Methylene terephthalates

There has been considerable interest in the structure and properties of poly(tetra-methylene terephthalate) 4GT, stemming from the observation that when the oriented polymer is stretched, the crystalline regions are transformed from one structure to a new one30,3l). It appears from the X-ray diffraction data that in the structure... 

The above-mentioned results of the SSP of PET can be generally applied to other semicrystalline polyesters, such as poly(butylene terephthalate) (PBT), poly(tri-methylene terephthalate) PTT), polyethylene naphthalate) (PEN) or any other kind of semicrystalline co-polyester, as a result of their similar reaction behaviors. Most of the studies have been focused on PET and PBT due to their industrial importance. Meanwhile, the popularity of PEN is growing on account of the outstanding properties of this particular polymer. 

Figure 7.1 Effect of CHDM cis/trans ratio on the melting points of poly(1,4-cyclo-methylene terephthalate)s...

Figure 12.4 Structures of polyesters with longer aliphatic chains (a) poly(tri-methylene terephthalate) (PTT) (b) poly(tetramethylene terephthalate) (PBT)...

Auerbach, A. B. and Sell, J. W., Evaluation of poly(l,4-cyclohexylenedi-methylene terephthalate) blends for improved processability, Polym. Eng. Set, 30, 1041 (1990). 

Minnick, L. A., Molding compositions based on poly(l,4-cyclohexylenedi-methylene terephthalate) containing an amide crystallization aid, US Patent 4 894 404, 1988. 

POLYCYCLO-ITEXYLENE-Dl METHYLENE TEREPHTHALATE. PCT is 1,4-cyclohexvlene-dimethylene terephthalate and is a high-temperature. semicrystalline thermoplastic polyester. PCT possesses excellent thermal properties. Injection molding is the predominant method of processing glass fiber-reinforced grades of PCT. It is widely used for... 

Abstract. Three independent determinations have been made of the crystalline structure of the a-phase of poly (tetra-methylene terephthalate). The data on which these determinations have been based are used to asses the contributions to the uncertainties of the structural parameters caused by errors in the unit cell parameters, structure factors, and bond parameters. The effects of differences in the model from which refinement is started are also assessed. The major contribution to uncertainty arises from errors in the structure factors (the "R-factor" between structure factor sets from two different laboratories can be greater than 20%) but errors in bond parameters also make a sizeable contribution. Hamilton s test indicates that one of the structure factor sets used in this study is less inaccurate than the other two and using this the best model satisfying all the other data is estimated together with the uncertainties in its parameters. 

The temperature independent relaxation time (t0) is also affected by the spacer length. The data of the liquid crystalline main-chain polyethers are in agreement with the data by Farrow et al. (291 on semicrystalline poly(methylene terephthalate) polymers. 

Although the dynamic mechanical properties and the stress-strain behavior iV of block copolymers have been studied extensively, very little creep data are available on these materials (1-17). A number of block copolymers are now commercially available as thermoplastic elastomers to replace crosslinked rubber formulations and other plastics (16). For applications in which the finished object must bear loads for extended periods of time, it is important to know how these new materials compare with conventional crosslinked rubbers and more rigid plastics in dimensional stability or creep behavior. The creep of five commercial block polymers was measured as a function of temperature and molding conditions. Four of the polymers had crystalline hard blocks, and one had a glassy polystyrene hard block. The soft blocks were various kinds of elastomeric materials. The creep of the block polymers was also compared with that of a normal, crosslinked natural rubber and crystalline poly(tetra-methylene terephthalate) (PTMT). 

Polytri methylene terephthalate Vinylidene chloride/methyl acrylate copolymer fiber, natural food Wheat (Triticum vulgare) bran fiber, natural pharmaceuticals Wheat (Triticum vulgare) bran fiber, natural supplements Wheat (Triticum vulgare) bran fiber, nonwoven fabrics Polyethylene terephthalate... 

Polytri methylene terephthalate yarn, monofilament Polytri methylene terephthalate yarn, nonwovens Polytri methylene terephthalate yarn, textiles... 

Ward IM, Wilding MA, Brody H (1976) Mechanical-Properties and structure of poly(meta-methylene terephthalate) Fibers. J. Poly. Sci., Pol. Phy. 14 263-274 WiUdns AE, Lowe DJ (2004) Product removal process for use in a biofermentation system. US Patent 6,812,000... 

On paper at least, the simplest of the PAT is poly(methylene terephthalate) ... 

Polytetra-methylene terephthalate Styragel columns HFIP with RI Polystyrene standarc No reported MW... 

Pyda M, Wunderlich B (2000) Reversible and Irreversible Heat Capacity of Poly(tri-methylene Terephthalate) Analyzed by Temperature-modulated Differential Scanning Calorimetry. J Polymer Sci, Part B Polymer Phys 38 622-631. 

As often happens in technology, use of PBT as a solution to the PET molding problems occurred to other investigators at about the same time as It did at Celanese. Based on the studies of poly(methylene terephthalates) carried out in the mid 60 s by Smith, Klbler and Sublett [10], glass reinforced PBT was Independently developed at Tennessee Eastman [11]. However, the... 

Studies on the amorphous state of 2GT have beoi restricted to Brillouin scattering and DSC studies on changes of the amorphous state afforded by heat treatment below the glass transition temperature. Broad line n.m.r. studies and dynamic mechanical behaviour of some aromatic polyesters have been reported and the data related to the transition behaviour in these systems." The thermal behaviour, mechanical properties, and supramolecular texture in polyOiexa-methylene terephthalate)-poly(oxytetramethylene) block copolymer systems has been compared to that of the homopolymers and related to composition and phase separation morphology."- ... 

I. M. Ward, M. A. Wilding and H. Brody, The Mechanical properties and structure of polyfm-methylene terephthalate) fibers, J. Polym. Sci., Polym. Phys. Ed., 14 263-274,1976. 

The poly(x-methylene terephthalates) prepared by melt-phase polymerization under reduced pressure (16) are readily available. These compounds are made up of deformable x-methylene segments alternated with rigid terephthaloyl residues. The only degrees of freedom are within the methy-lenic section of the polymer. 

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