Transitions and relaxations of linear polyesters related to poly(ethylene terephthalate). I. Melting

Abstract

SynopsisObservations obtained by other techniques were confirmed by DSC analyses. As the length of the methylene chain increased, T, decreased, and crystallinity, heat capacity, and heat of fusion increased. The T, and crystallinity of the isophthalate esters were lower than for the corresponding terephthalate esters. The values for an odd-numbered methylene sequence were lower than for the adjacent even-numbered members. A model was used to calculate the heat of fusion of theoretically 100% crystalline poly(hexamethy1ene isophthalate) and poly(decamethy1ene isophthalate).

The effect of a magnetic tape coating process on the structure and properties of a semi-crystalline polymer

“…Plots of tan 6 as a function of temperature for the uncoated films in Figure 3 show the c~ and// transitions of PET that have also been observed by other investigators at approximately 115~ and -50 ~ respectively [12,13]. For our samples, another transition is observed near 50 ~ for the virgin film which may be associated with the frozen-in strain as has been reported in the work of Yip and Williams [14]. On passing through the dryer this transition tions.…”

Synthesis and crystallinity of poly(butylene 2,5-furandicarboxylate)

“…The melting temperature (T m ) of PBF was measured to be about 170 C (Fig. 3 and Supporting Information Figure S9), which is lower than that of PBT (by about 40 C) [42]. The polyester PBF was semicrystalline when it was prepared.…”

Biobased furandicarboxylic acids (FDCAs): effects of isomeric substitution on polyester synthesis and properties

“…Unfortunately, since poly(ethylene phthalate) or PEP is reported to be amorphous, 15 no comparison can be made with this structural analogue. While no literature value is known for the heat of fusion of poly(ethylene isophthalate) (PEI), reported values for poly(butylene isophthalate) or PBI differ strongly, ranging from 115 to 192 J g −1 , 42,43 which makes it nearly impossible to compare.…”