Miscibility in crystalline/amorphous blends of poly(3‐hydroxybutyrate)/DGEBA

Silva, Leonel Ignacio; Tognana, S.; Salgueiro, W.

doi:10.1002/polb.23242

Cited by 12 publications

(19 citation statements)

References 30 publications

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“…For blends A and B, a shifting of the glass transition temperatures to lower values is registered as the content of TDP or MDP increases. An evident plasticizing effect, described in several polymer blends previously studied [32,[50][51][52][53], is observed, that is, the reduction of the Tg corresponding to the polymer component: the material becomes more flexible, improving the malleability for further use [6]. The LMWC acting as plasticizing increases the free volume between the polymer chains and so less energy is required to produce motion on chain segments.…”

Section: Resultsmentioning

confidence: 99%

“…In the field of the polymer-LMWC blends, many works are focused on possible applications and not so much on the molecular characterization of interactions. LMWCs are added as additives to improve the properties of the polymeric component [6,[30][31][32][33][34][35][36][37]. Consequently, polymer-LMWC blends with different practical applications have been reported: controlled drug devices [38][39][40][41][42], regenerative medicine [43], electronic devices [44], hemodialysis applications [45], etc.…”

Section: Introductionmentioning

confidence: 99%

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Blends of Poly(vinyl Pyridine)s and Dihydric Phenols: Thermal and Infrared Spectroscopic Studies. Part V

Gatica¹,

Medina²,

Moraga³

et al. 2019

J. Chil. Chem. Soc.

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Binary blends with poly(4-vinyl pyridine) (P4VPy) 160,000 g/mol and poly(2-vinyl pyridine) (P2VPy) 159,000 g/mol as polymer components and 4,4´-thiodiphenol (TDP), 4,4´-methylendiphenol (MDP), 2,2´-biphenol (22BP) and 4,4´-biphenol (44BP) as low molecular weight compounds (LMWCs), were prepared. Miscibility between the components was analyzed by Fourier Transform Infrared Spectroscopy (FTIR) and Differential Scanning Calorimetry (DSC). Thermogravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM) were also used as complementary techniques. Hydrogen bonding formation was detected by FTIR due to the increasing of the wave number corresponding to the deformation absorption of pyridine groups in P4VPy and P2VPy. A decreasing of melting points and fusion heats of the LMWCs is observed by DSC, which shows a lower crystallinity level as the blends are richer in the polymer component as a consequence of the intermolecular interaction. A plasticizing effect is also observed by DSC when P4VPy is blended with TDP and MDP; the higher steric hindrance prevents this effect when P2VPy is blended with 22BP and 44BP. Miscible blends were obtained with a moderate trend to a higher interaction degree in blends containing P4VPy. This report is the fifth part of a series of works including polymer-LMWC blends. Variables such as molecular weight increase in P4VPy and steric hindrance in P2VPy have been comparatively analyzed with blends previously reported.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Blends of Poly(vinyl Pyridine)s and Dihydric Phenols: Thermal and Infrared Spectroscopic Studies. Part V

Gatica¹,

Medina²,

Moraga³

et al. 2019

J. Chil. Chem. Soc.

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“…In a perfect lamellar structure it is assumed that L is equal to the sum of to the thickness of the amorphous ( l a ) or crystalline ( l c ) regimens but there is an inherent problem with the interpretation of the information obtained from SAXS originated from the principle of Babinet and in some cases, leads to an ambiguity in the allocation of the two main distances of a semi‐crystalline structure. Then considering that parameters l 1 and l 2 can represent l a or l c (depending on the sample) and that l c / L is the linear degree of crystallinity within the lamellar stacks, Φ l , the assignment of these parameters has to be done with the help of the bulk degree of crystallinity of the blends, Φ c , calculated from DSC measurements .…”

Section: Resultsmentioning

confidence: 99%

Phase separation and segregation morphology of PCL/PS blends: Quantitative effect of the crystallization temperature, composition, and molecular weight of PS

Silva

Rojo

Riccardi

2016

Polymer Engineering & Sci

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The phase diagrams for blends of semicrystalline poly(ecaprolactone) (PCL) with amorphous polystyrene (PS) were determined and it was noticed that when molecular weight increases, the critical composition diminishes while its temperature increases. That is the same effect that produces the increase in the polydispersity of PS. From the fitting of phase diagrams of blends of PCL with oligomers and homopolymers of PS, taking into account the polydispersity, it was possible to conclude that the miscibility in these systems is due only by entropic effects. The crystalline fraction as well as the interlamellar spacing increased with crystallization temperature while the volume fraction of the amorphous PCL in the interfibrillar regions increases for the pure PCL and in its blends with low concentration of PS. Increasing the mass fraction of PS increases the average long spacing (L) till a weight fraction of 60%, for higher mass fractions L is almost constant indicating the interfibrillar segregation of PS. The PCL lamellar morphology is not affected when the molecular weight of PS employed is similar or higher than the molecular weight of PCL. If the PS has a higher molecular weight its penetration into the structure is inhibited.

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“…A homogeneous solution was observed at high temperature. A DSC study has demonstrated that this blend is miscible in the molten state …”

Section: Methodsmentioning

confidence: 99%

“…The authors have recently reported a study on miscibility and lamellar crystallinity in blends PHB/DGEBA . Following this line of research, the goal of this work was to obtain information about the crystallization and melting process in melt‐crystallized PHB/DGEBA blends through real‐time SAXS experiments and differential scanning calorimetry (DSC), studying, in particular, morphological changes in the lamellar structure and the melting and re‐crystallization process.…”

Section: Introductionmentioning

confidence: 99%

Crystallization in PHB/DGEBA blends

Tognana

Silva

Salgueiro

2014

J Polym Sci B Polym Phys

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Real-time experiments using small-angle X-ray scattering and differential scanning calorimetry on blends of the semicrystalline polyester poly(3-hydroxybutyrate) (PHB) and amorphous monomer epoxy DGEBA (diglycidyl ether of bisphenol A) were performed. Differences in the processes of melting and recrystallization were observed in blends relative to pure PHB. The results obtained in this study indicated that re-crystallization is more important in blends with 50% DGEBA than in pure PHB. Moreover, segregation toward the interfibrillar region would facilitate re-crystallization.

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Miscibility in crystalline/amorphous blends of poly(3‐hydroxybutyrate)/DGEBA

Cited by 12 publications

References 30 publications

Blends of Poly(vinyl Pyridine)s and Dihydric Phenols: Thermal and Infrared Spectroscopic Studies. Part V

Blends of Poly(vinyl Pyridine)s and Dihydric Phenols: Thermal and Infrared Spectroscopic Studies. Part V

Phase separation and segregation morphology of PCL/PS blends: Quantitative effect of the crystallization temperature, composition, and molecular weight of PS

Crystallization in PHB/DGEBA blends

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