scholarly journals Thermal properties of MECDP copolyesters

2012 ◽  
Vol 16 (5) ◽  
pp. 1456-1459 ◽  
Author(s):  
Ming-Liang Zhao ◽  
Yuan Liu ◽  
Fa-Xue Li ◽  
Xue-Li Wang ◽  
Yu Gao ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Thermal Degradation ◽  
Ethylene Glycol ◽  
Poly Ethylene Glycol ◽  
Scanning Calorimetry ◽  
Degradation Temperature ◽  
Poly Ethylene Terephthalate ◽  
Oxygen Condition ◽  
Poly Ethylene ◽  
Temperature Melting

MECDP copolyesters based on poly(ethylene terephthalate) were prepared with sodium-5-sulfo-bis-(hydroxyethyl)-isophthalate and poly(ethylene glycol) units as modifiers. Thermal properties of these copolyesters were characterized by differential scanning calorimetry and thermal gravity analyzer. Experimental results indicated that glass transition temperature, melting temperature and thermal degradation temperature reduced with increasing the poly(ethylene glycol) content. The incorporation of poly(ethylene glycol) increased the flexibility and irregularity of molecular chains which led to lower crystallinity, and bought more ether bonds into molecular chains. Besides, the thermal degradation under oxygen condition happened easily compared to that under nitrogen condition.

Solid-State Grafting of Poly(ethylene glycol) onto Alginic Acid

2014 ◽  
Vol 1060 ◽  
pp. 180-183
Author(s):  
Siti Salimah Mohamad Ismail ◽  
Chan Chin Han ◽  
Tin Wui Wong
Keyword(s):  
Ethylene Glycol ◽  
Alginic Acid ◽  
Carboxyl Group ◽  
Amino Group ◽  
Poly Ethylene Glycol ◽  
Scanning Calorimetry ◽  
Degradation Temperature ◽  
Rate Of Reaction ◽  
Poly Ethylene ◽  
Kinetics Of

Melt reaction of poly (ethylene glycol) and alginic acid (guluronate-rich and mannuronate-rich) was studied. The poly (ethylene glycol) was end-capped with reactive amino group while the sodium alginate was converted to alginic acid before melt reaction. The melt reaction kinetics of poly (ethylene glycol) and alginic acid were monitored by differential scanning calorimetry. The reaction temperatures were ranged between 75 and 96 °C, below the degradation temperature of both parent polymers. The reactive amino group of poly (ethylene glycol) reacted with carboxyl group of alginic acid. The rate of reaction increased with reaction temperature.

scholarly journals Tailoring Atomoxetine Release Rate from DLP 3D-Printed Tablets Using Artificial Neural Networks: Influence of Tablet Thickness and Drug Loading

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 111
Author(s):  
Gordana Stanojević ◽  
Djordje Medarević ◽  
Ivana Adamov ◽  
Nikola Pešić ◽  
Jovana Kovačević ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Release Rate ◽  
Drug Loading ◽  
Prolonged Release ◽  
Cylindrical Shape ◽  
Poly Ethylene Glycol ◽  
Scanning Calorimetry ◽  
3D Printed ◽  
Artificial Neural ◽  
Poly Ethylene

Various three-dimensional printing (3DP) technologies have been investigated so far in relation to their potential to produce customizable medicines and medical devices. The aim of this study was to examine the possibility of tailoring drug release rates from immediate to prolonged release by varying the tablet thickness and the drug loading, as well as to develop artificial neural network (ANN) predictive models for atomoxetine (ATH) release rate from DLP 3D-printed tablets. Photoreactive mixtures were comprised of poly(ethylene glycol) diacrylate (PEGDA) and poly(ethylene glycol) 400 in a constant ratio of 3:1, water, photoinitiator and ATH as a model drug whose content was varied from 5% to 20% (w/w). Designed 3D models of cylindrical shape tablets were of constant diameter, but different thickness. A series of tablets with doses ranging from 2.06 mg to 37.48 mg, exhibiting immediate- and modified-release profiles were successfully fabricated, confirming the potential of this technology in manufacturing dosage forms on demand, with the possibility to adjust the dose and release behavior by varying drug loading and dimensions of tablets. DSC (differential scanning calorimetry), XRPD (X-ray powder diffraction) and microscopic analysis showed that ATH remained in a crystalline form in tablets, while FTIR spectroscopy confirmed that no interactions occurred between ATH and polymers.

scholarly journals Synthesis and Thermal Properties of Poly(ethylene glycol)-polydimetylsiloxane Crosslinked Copolymers

2018 ◽  
Vol 47 (6) ◽  
pp. 1117-1122
Author(s):  
Ain Athirah Zainuddin ◽  
Rizafizah Othaman ◽  
Wan Syaidatul Aqma Wan Mohd Noor, ◽  
Takeno Akiyoshi ◽  
Takahashi Shinya ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Ethylene Glycol ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

Poly(ethylene terephthalate) copolymers with a smaller amount of poly(ethylene glycol)s and poly(butylene glycol)s

Polymer ◽  
1995 ◽  
Vol 36 (13) ◽  
pp. 2629-2635 ◽  
Author(s):  
Tsuyoshi Kiyotsukuri ◽  
Tsuyoshi Masuda ◽  
Naoto Tsutsumi ◽  
Wataru Sakai ◽  
Minoru Nagata
Keyword(s):  
Ethylene Glycol ◽  
Ethylene Terephthalate ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Thermal Properties of Ester-Type Easy Cationic Dyeable Poly(ethylene Terephthalate) (ECDP) Polymers

2010 ◽  
Vol 44-47 ◽  
pp. 2409-2413 ◽  
Author(s):  
Yu Sun ◽  
Guo Zheng ◽  
Hong Xiang Yang ◽  
Yan Jun Liu ◽  
Xiao Ning Li
Keyword(s):  
Thermal Properties ◽  
Diethylene Glycol ◽  
Ethylene Terephthalate ◽  
Glycol Succinate ◽  
Glycol Adipate ◽  
Scanning Calorimetry ◽  
Poly Ethylene Terephthalate ◽  
Monomer Content ◽  
Diethylene Glycol Succinate ◽  
Poly Ethylene

This study investigated the thermal properties of ester-type easy cationic dyeable poly(ethylene terephthalate) (ECDP) polymers using differential scanning calorimetry (DSC), therogravimetric analysis (TGA). The mass ratios of 5-sodium sulfo bis(-hydroxyethyl) isophthalate(SIPE) for ECDP polymers were 2.8%, 5.5%, 6.8%, respectively. The fourth monomers were diethylene glycol adipate (DGA), diethylene glycol succinate (DGS) and diethylene glycol subacate (DES) with different contents. The results suggested that the Tg of ester-type ECDP decreased with the increasing the molecule weight of the fourth monomer at fixed SIPE and fourth monomer contents. The Tch of ECDP polymer to be lower than that of the CDP polymer with the same SIPE content. And it decreased as SIPE and fourth monomer contents increased, it also decreased with the increasing of the molecule weight of the fourth monomer given the same SIPE content. The effect of the ester-type soft segments reduced the Tm of ECDP. The thermal stability of ECDP polymer was less than PET and CDP polymers, and it decreased with increasing SIPE content, but increased with the ester-type fourth monomer content increasing.

Sign in / Sign up

Export Citation Format

Share Document