Noryl* PPS+PPE

Poly(ethylene naphthalate)-Poly(ethylene terephthalate), 380 Noryl PPS+PPE Poly(phenylene sulflde), 198... 

The scratch resistance of polypropylene was improved by blending 20 wt% PPE/HIPS blend (Noryl PX0844) as a modifier and 5 % styrene-ethylene/ propylene diblock copolymer (Kraton G) as a compatibilizer (Sue 2001, 2002). It appears that the fracture energy dissipation in the PP matrix occurs by craze promotion around the dispersed particles of PPE/HIPS blend and thus preventing crack formation, while the compatibilizer promoted the PP/PPE interfacial adhesion. 

Blends of polymers are manufactured and applied at an increasing scale. Only in exceptional cases are polymers soluble in each other and can form a homogeneous blend (an example PPE + PS, a blend known as Noryl ). In most cases blends are, therefore, dispersions. Rubber particles are dispersed in brittle polymers to improve their impact strength (toughened PS and PP, ABS etc.), but also hard polymers are combined to reach a favourable compromise between properties (and price). 

Several approaches to compatibilizing PPE blends with commercial polyolefins (polypropylene, etc.) have been reported in the literature (Lee 1990 Kirkpatrick et al. 1989). Simultaneous compatibilization and impact modification of PPE/polypropylene blends was achieved by choosing selected types of styrene-ethylene/butylene-styrene block copolymers and PPE resin of low molecular weight (Akkapeddi and VanBuskirk 1992). A family of PPE/polypropylene alloys were commercially launched by G.E. in 2001, under the Noryl PPX trade name, and these are now sold by Sabic. Typical properties of a commercial PPE/PP blend are shown in Table 19.32. These PPE/PP blends are claimed to offer a balance of cost and performance between the TPOs and other higher-cost engineering thermoplastics such as nylons, modified PET, and PBT resins. Basically, the PPE/PP blends offer a balance of key properties stiffness, toughness, chemical, and heat resistance. 

In the automotive area, short glass fiber-filled PPE/PP blends are used for front-end modules, seat backs, load decks, and underhood parts. PPE-PP blends were also evaluated as a thermoplastic matrix for continuous glass-mat reinforced composites. GM s Chevy Volt concept electric car featured light-weight, compression-molded thermoplastic composite hood and door panels, the core of each panel being made from low-density glass mat (Azdel) reinforced Noryl PPX grade PPE/PP blend (EV world 2007). 

In 2001, PPE/PP alloys were commercialized under the Noryl PPX designation. This new alloy creates a market niche between engineering thermoplastics and high-performance polyolefins. PPE/PP alloys offer product designers materials that fill the gap between the basic properties of high-end polyolefins and the stronger performance characteristics and attributes of engineering thermoplastics. 

The Noryl PPX resin portfoho presently includes unfilled and filled grades. Representative properties of unfilled PPE/PP grades appear in Table 9.12. Key features of these grades include... 

Figure 5.35 Tensile stress amplitude versus cycles to failure at 23°C of SABIC Innovative Plastics Noryl PPX615—15% glass fiber-reinforced, impact-modified PPE/PP (polypropylene) plastic [12].

---