scholarly journals Co-Polymers based on Poly(1,4-butylene 2,5-furandicarboxylate) and Poly(propylene oxide) with Tuneable Thermal Properties: Synthesis and Characterization

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 328 ◽  
Author(s):  
Marina Matos ◽  
Andreia Sousa ◽  
Patrícia Mendonça ◽  
Armando Silvestre
Keyword(s):  
Propylene Oxide ◽  
Enzymatic Degradation ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
1H And 13C Nmr ◽  
Crystalline Nature ◽  
Furandicarboxylic Acid ◽  
Poly Propylene ◽  
Ether Ester ◽  
Degradation Evaluation

Poly(ether ester)s (PEEs) represent a promising class of segmented co-polymers, nevertheless the synthesis of PEEs based on renewable 2,5-furandicarboxylic acid (FDCA) is still scarce. In this context, a series of poly(1,4-butylene 2,5-furandicarboxylate)-co-poly(poly(propylene oxide) 2,5-furandicarboxylate) co-polyesters with different composition of stiff poly(1,4-butylene 2,5-furandicarboxylate) (PBF) and soft poly(poly(propylene oxide) 2,5-furandicarboxylate) (PPOF) moieties were synthesized, via a two-step bulk polytransesterification reaction. The molar ratio of PBF/PPOF incorporated was varied (10 to 50 mol%) in order to prepare several novel materials with tuned properties. The materials were characterised in detail through several techniques, namely ATR FTIR, 1H and 13C NMR, TGA, DSC, DMTA and XRD. Their hydrolytic and enzymatic degradation evaluation was also assessed. These new co-polymers showed either a semi-crystalline nature when higher PBF/PPOF ratios were used, and for approximately equal amounts of PBF and PPOF an amorphous co-polyester was obtained instead.

Synthesis and characterization of degradable triarm low unsaturated poly(propylene oxide)-block-polylactide copolymers

2010 ◽  
pp. n/a-n/a
Author(s):  
Dongmei Yang ◽  
Qi Lu ◽  
Zhongyong Fan ◽  
Suming Li ◽  
Jianjun Tu ◽  
...  
Keyword(s):  
Propylene Oxide ◽  
Synthesis And Characterization ◽  
Poly Propylene

scholarly journals The influence of antioxidant and post-synthetic treatment on the properties of biodegradable poly(butylene succinate)s modified with poly(propylene oxide)

2007 ◽  
Vol 72 (12) ◽  
pp. 1515-1531 ◽  
Author(s):  
Dragana Pepic ◽  
Marija Radoicic ◽  
Marija Nikolic ◽  
Jasna Djonlagic
Keyword(s):  
Molecular Weight ◽  
Propylene Oxide ◽  
Enzymatic Degradation ◽  
Surface Erosion ◽  
Candida Cylindracea ◽  
Butylene Succinate ◽  
Candida Cylindracea Lipase ◽  
Degradation Tests ◽  
Poly Propylene ◽  
The Impact

Novel poly(ester-ether)s based on poly(butylene succinate) (PBS) as the hard segments and 30 mass % of poly(propylene oxide) (PPO) as the soft segments were synthesized with varying amount of the antioxidant (N,N'-diphenyl-p-phenylenediamine, DPPD). The influences of the addition of DPPD and the impact of post-synthetic treatment by precipitation on the molecular structure, thermal and physical properties, as well as on the storage stability of the biodegradable aliphatic copolyesters, were investigated. The structure and composition of the copolymers were determined by means of 1H-NMR spectroscopy. The molecular weight and polydispersity of the poly(ester-ether)s were evaluated from solution viscosity and GPC measurements. The thermal properties and stability were evaluated, respecttively, by means of DSC and non-isothermal thermogravimetry in an inert nitrogen atmosphere. The biodegradability potential of the polymers was studied in hydrolytic and enzymatic degradation tests with Candida cylindracea lipase by monitoring the weight loss of polymer films after incubation. The weight losses of the samples increased with time and were in the range from 1 to 5 mass % after 4 weeks. GPC analysis confirmed that there were changes in the molecular weight of the copolyesters during both hydrolytic and enzymatic degradation tests, leading to the conclusion that the degradation mechanism of poly(butylene succinate)s modified with PPO occurred through surface erosion and bulk degradation.

Morphology and phase behaviour of poly(propylene oxide) containing copoly(ether ester)s

e-Polymers ◽  
2004 ◽  
Vol 4 (1) ◽  
Author(s):  
Ronald F. M. Lange ◽  
Wouter Gabrielse
Keyword(s):  
Ethylene Oxide ◽  
Amorphous Phase ◽  
Propylene Oxide ◽  
Analytical Techniques ◽  
Phase Behaviour ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Poly Propylene ◽  
Cp Mas Nmr ◽  
Ether Ester

Abstract The morphology and phase behaviour of six different copoly(ether ester) elastomers, based on poly(butylene terephthalate) (PBT) hard blocks and poly- (ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (PEO-b- PPO-b-PEO) soft blocks, differing in soft-block content and molecular weight of the soft block, have been investigated using various analytical techniques such as DSC, dynamic mechanical thermal analysis, dielectric spectroscopy, 13C CP-MAS NMR, AFM, TEM, and optical microscopy. The PBT blocks were found to crystallize in lamellar structures that form a continuous highly interconnected architecture. No crystalline regions for the PEO-b-PPO-b-PEO triblock could be observed, whereas no indications of a separate pure amorphous PBT phase were found. It is further shown that the amorphous phase is not a homogeneous mixture of amorphous PBT and soft segments. Based on the combined results of the analytical techniques used it is concluded that the PPO segments form an almost pure amorphous phase, whereas the PEO segments form a mixed phase with amorphous PBT. It is believed that the presence of this pure amorphous PPO phase provides the PEO-b-PPO-b-PEO containing copoly(ether ester)s with their excellent coldtemperature properties.

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