A biodegradable copolymer from coupling poly(pdioxanone) with poly(ethylene succinate) via toluene-2,4- diisocyanate

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Xiu-Li Wang ◽  
Si-Chong Chen ◽  
Yu-Hua Zhang ◽  
Ke-Ke Yang ◽  
Yu-Zhong Wang
Keyword(s):  
Oxidative Degradation ◽  
Crystallization Rate ◽  
Chain Extender ◽  
Thermal Oxidative Degradation ◽  
The Novel ◽  
H Nmr ◽  
Melting Temperatures ◽  
Diffraction Peaks ◽  
Poly Ethylene ◽  
A Chain

AbstractPoly(p-dioxanone) (PPDO) and poly(ethylene succinate) (PES) prepolymers were reacted together using toluene-2,4-diisocyanate (TDI) as a chain extender to produce high molecular weight of chain-extended products of PPDO and PES (PPDOES) in a suitable reaction condition. The novel biodegradable polymers were characterized by 1H-NMR, DSC, POM and WAXD. DSC measurement shows that PPDOES has only one Tg, which means that PPDO has good compatibility with PES. Beside this, the glass transition temperatures and the melting temperatures of PPDOES increased with the increase of PES content. The crystallization rate of PPDOES was slower than that of PPDO as confirmed by DSC and POM. The diffraction peaks of PPDOES appear at the same 2θ angles as that of homopolymers, suggesting that PPDO and PES segment of the chainextended products reserve their own crystallization form. The results of thermal oxidative degradation show that chain-extended products have better thermal stability than PPDO.

Improving the properties of recycled PET/PEN blends by using different chain extenders

2016 ◽  
Vol 36 (6) ◽  
pp. 615-624 ◽  
Author(s):  
Simge Can ◽  
N. Gamze Karsli ◽  
Sertan Yesil ◽  
Ayse Aytac
Keyword(s):  
Ethylene Terephthalate ◽  
Chain Extender ◽  
Degree Of Crystallinity ◽  
Recycled Pet ◽  
H Nmr ◽  
Loading Level ◽  
Poly Ethylene Terephthalate ◽  
Chain Extenders ◽  
Izod Impact ◽  
Poly Ethylene

Abstract The main aim of this study was to improve the mechanical properties of the recycled poly(ethylene terephthalate)/poly(ethylene 2,6-naphthalate) (r-PET/PEN) blends by enhancing the miscibility between PET and PEN with the usage of chain extenders. This idea was novel for the recycled PET-based r-PET/PEN blends, as investigation of the effects of the chain extender usage on the properties of r-PET/PEN blends has not been studied in the literature, according to our knowledge. 1,4-Phenylene-bis-oxazoline (PBO), 1,4-phenylene-di-isocyanate (PDI), and triphenyl phosphite (TPP) were selected as chain extenders. The maximum tensile strength value was observed for the 1.0PDI sample. Moreover, PDI-based blends exhibited better Izod impact strength when compared with all other samples. The miscibility and degree of crystallinity values of all blends were discussed by means of thermal analysis. 1H-nuclear magnetic resonance (1H-NMR) analysis was carried out to determine transesterification reaction levels. According to 1H-NMR results, the increase in the level of transesterification was around 40% with the usage of PDI. The optimum loading level for selected chain extenders was determined as 1 wt.%, and PDI-based blends exhibited better properties when compared with those of the blends based on PBO and TPP at this loading level.

scholarly journals Insights into the Bead Fusion Mechanism of Expanded Polybutylene Terephthalate (E-PBT)

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 582
Author(s):  
Justus Kuhnigk ◽  
Daniel Raps ◽  
Tobias Standau ◽  
Marius Luik ◽  
Volker Altstädt ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Crystallization Rate ◽  
Chain Extender ◽  
Sufficient Time ◽  
Polybutylene Terephthalate ◽  
Scanning Calorimetry ◽  
Melting Temperatures ◽  
Expandable Polystyrene ◽  
Polymer Interdiffusion ◽  
The Impact

Expandable polystyrene (EPS) and expanded polypropylene (EPP) dominate the bead foam market. As the low thermal performance of EPS and EPP limits application at elevated temperatures novel solutions such as expanded polybutylene terephthalate (E-PBT) are gaining importance. To produce parts, individual beads are typically molded by hot steam. While molding of EPP is well-understood and related to two distinct melting temperatures, the mechanisms of E-PBT are different. E-PBT shows only one melting peak and can surprisingly only be molded when adding chain extender (CE). This publication therefore aims to understand the impact of thermal properties of E-PBT on its molding behavior. Detailed differential scanning calorimetry was performed on neat and chain extended E-PBT. The crystallinity of the outer layer and center of the bead was similar. Thus, a former hypothesis that a completely amorphous bead layer enables molding, was discarded. However, the incorporation of CE remarkably reduces the crystallization and re-crystallization rate. As a consequence, the time available for interdiffusion of chains across neighboring beads increases and facilitates crystallization across the bead interface. For E-PBT bead foams, it is concluded that sufficient time for polymer interdiffusion during molding is crucial and requires adjusted crystallization kinetics.

Poly[( N-Acylimino)ethylene] Derivatives for Advanced Materials

2009 ◽  
Vol 21 (5) ◽  
pp. 596-607 ◽  
Author(s):  
Geta David ◽  
Bogdan C. Simionescu
Keyword(s):  
Phenyl Isocyanate ◽  
Chain Extender ◽  
Advanced Materials ◽  
Inorganic Component ◽  
Poly Ethylene Oxide ◽  
Hard Segments ◽  
Segmented Polyurethanes ◽  
Poly Ethylene ◽  
A Chain ◽  
Tetramethylene Oxide

New segmented polyurethanes containing soft and hard segments of different polarity and hydrophilicity, based on 4,4′-methylenebis-(cyclohexyl isocyanate, 4,4′-methylenebis-(phenyl isocyanate) and poly(tetramethylene oxide) or poly(ethylene oxide) were prepared including poly[( N-acylimino) ethylene] sequences as a chain extender. They were comparatively characterized by spectral, thermal and mechanical techniques. Some preliminary investigations on their nanocomposites with montmorillonite as an inorganic component are presented.

Use of a chain extender as a dispersing agent of the CaCO3 into PBAT matrix

2019 ◽  
Vol 54 (10) ◽  
pp. 1373-1382 ◽  
Author(s):  
Edilene de CD Nunes ◽  
Alana G de Souza ◽  
Derval dos S Rosa
Keyword(s):  
Chain Extender ◽  
Polymer Chains ◽  
Morphological Properties ◽  
Differential Scanning Calorimetric ◽  
Calorimetric Analysis ◽  
Elongation At Break ◽  
H Nmr ◽  
Dispersing Agent ◽  
A Chain ◽  
C Nmr

This paper investigates the effect of the incorporation of chain extender on the poly(butylene adipate -co-terephthalate) (PBAT) and their mixture with calcium carbonate (CaCO3) composites. Chain extender (ADR) was used to enhance the compatibility between PBAT and CaCO3, which have poor interfacial adhesion. Mechanical, thermal, and morphological properties of PBAT, PBAT/chain extender, and their composites were studied. The incorporation of the chain extender enhanced Young’s modulus and elongation at break of the neat PBAT, which is an indicator of the interaction between both materials. These results were confirmed by 1H NMR and 13C NMR (proton – hydrogen and carbon nuclear magnetic resonance, respectively). The chain extender acted by dispersing the CaCO3 particles; however, with an increase in the filler content, there is a decrease in the mechanical properties. Thermogravimetric analysis showed that chain extender has no influence on neat PBAT thermal behavior and their composites containing CaCO3. Differential scanning calorimetric analysis showed a decrease in crystallinity values of the PBAT and its composites, which is due to the physical impediment in the organization of polymer chains. Photomicrographs, obtained by scanning electron microscopy, showed that chain extender does not influence PBAT morphology. However, in the composites, chain extender enhanced the dispersion on CaCO3 particles.

A novel of PEG-conjugated phthalocyanine and evaluation of its photocytotoxicity and antibacterial properties for photodynamic therapy

2018 ◽  
Vol 22 (01n03) ◽  
pp. 10-24 ◽  
Author(s):  
Canan Uslan ◽  
Naciye Durmuş İşleyen ◽  
Yetkin Öztürk ◽  
Burcu Turanlı Yıldız ◽  
Z. Petek Çakar ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Hela Cells ◽  
Antibacterial Properties ◽  
Analysis Data ◽  
Inhibitory Effect ◽  
Elemental Analysis Data ◽  
The Novel ◽  
Spectrophotometric Methods ◽  
H Nmr ◽  
Poly Ethylene

A poly(ethylene glycol) (PEG)-conjugated silicon(IV) phthalocyanine axially substituted with (PEG1000) chains (SiPc-PEG) was synthesized, and this novel phthalocyanine was characterized by [Formula: see text]H-NMR, FT-IR and UV-Vis spectrophotometric methods. Elemental analysis data were beneficial for the evaluation of the chemical structure of the new compound. The total number of (O–CH[Formula: see text]–CH[Formula: see text] units was calculated as 44 and the structure of the new PEG-conjugated silicon phthalocyanine was determined by the use of integral areas in [Formula: see text]H-NMR spectrum and the ratio of SiPc:PEG1000 was found as 1:2. The photophysical and photochemical properties were determined in both DMSO and aqueous solutions. In addition, the photocytotoxicity of the novel PEG-conjugated silicon(IV) phthalocyanine was also examined by testing against human cervical-carcinoma (HeLa) and hepato-carcinoma cells (HuH-7). The IC[Formula: see text] value for the SiPc-PEG compound was determined as 0.28 [Formula: see text]M for HeLa cells and 0.4 [Formula: see text]M for HuH-7 cells. These results imply that HeLa cells are apparently more responsive to photodynamic therapy (PDT) treatment by SiPc-PEG than HuH-7 cells at low concentrations (up to 0.5 [Formula: see text]M) of the studied photosensitizer. Additionally, SiPc-PEG showed antibacterial activity against Escherichia coli at 48 h of incubation, the viabilities of E.coli cultures exposed to 1000 [Formula: see text]g/mL and 2500 [Formula: see text]g/mL SiPc-PEG concentration were reduced by about 90%, and the additional growth inhibitory effect of photoactivation was also observed clearly at these efficient concentrations. To conclude, the novel compound may have a high potential for photodynamic therapy.

scholarly journals Viscosity improvement of recycled poly (ethylene terephthalate) from waste bottles by adding antioxidants and chain-extender

2021 ◽  
Vol 302 ◽  
pp. 02019
Author(s):  
Isarankura Na Ayutthaya Siriorn ◽  
Bunyarak Munchumart ◽  
Boondeacha Natanicha ◽  
Sangrawee Nut ◽  
Markmee Nopparat ◽  
...  
Keyword(s):  
Shear Viscosity ◽  
Ethylene Terephthalate ◽  
Research Work ◽  
Chain Extender ◽  
Screw Extruder ◽  
Reactive Polymer ◽  
Poly Ethylene Terephthalate ◽  
Twin Screw ◽  
Poly Ethylene ◽  
A Chain

This research work is focused on the viscosity improvement of recycled poly(ethylene terephthalate) (rPET) from waste bottles by adding antioxidants and multi-functional reactive polymer (Joncry ADR 4468, chain extender). The achieve the objective of this work the investigated was broken into two parts. The first part studied the effect of rPET viscosity after adding various types of antioxidants and stabilizer such as Irgafos®168, Tinuvin® 770, Irganox®1010. The second part observed the effect of viscosity after it was blended with chain extender at 0, 0.2, 0.4, 0.6 and 0.8 pph. rPET was then dried in the oven at 120 oC for 12 hrs, to deplete the moisture. Then, the dried rPET (mixed with the chemicals above) was extruded into a compound using a twin screw extruder. The shear viscosity of the extruded compound was then measured using a rotational rheometer at 270 oC. The results revealed that the addition of chain extender increased the shear viscosity and the tensile strength at break of rPET. Therefore, the chain extender interacted with chains, which could change the structure to be the longer chains, branching or network structures. These structures are entangled and interrupt the movement of the molecular chains. It can be concluded that the viscosity of rPET can be improved by adding a chain extender at 0.6 pph, and the antioxidants of Irgafos®168, Tinuvin®770 and Irganox®1010 at 0.2, 0.1 and 0.5 pph, respectively.

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