Poly(Ether/Ester)s based on poly(tetramethylene terephthalate) and poly(ethylene glycol), 3. Effect of thermal treatment and drawing on the structure of the poly(ether/ester)s

Abstract

2341Poly(ether/ester)s based on poly(tetramethy1ene terephthalate) and poly(ethy1ene glycol), 3 a) SUMMARY:Annealed drawn and undrawn bristles of poly(ether/ester)s based on poly(tetramethy1ene terephthalate) (PTMT) and poly(ethy1ene glycol) PEG lo00 (in various ratios) are studied by means of small-angle X-ray scattering and differential scanning calorimetry (DSC). The samples with the lowest PTMT content (49 wt.40 PTMT) show on abrupt increase of the scattering intensity and the long spacing with increasing annealing temperature T,, this increase becoming less pronounced with increasing fraction of hard segment (PTMT). The DSC heating scans are characterized by a low-temperature glass transition due to the soft polyether segments and a multiple melting behaviour at about 200 O C due to the crystalline hard FTMT segments. The data suggest a dependence of the thermal behaviour on the chemical composition, annealing temperature, and orientation. The characteristics of the undrawn samples are similar to those of the homopolyester PTMT and the copolymers based on PTMT and poly(tetramethy1ene oxide). Evidence is found for an increase of phase separation with an increase of the annealing temperature. The formation of larger amorphous regions of PEG with increasing T, determines the thermal and scattering behaviour observed.

Utility of Chemical Upcycling in Transforming Postconsumer PET to PBT-Based Thermoplastic Copolyesters Containing a Renewable Fatty-Acid-Derived Soft Block

“…Even highly incompatible segments would not be expected to extensively microphase separate with very low block molar mass (i.e., low segregation strength). Thus, a single T g is in line with a single-phase system and the relative positions of the glass transitions are proportional to the relative T g of the homopolymers of PET (+80 °C; Figure S6) and PBT (+60 °C) . Increasing FADD content, being relatively flexible, leads to decreasing glass transition temperatures in both series of TPCs.…”

“…Thus, a single T g is in line with a single-phase system and the relative positions of the glass transitions are proportional to the relative T g of the homopolymers of PET (+80 °C; Figure S6 ) and PBT (+60 °C). 51 Increasing FADD content, being relatively flexible, leads to decreasing glass transition temperatures in both series of TPCs. The contrasting thermal properties between the two series of copolyesters reveal important implications about the suitability for different applications.…”

Synthesis and characterization of thermoplastic copolyester elastomers modified with fumaric moieties

“…Some modifications with isophthalic acid or phthalic acid were used in order to optimize the mechanical properties. Poly(ether-ester)s based on PBT and poly(ethylene oxide) (PEO) [8][9][10] have been shown to have generally worse characteristics than those containing PTMO as the soft segments, but also to have some advantages, the most important being their hydrophilic character, which makes them attractive candidates for application in the textile industry. The resistance to hydrolytic and thermal degradation increased when poly(hexamethylene oxide) and poly(decamethylene oxide) were introduced as the soft segments.…”