Synthesis and characterization of poly(ethylene succinate) and its copolyesters containing minor amounts of butylene succinate

Abstract

Poly(ethylene succinate) (PES) and its copolyesters that contain 7, 10, or 48 mol % butylene succinate (BS) were synthesized through a direct polycondensation reaction with titanium tetraisopropoxide as the catalyst. Measurements of intrinsic viscosity (1.08-1.27 dL/g) proved the success of the preparation of polyesters with high molecular weights. The compositions and the sequence distributions of the copolyesters were determined from 1 H and 13 C NMR spectra. The distributions of ethylene succinate and BS units were found to be random. Their thermal properties were elucidated using a differential scanning calorimeter (DSC) and a thermogravimetric analyzer. No significant difference exists among the thermal stabilities of these polyesters. All of the copolymers exhibit a single glass transition temperature. Wide-angle X-ray diffractograms (WAXD) were obtained from polyesters that were crystallized isothermally. The DSC thermograms and WAXD patterns indicate that the incorporation of BS units into PES significantly inhibits the crystallization behavior of PES. The heat of fusion of ideal PES crystals is 163 J/g, as determined by the depression of the melting point of PES crystals in acetophenone.

Synthesis and characterization of novel poly(butylene succinate-co-2-methyl-1,3-propylene succinate)s

“…These polyesters exhibited no significant difference or trend in these three temperature parameters because they degraded via the same cyclization degradation mechanism around the succinate groups. Similar results have been reported for the other series of aliphatic copolyesters [23,34,45,49]. The values of T loss2% are well above 220ºC, the temperature of the last step of synthesis.…”

“…The agreement of composition among these three methods is good in this study, as shown in Table 2. The randomness B of the copolymer [34,[45][46][47][48][49] is given by B = P(BSM)/(2P BS ·P MS ). Copolyesters synthesized by polycondensation have usually been considered to have a random distribution.…”

“…The reactivities of BD and MPD with SA can be assumed to not differ by much. The average number sequence lengths [33,45,[48][49][50] of BS and MS units are L nBS = 2P BS /P(BSM) and L nMS = 2P MS /P(BSM), respectively. In the case of PBMPSu 50/50, both values were 2.0.…”

Biobased copolyesters from renewable resources: synthesis and crystallization kinetics of poly(propylene sebacate-co-isosorbide sebacate)

“…4,[12][13][14] Over the past few years, most of the effort in making aliphatic polymers and/or copolymers are focused on 1,4-butanediol, ethylene glycol or 1,6-hexanediol. [15][16][17][18][19][20][21][22][23][24][25] However, little attention are paid to the synthesis of polyesters based on 1,3-propanediol due to its low production, extremely high cost, poor ability for stacking in the crystals and poor thermal and mechanical properties. 8,26,27 In recent years, more attractive processes have been developed for the production of 1,3-propanediol by the biotechnological or the environment-friendly methods with a renewable resource.…”

Biodegradable poly(butylene succinate-co-butylene dimerized fatty acid)s: Synthesis, crystallization, mechanical properties, and rheology

“…Cao et al [21] and Chen et al [22] introduced ethylene glycol (C2 diol) to the PBS molecular chain, Nikolic et al [23] introduced adipate (C6 diacid) to the PBS molecular chain synthesized poly(butylenes succinate-co-butylene adipate). Mincheva et al [24] introduced azelate (C9 diacid).…”