Polycarbonate, compatibilization with

Polycarbonate blends with polyQactic acid) have been compatibilized through addition of bis(isocyanate), bis(carbodiimide), oxazoUne-f-PS, or epoxy resin (Wang et al. 2012e Mukawa et al. 2011). 

Aromatic thermotropic liquid crystal polyesters (Ar-TLCP s) and TLCP s containing aliphatic linkages can be compatibilized as binary-TLCP blends by transesterification. The morphology and physical properties of the resultant binary-TLCP blend are dependent on the blockiness, composition and viscosity ratios of the two TLCP components. Polycarbonate (PC) can also be blend compatibilized with either TLCP s or binary-TLCP blends, by transesterification of aliphatic linkages from the TLCP s into the PC. In this work, the degree of selective transesterification is quantified and its effect on TLCP blend compatibility is described... 

Moreover the presence of a carbonate group close to the siloxane backbone was expected to help the compatibilization with the polycarbonate component. 

The DSC results for the reactive compatibilization of polycarbonate (PC) with a polyester (poly(ethyl methyl pentyl terepthalate)) are shown in Fig. 5.11, where the initial blend is phase separated, but with increasing time exposure at 200 °C phase mixing occurs [29]. The addition of a phosphate stabilizer (di-n-octyl phthalate DNOP) allows for preservation of phase separation imder time/temperature conditions, where miscibility is observed without catalyst deactivation. 

Blends with good mechanical properties can be made from DMPPO and polymers with which DMPPO is incompatible if an appropriate additive, compatibilizing agent, or treatment is used to increase the dispersion of the two phases. Such blends include mixtures of DMPPO with nylon, polycarbonate, polyester, ABS, and poly(phenylene sulfide). 

Polycarbonate-polystyrene blend along with poly(alkylene-dicarboxylate) such as SMA SEBS copolymer for toughening blends of PPO with nylon and polyolefin (proprietary compatibilizer)... 

The introduction of the reactive oxazoline group into the triphosphazene ring has been achieved by the reaction of (NPC s and 2-(4-hydroxyphenyl)-2-oxazo-line, giving a hexasubstituted product (151).The reactivity of the oxazoline entities in (151) could be demonstrated by reaction with 4-benzoylbenzoic acid [formation of the photosensitive cyclophosphazene (152)] by the reactive blending with poly(ethylene terephthalate), and the compatibilizing activity for polycarbonate - polyamide blends. ... 

SBS with Polycarbonates (PC) Similarly to blends of SBS with PA or PEST, these with PC were first described in 1976. However, owing to weak interactions between SBS and PC, these systems require compatibilization. Thus, either SBS must be acidified (e.g., with SEBS-MA), or acidified acrylate added, viz. MABS, MBS, SMA, etc. Selected examples are listed in Table 1.26. 

Brief reviews covering redistribution reactions in polyester and in polycarbonate binary blends have been prepared by Porter et al. [1989] and Porter and Wang [1992]. Selected references for redistribution processes in PEST/PEST blends are listed in Table 5.7. Early studies of these processes focused on measuring the extent of redistribution under specific processing conditions rather than on producing compatibilized polymer blends with an attractive balance of properties. A number of more recent studies have reported the limits of miscibility for certain melt-mixed polyester pairs in the absence of transesterification — see for example the NMR study of PC/PET blends [Abis et al., 1994]. 

At present, there is only one commercial source of the polyamide/polycarbonate blends (Dexcarb , Dexter Corp.). According to their patent, the blend was compatibilized by using a combination of a polyesteramide elastomer and a maleated olefinic polymer, such as male-ated polypropylene or EP rubber [Perron, 1984 1988]. However the degree or the efficiency of compatibilization achieved is unknown, since the added components are not known to be miscible or compatible with the polycarbonate. Nevertheless, the data sheet indicated good properties including a high notched Izod impact strength of > 700 J/m (Table 15.24). 

Several research investigations have been made to compatibilize PET or PBT with PPE both by reactive and non-reactive routes of compatibiliza-tion [Brown et al., 1990 and 1991 Akkapeddi and VanBuskirk, 1992]. Compatibilized binary blends of PPE/polyesters still lacked adequate toughness and invariably required the addition of rubbery impact modifiers (reactive or compatible type) and polycarbonate. The addition of polycarbonate presumably suppresses the crystallization of the thermoplastic PET or PBT phase, due to its... 

Modification of Engineering Resins Specific interaction of the phosphonium ionomer from Exxpro elastomer with selected engineering resins such as Polycarbonates(PC), Polyesters(PET), Polyacrylates(PAE), Polyamides(PA), Polyphenylene Oxide(PPO), and Acetals(PAc) can be utilized to compatibilize, impact modify or nucleate the above resin in blends with similar polymers. Typical examples are ... 

Patented or commercial polymer blends are in most cases multiphase, compatibilized systems. In the old but still popular blends of polyvinyl chloride or polycarbonate with acrylonitrile-butadiene-styrene copolymer, PVC/ABS or PC/ABS, the styrene-acrylonitrile copolymer, SAN, ascertains adequate compatibilization in the systems. Note that ABS went through a series of process and composition modifications to enhance performance in blends. 

Polyester-polyolefin copolymer compatibilizers have been made through catalyzed or thermal transesterification of polyester or polycarbonate or polyestercarbonate main-chain ester linkages with pendent ester or acid groups (acidolysis) in a polyolefin copolymer such as EVAc or EMAA (Table 5.34). In a separate example. 

Polycarbonate has been blended with commercial polyamides (PA-66 and PA-6), in order to improve its poor solvent resistance while maintaining a reasonable level of heat resistance and toughness. However, simple blends of polycarbonate and polyamides were highly incompatible and hence not useful. Several different additives such as phenoxy resins, polyester amide elastomers in combination with maleated polyolefins, polyetheramide block copolymers, and polyamide-polyacrylate block copolymers have been used as potential compatibilizers and impact modifiers. 

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