Polyester composites preparation

PCT describes a polyester composition prepared from CHDM and DMT (or TPA). The abbreviation PCT is thus derived from the technical name for the polymer, i.e. poly(l,4-cyclohexylenedimethylene terephthalate), or PCT. This material is a highly crystalline, high-melting polyester, with the following structure ... 

Sreekumar PA, Joseph K, Unnikrishnan K et al (2007) A comparative study on mechanical properties of sisal-leaf liber-reinforced polyester composites prepared by resin transfer and compression moulding techniques. Compos Sci Technol 67 453 61... 

Polycarbonates. Polyarjiates are aromatic polyesters commonly prepared from aromatic dicarboxylic acids and diphenols. One of the most important polyarylates is polycarbonate, a polyester of carbonic acid. Polycarbonate composite is extensively used in the automotive industry because the resin is a tough, corrosion-resistant material. Polycarbonates (qv) can be prepared from aUphatic or aromatic materials by two routes reaction of a dihydroxy compound with phosgene accompanied by Hberation ofHCl(eq. 5) ... 

Variation of Equivalent Weight. In an attempt to produce more flexible coatings, the UPE A formulation was modified to increase the equivalent weight by substituting succinic anhydride for a portion of the maleic anhydride. These unsaturated polyesters were prepared by the same method as above and the compositions and their properties are summarized in Table II. 

The selection of monomers for preparation of copolyesters is based on applying established structure/property principles and is usually driven by new market needs and applications with specific end-use properties in mind. Thus, attempts to develop amorphous or semicrystalline CHDM-based polyester compositions for applications requiring greater heat resistance or higher heat deflection temperatures have generally followed the theme of incorporating bulky or rigid constituents to further enhance the desirable thermal properties of CHDM-based... 

In view of the utility of the aromatic polyesters and the demonstrated effectiveness of the aromatic polyphosphonates as flame retardants, the combination of these two polymers was chosen for this study. In addition, this system provided a composition in which both copolymers and polymer blends could be prepared with identical chemical compositions. The polyesters were prepared from resorcinol with an 80/20 m/m ratio of iso-phthaloyl and terephaloyl chlorides while the polyphosphonates were resorcinol phenylphosphonate polymers. Copolymerized phosphorus was incorporated by replacement of a portion of the acid chloride mixture with phenylphosphonic dichloride. 

Two series of aromatic polyester compositions, containing varying levels of phosphorus, were prepared by different methods (a) blending with an aromatic polyphosphonate and (b) copolymerization by incorporation of a phosphonate unit into the polyester backbone. 

Carboxy-terminated oligomeric polyester compositions consisting of resorcinol, terephthalic isophthalic acid, diphenyl carbonate, and terephthalic acid catalyzed by titanium tetrabutoxide were prepared by Brunelle et al. (1) and used as thermosetting applications. 

Polymer characterization. The thermotropic behaviors of the polyester-carbonates prepared were examined under a polarized hot stage microscope (Sybron Co.). Normally the sample became softer at 120-150°C and melted with birefringence afterwards, depending on the molecular weight and composition of the polymer. The samples stayed bire-fringent until 350°c or higher. 

One of the pioneer polyurethane products was a wood flour-filled composite prepared from a hydroxyl terminated polyester and tolylene diisocyanate (TDI) or its dimer (MDI)These composites were also used in solid fuel propellantsiZ and sealants,—... 

The changes of glass transition temperature and melting point with composition of co(polyester)s prepared from 3-benzoyl-4-acetoxybenzoic acid and 4-acetoxybenzoic acid are shown in Table 16.3. 

Tang, B., Huo, Z. and Wu, P. 2008. Study on a novel polyester composite nanofiltration membrane by interfacial polymerization of triethanolamine (TEOA) and trimesoyl chloride (TMC) I. Preparation, characterization and nanofiltration properties test of membrane.. /. Memh. Sri. 320 198-205. 

Khalil et at [36] studied the combination of oil palm fiber and glass fiber as hybrid composite in polyester matrix. Hybrid laminate composites with different weight ratio were prepared to study the hybrid effect of glass and EFB fibers on the physical and mechanical properties of the composites. Generally, the hybrid composites showed better properties as compared to EFB/polyester composites without glass fiber. 

Compositions prepared by treating polyester polyol of dimerethylene glycol with tolylene diisocyanate features good waterproof properties and use as cellular sealing materials [52]. 

---