Reactively compatibilized polymer blends

Asthana Himanshu, and Jayaraman Krishnamurthy. Rheology of reactively compatibilized polymer blends with varying extent of interfacial reaction. Macromolecules. 32 no. 10 (1999) 3412-3419. 

Table 3.2 Examples of Reactively Compatibilized Polymer Blends Making Use of Ring Opening In Situ Reactions...

Tol RT, Groeninckx G, Vinckier I, Moldenaers P, Mewis J (2004) Phase morphology and stability of co-continuous (PPE/PS)/PA6 and PS/PA6 blends effect of rheology and reactive compatibilization. Polymer 45 2587-2601... 

The interphase thickness depends on the miscibility of the polymeric component as well as on the compatibilization. For uncompatibilized binary, strongly immiscible systems, the interphase thickness Al - 2 nm. The thickest interphase has been observed for reactively compatibilized polymer alloys Al = 65 nm. For most blends, the interphase thickness is in between these two limits. The importance on the interphase can be appreciated noting that its volume will be the same as that of the dispersed phase when the drop diameter (without interphase) is about 500 nm. It is noteworthy that in most commercial polymer alloys the drop diameter is about five times smaller, making the importance of the interphase much greater. 

A variety of reactive polymers have been utilized for compatibilizing polymer blends. They can be classified into eight major categories, with each category having one type of... 

The rheologies of un-compatibilized polymer blends have been the topic of numerous in depth studies [68-73]. The reader is directed to these references for background information, as this chapter will focus only on reactive blends. 

The fundamentals and practice of compatibilizing polymer blends using polymeric additives, has been amply discussed in several earlier chapters of this volume. Here we describe a relatively new technique for reactive compatibilization, which involves the addition of low molecular weight components. Using many two component systems we review how some of these components show the ability to form copolymers of the two starting polymer constituents during melt processing. 

Triacca VJ, Ziaee S, Barlow J-W, Keskkula H, Paul DR. Reactive compatibilization of blends of nylon 6 and ABS materials. Polymer 1991 32 1401-1413. 

Grading systems, for flax fiber, 77 617 Gradual failures, 26 981 Graduate students, role in facilitating research partnerships, 24 383 Graft copolymerization, 20 327. See also Graft polymerization Graft copolymers, 7 650-654 20 391 compatibilization efficiency of, 20 338 formation of, 23 395 in polymer blends, 20 324—325 in reactive compatibilization,... 

However, a reactive styrene acrylonitrile copolymer (SAN)/gly-cidl methacrylate copolymer was found to be an effective reactive compatibilizer for the blends. Ethyltriphenyl phosphonium bromide was used as the catalyst. Probably, the epoxide groups react either with carboxyl or with hydroxyl groups of the PLLA end groups. This so modified polymer acts as the compatibilizer. Compatibilized PLLA/ABS blends exhibit an improved impact strength and an im-... 

S.C. Tjong and Y.Z. Meng, Effect of reactive compatibilizers on the mechanical properties of polycarbonate/poly(acrylonitrile-buta-diene-styrene) blends, Enr. Polym. J., 36(1) 123-129, January 2000. 

Macromonomers afford a powerful means of designing a vast variety of well-defined graft copolymers. These species are particularly useful in the field of polymer blends as compatibilizers and/or stabilizers (surfactants). When macromonomer itself is an amphiphilic polymer, then its polymerization in water usually occurs rapidly as a result of organization into micelles. In copolymerizations, important factors for macromonomer reactivity are the thermodynamic repulsion or incompatibility between the macromonomer and the trunk polymer and its partitioning between the continuous phase and the polymer particles [4,5]. 

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