Review: Crystallization of Biodegradable Polymers

Dhanvijay, Prarthana U.; Shertukde, Vikrant V.

doi:10.1080/03602559.2010.543744

Cited by 26 publications

(23 citation statements)

References 80 publications

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“…This result led Strocks to suggest the chain-folded structure for explaining the crystallization. This proposal was conducted by Schlesinger and Leeper in a similar study (15).…”

Section: Introductionmentioning

confidence: 93%

“…A fringe is the molecule chains between amorphous and crystalline phases. The problem with the fringe model is that it could not explain quiescent crystallization phenomena correctly (15,16).…”

Section: Introductionmentioning

confidence: 99%

“…The random-reentry folded model was proposed by Flory and the idea of the model is that macromolecule chains fold back into the same lamella randomly or even participate into adjoining lamellae. The upper and under surfaces of the lamellae are composed of loops due to the reentry of chains and transitional region between crystalline lamellae and the amorphous phase (15).…”

Section: Introductionmentioning

confidence: 99%

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An experimental study and model development of poly(ethylene terephthalate) yarn morphology

Yıldırım

Ulcay

2014

E-Polymers

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In this study, macromolecular arrangements in fibers were investigated and a novel approach based on model development for partially oriented (POY) polyethylene terephthalate (PET) yarn morphology was proposed. Differential scanning calorimeter (DSC) analysis, Fourier transform infrared (FT-IR) analysis, boiling water shrinkage and tensile tests were performed through the study. DSC thermogram, FT-IR spectra, stress-strain curve, the change in the boiling water shrinkage properties and data from the literature were used to develop the model for POY PET fiber morphology. In order to make a comparison, textured PET yarn morphology was also investigated. The neck formations during tensile tests, cold crystallization on the DSC thermogram, peak formation on the FT-IR spectrum of the POY PET yarn after texturizing and shrinkage test at 971 and 845 cm -1 and shrinkage phenomenon have been explained by this model.

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“…This result led Strocks to suggest the chain-folded structure for explaining the crystallization. This proposal was conducted by Schlesinger and Leeper in a similar study (15).…”

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An experimental study and model development of poly(ethylene terephthalate) yarn morphology

Yıldırım

Ulcay

2014

E-Polymers

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“…The nucleation type changes between the thermal and athermal nucleation processes, and these are followed by three-dimensional spherulite growth. 41,42 The n values of the composite films, expressed by surface characteristics and Pareto plots are shown in Figure 10(a,b). The surface graphs have saddle shapes.…”

Section: Effect Of the Additives On The Melting Behaviormentioning

confidence: 99%

“…The various n values are associated with different nucleation types and crystal geometries. 42,43 The n values change between 1.86 and 2.77. These show that the crystallization is controlled by nucleation, and the crystals have a spherical structure.…”

Section: Effect Of the Additives On The Melting Behaviormentioning

confidence: 99%

Isothermal crystallization kinetics and mechanical properties of polycaprolactone composites with zinc oxide, oleic acid, and glycerol monooleate

Alp

Cesur

2013

J of Applied Polymer Sci

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The isothermal crystallization and mechanical behavior of polycaprolactone (PCL) with zinc oxide (ZnO) with oleic acid and glycerol monooleate (GMO) were studied. Theoretical melting points calculated by the Flory-Huggins and Thompson-Gibbs models were thoroughly compared with differential scanning calorimetry experimental observations. The isothermal crystallization kinetic parameters by Avrami analysis showed that crystallization was controlled by nucleation, crystal growth was spherical, and the nucleation type changed between thermal and athermal nucleation. X-ray diffraction showed that when the additives were used together both the crystal thickness and the degree of crystallinity increased. A multiple-response regression analysis was made with the ZnO, oleic acid, and GMO concentrations as variables and the crystallinity as output. Interaction parameters by the Pukanzky model were calculated from the tensile strength at the yield point and indicated that the addition of oleic acid or GMO improved the interface between the ZnO particles and PCL.

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Plasticized poly(lactic acid) with low molecular weight poly(ethylene glycol): Mechanical, thermal, and morphology properties

Chieng

Ibrahim

Yunus

et al. 2013

J of Applied Polymer Sci

125

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Poly(lactic acid) PLA was plasticized with low molecular weight poly(ethylene glycol) PEG‐200 to improve the ductility of PLA, while maintaining the plasticizer content at maximum 10 wt%. Low molecular weight of PEG enables increased miscibility with PLA and more efficient reduction of glass transition temperature (Tg). This effect is enhanced not only by the low molecular weight but also by its higher content. The tensile properties demonstrated that the addition of PEG‐200 to PLA led to an increase of elongation at break (>7000%), but a decrease of both tensile strength and tensile modulus. The plasticization of the PLA with PEG‐200 effectively lowers Tg as well as cold‐crystallization temperature, increasing with plasticizer content. SEM micrographs reveal plastic deformation and few long threads of a deformed material are discernible on the fracture surface. The use of low molecular weight PEG‐200 reduces the intermolecular force and increases the mobility of the polymeric chains, thereby improving the flexibility and plastic deformation of PLA. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4576–4580, 2013

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Review: Crystallization of Biodegradable Polymers

Cited by 26 publications

References 80 publications

An experimental study and model development of poly(ethylene terephthalate) yarn morphology

An experimental study and model development of poly(ethylene terephthalate) yarn morphology

Isothermal crystallization kinetics and mechanical properties of polycaprolactone composites with zinc oxide, oleic acid, and glycerol monooleate

Plasticized poly(lactic acid) with low molecular weight poly(ethylene glycol): Mechanical, thermal, and morphology properties

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