Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Reactive processing compatibilization

Bhowmick A.K., Chiba T., and Inoue T., Reactive processing of rubber-plastic blend Role of a chemical compatibilizer, J. Appl. Polym. Sci., 50, 2055, 1993. [Pg.156]

Note Compatibilization may be achieved by addition of suitable copolymers or by chemical modification of interfaces through physical treatment (i.e., irradiation or thermal) or reactive processing. [Pg.192]

Reactive Processing of Multicomponent Immiscible and Compatibilized Immiscible Polymer Systems, 632... [Pg.603]

REACTIVE PROCESSING OF MULTICOMPONENT IMMISCIBLE AND COMPATIBILIZED IMMISCIBLE POLYMER SYSTEMS... [Pg.632]

In the blends discussed above, the interaction among the components and the compatibilizing agent is purely physical. However, to extend the range of possibilities for optimized blends preparation, reactive processing, where covalent chemical bonds are created between the partners, offers great potential. [Pg.438]

If chemical reaction can take place between the functional groups on the compatibilizer and the two phases, then this will result in high interfacial adhesion and the miscibility is important only insofar as the reacting groups need to approach one another in order to enable reaction. Often this functionalization is achieved in a separate reactive-processing step, such as the grafting of maleic anhydride to polyolefins. Scheme 1.48 (Moad, 1999). [Pg.123]

Compatibilization during reactive processing, extrusion or injection molding. [Pg.12]

To toughen PA, 2-5 wt% of either PO, elastomer, ionomer, acidified or epoxidized copolymer may be added. PA/PO blends of type (2) were developed to improve dimensional stability and to reduce water absorbency of PA. Alloying PA with PO reduces the rate of water migration to and from the blend, but not the inherent water absorption of PA [Utracki and Sammut, 1991, 1992]. The alloying is either a two- or three-step reactive process (1°) acidification of PO, (2°) preparation of a compatibilizer, and (3°) compounding PP, PA, and the compatibilizer. Usually, the reactive blending is carried out in a twin screw extruder [Nishio et al., 1990 Hu and Cartier, 1998], Since it may cause reduction of the blend crystallinity (thus performance), the extend must be optimized. The rigid PA/PP blends usually comprise PA PP =... [Pg.59]

Poly(styrene-co-maleic anhydride) (SMA) is frequently mixed with SAN before the reactive blending with PA [Takeda and Paul, 1992]. Much attention has been paid to morphology control during the reactive processing [Serpe et al, 1990 Campbell et al., 1990 Willis and Favis, 1990]. Frequently, a third polymer is added as a com-patibilizer for binary systems, e.g., MA-grafted SEES to compatibilize (and impact-modify) blends of PE with PET [Carte and Moet, 1993]. [Pg.569]

The term reactive processing is used to describe a polymer processing that involves chemical reactions. In principle, any processing operation can be conducted as a reactive process, viz. reactive injection molding (RIM). However, most often the term refers to reactive extrusion, and in particular, to the reactive compatibilization of immiscible polymer blends, usually conducted in a TSE. During the last 50 years, the latter machines have been used as chemical reactors for the polymerization, depolymerization (chemical recycling), polymer modification and compatibilization [Brown, 1992, Xanthos, 1992 Utracki, 1989, 1991, 1994, 1997]. [Pg.631]

Reactive processing combines fine polymer chemistry with polymer processing. Thus, development of the reactive compatibilization process involves ... [Pg.633]

In commercial blends, the morphology is normally stabilized by the addition of a compatibil-izer or by inducing its formation during reactive processing. Particles grafted to the matrix are less... [Pg.668]

One way to achieve compatibilization involves physical processes such as shear mixing and thermal history, which modify domain size and shape. The second way is the use of physical additives to increase attraction between molecules and phases. The third method is reactive processing, which is used to change the chemical structure of one or more of the components in the blend and thus increase their attraction to each other. Table 1.5 contains a list of compatibilizers used in the formulation of polyolefin blends. As can be seen from Table 1.5, most of the compatibilizers used in the formulation of polyolefin blends contain compounds such as maleic anhydride, acrylic and methacrylic acid, glycidyl methacrylate, and diblock and triblock copolymers involving styrene, ethylene, and butadiene. [Pg.14]

A more advantageous alternative is to prepare compatibUized PA/PO blends, like many other types of blends, by reactive processing that implies creation of composites with a required level of interphase interaction in situ during compounding (18). Grafted polymers, whose macromolecules contain necessary functional groups, are most often used as compatibilizers. [Pg.530]

Reactions between anhydride and amino groups predominate in the formation of grafted copolymers that are obtained during reactive processing in the presence of anhydride-containing compatibilizers (41,43 5). [Pg.532]

The patent literature also provides information on means of achieving these goals. As Table 4.36 indicates, the blending effect in most case is nonspecific. Therefore, the data in Table 4.36 should only be considered as a general guide to blending. The fact that two polymers with desired properties are immiscible should, however, not be a deterrent since the modern compatibilization and reactive processing methods (discussed later) can overcome such problems. [Pg.531]

Compatibilizer Polymer or copolymer that either added to a polymer blend or generated there during reactive processing modifies its interfacial character and stabilizes the morphology... [Pg.20]

From the economic as well as the performance points of view, the reactive compatibilization is most interesting (see Chap. 5, Reactive Compatibilization ). The process involves (i) sufficient dispersive and distributive mixing to ascertain required renewal of the interface (ii) presence of a reactive functionality, suitable to react across the interphase (iii) sufficient reaction rate making it... [Pg.24]


See other pages where Reactive processing compatibilization is mentioned: [Pg.654]    [Pg.671]    [Pg.297]    [Pg.243]    [Pg.582]    [Pg.607]    [Pg.635]    [Pg.105]    [Pg.125]    [Pg.298]    [Pg.208]    [Pg.296]    [Pg.452]    [Pg.515]    [Pg.577]    [Pg.631]    [Pg.212]    [Pg.531]    [Pg.296]    [Pg.454]    [Pg.472]    [Pg.429]    [Pg.90]    [Pg.108]    [Pg.369]    [Pg.201]    [Pg.80]    [Pg.122]    [Pg.449]   
See also in sourсe #XX -- [ Pg.13 ]




SEARCH



Compatibilization

Compatibilization process

Compatibilizers

Compatibilizing

Processes reactive

Reactive compatibilization

Reactive processing

Reactive processing compatibilized systems

© 2024 chempedia.info