Synthesis of Biodegradable Poly(butylene terephthalate)/poly(ethylene glycol) (PBT/PEG) Multiblock Copolymers and Preparation of Indirubin Loaded Microspheres

Molecular dynamics and crystallization in polymers based on ethylene glycol methacrylates (EGMAs) with melt memory characteristics: from linear oligomers to comb-like polymers

“…Table 1 Values of interest from the DSC measurements regarding scan 1, scan 2 and TMDSC: glass transition temperature, T g , heat capacity change during glass transition, Dc p , crystallization temperature and enthalpy, T c and DH c , respectively, crystalline fraction estimated from DH c and comparison with the heat of fusion of poly(ethylene glycol) (197 J g À1 ) 36 and melting temperature and enthalpy, T m and DH m , respectively. Included are values for the average molecular weight, M w , and the length of OEGMA (or side-chain/branch in POEGMA), This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.…”

Microstructure and Mechanical/Elastic Performance of Biobased Poly (Butylene Furanoate)–Block–Poly (Ethylene Oxide) Copolymers: Effect of the Flexible Segment Length

“…What is also important is that PEO is commercially available as the biobased product by Acme-Hardesty Co., received from the fibrous wastes that remain after sugar cane stalks processing [22]. PEO was previously used for the synthesis of block copolymers combining with petroleum-based aromatic polyesters like poly (ethylene terephthalate) [23,24], poly (butylene terephthalate) [25][26][27], and poly (trimetylene terephthalate) [28][29][30][31][32]. In general the materials revealed the tendency to phase separation depending on the segments' ratio, modified but acceptable thermal and mechanical properties as compared to the polyester homopolymer, and particularly interesting CO 2 permeability and selectivity for gas separating membranes' applications [25,33].…”

“…The reaction proceeded in the temperature range 150 to 160 • C within about 2 h. When~80% of the theoretical amount of methanol was distilled out, the reaction temperature was gradually raised, and an appropriate amount of PEO (depending on the PBF to PEO segment ratio), together with the second part of the catalyst and antioxidant (0.5 wt % in relation to the copolymer final mass), were added into the reaction mixture. The second stage, melt polycondensation, was carried out under reduced pressure (25)(26)(27)(28)(29)(30), in the temperature range of 230 to 240 • C, and monitored via gradual increase of the stirrer torque. The same process parameters were applied for all synthesized materials, and the whole reaction lasted 5-6 h in total.…”

Enzymes as Enhancers for the Biodegradation of Synthetic Polymers in Wastewater

“…Generally, the utilization of household products results in the release of PET‐PEO polymers through sewage systems to wastewater treatment plants (WWTPs), at which these polymers should be degraded. However, the efficiency and knowledge of the biodegradation of PET‐PEO polymers in WWTPs is today limited . PET‐PEO polymers contain two types of potentially degradable chemical bonds, namely, ester bonds and ether bonds.…”

“…However,t he efficiency and knowledge of the biodegradation of PET-PEO polymers in WWTPs is today limited. [6][7][8][9] PET-PEO polymers contain two types of potentially degradable chemical bonds, namely,e ster bonds and ether bonds. Ester bonds are susceptible to hydrol-ysis, whereas ether bonds are mainly degraded by oxidation.…”