Engineered plastics Composites

Vjdyne Engineering Plastic Composite Data Sheet, 6313-E, Monsanto Co., St. Louis, Mo. 

After resolving the incompatibility and dispersion issues between hydrophilic cellulose and mostly hydrophobic matrix in order to increase the mechanical performance of resulting composites up to a satisfactory level (not equal to glass fiber-reinforced engineering plastic composites) [10], mainly through surface chemistry, it appears essential to evaluate the fate of product at the end of its use or start of disposal [11]. It has been addressed during the comparison of synthetic and bio-fibers in more detail, that the total replacement of glass fibers... 

As the properties of LC polyesters can be used for most of the applications from engineering plastics/composite/blend to optical data recording, the research on this material for furthering its applicability is expected to continue for years to come. New LC polyesters are also being reported. 

Inorganic whiskers, a kind of single crystal fibrous or needle-like material that appeared in recent years, are used to reinforce thermosetting resin, thermoplastic resin, rubber, metal, and ceramics through filling and to prepare advanced engineering plastic, composite materials, adhesive, sealant, and paint. The excellent performances of inorganic whiskers have led to their wide application as composite materials- ... 

Copolymers are typically manufactured using weU-mixed continuous-stirred tank reactor (cstr) processes, where the lack of composition drift does not cause loss of transparency. SAN copolymers prepared in batch or continuous plug-flow processes, on the other hand, are typically hazy on account of composition drift. SAN copolymers with as Httle as 4% by wt difference in acrylonitrile composition are immiscible (44). SAN is extremely incompatible with PS as Httle as 50 ppm of PS contamination in SAN causes haze. Copolymers with over 30 wt % acrylonitrile are available and have good barrier properties. If the acrylonitrile content of the copolymer is increased to >40 wt %, the copolymer becomes ductile. These copolymers also constitute the rigid matrix phase of the ABS engineering plastics. 

Not only ate ABS polymers useful engineering plastics, but some of the high mbber compositions are excellent impact modifiers for poly(vinyl chloride) (PVC). Styrene—acrylonitrile-grafted butadiene mbbers have been used as modifiers for PVC since 1957 (87). 

Eubricomp Intemallj Rubricated Reinforced Thermoplastics and Fluoropoljmer Composites, Bulletin 254—688, ICI Inc., LNP Engineered Plastics, Malvern, Pa., 1988. 

Resins for advanced composites can be classified according to their chemistry typical resins are polyaryletherketones, polysulfides, polysulfones, and a very broad class of polyimides containing one or more additional functional groups (Table 2) (see also Engineering plastics). 

Strong elongational deformation and use of matrix polymers whose viscosity is higher than that of TLCP phase are better to ensure uniform and fine fibril formation. But application of compatibilizing techniques to in situ composite preparation can be useful to get the most desirable products. These can reduce the high costs of the liquid crystalline polymers and expensive special engineering plastics used for the in situ composite preparation and reduce the processing cost, whereas they can increase the performance of produced in situ composites, hence, their applications, too. 

Plastic also refers to a material that has a physical characteristic such as plasticity and toughness. The general term commodity plastic, engineering plastic, advanced plastic, advanced reinforced plastic, or advanced plastic composite is used to indicate different performance materials. These terms and others will be reviewed latter in this chapter. Plastics are made into specialty products that have developed into major markets. An example is plastic foams that can provide flexibility to rigidity as well as other desired properties (heat and electrical insulation, toughness, filtration, etc.). 

PLASTEC. The Plastics Technical Evaluation Center (PLASTEC) is one of approximately 20 technical information analysis centers sponsored by the US Dept of Defense (DoD) to provide the defense community with a variety of authoritative information services. Located at the Armament Research Development Command -(ARRADCOM), Dover, NJ, PLASTEC has been serving this community since 1960 via state-of-the-art reports, handbooks, newsletters, current awareness studies, engineering assistance, bibliographies, literature searches, technical inquiries and special investigations on plastics, composites and adhesives... 

Apart from PVC and other commodity plastics, engineering plastics and wood-plastic composites are used for specific advantages corresponding to specific applications. 

These very dissimilar parts used for very different functions, from small parts without any special features up to electrical generators, consume significant shares of engineering plastics and composites, as we can see in Table 2.33. 

The properties of unidirectional composites in the fibre direction can compete with those of current metals and alloys. The highest-performance engineering plastics compete with magnesium and aluminium alloys. 

The discovery that several controlling factors in decay of polysaccharide -plastic composites are physico-chemical in nature (rather than environmental or biological) should make it possible to develop an accurate simulation model to define structural and biodegradable boundaries to achieve the best balance between the two conflicting requirements. This type of model would facilitate development of materials that are satisfactory by both engineering and biodegradability criteria a model of this type is currently being developed in my laboratory. 

Kapton - [ENGINEERING PLASTICS] (Vol 9) - [HEAT-RESISTANT POLYMERS] (Vol 12) - [PHTHALIC ACID AND OTHERBENZENEPOLYCARBOXYLIC ACIDS] (Vol 18) - [POLYMIDES] (Vol 19) -as composite matrix [COMPOSITE MATERIALS - POLYMER-MATRIX - THERMOPLASTICS] (Vol 7) -ion implantation m [ION IMPLANTATION] (Vol 14)... 

Wiri lrnis. W.A. Engineering Plastics and Composites. 2nd Edition. ASM International, Maierials Park. OH. 1993. 

Polyoxyethylene. Synthetic polymers with a variety of composition-ally similar chemical structures are as follows. Based on polarity, poly(oxymethylene) (1) would be expected to be water soluble. It is a highly crystalline polymer used in engineering plastics but it is not water-soluble. Polyoxypropylcnc (PPO) (2) and poly(mcthyl vinyl ether) (PYlVE) (3) have... 

The most successful application of the RIM-process is in the production of polyurethane-based materials. Other systems, such as composites based on polycaproamide, epoxy resins, and unsaturated polyesters can also be processed by reactive injection molding. New reactive systems have also been specially created for the RIM-process260 because of the exceptional opportunities it offers for manufacture of finished articles from engineering plastics with a high modulus of elasticity and impact strength. The automotive industry, which is the main customer for RIM-articles, can utilize this technology to manufacture of massive parts such as body panels, covers, wings, bumpers and other made of newly developed plastics. 

---