundamental understanding about the influence of morphology upon proton conduction... 

Wang, R, Hickner, M., Kim, Y. S., Zawodzinski, T. A. and McGrath, J. E. 2002. Direct polymerization of sulfonated poly(arylene ether sulfone) random (statistical) copolymers Candidates for new proton exchange membranes. Journal of... 

Direct Copoiymerization of Sulfonated Monomers To Afford Random (Statistical) Copolymers 4595... 

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