Structural analysis of poly(butylene adipate) banded spherulites from their biodegradation behavior

Zhao, Lifen; Wang, Xiaohong; Li, Lin; Gan, Zhihua

doi:10.1016/j.polymer.2007.07.055

Cited by 61 publications

(60 citation statements)

References 30 publications

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“…As homopolymer, PBA (

{\bar{M}}_{w}

= 40 000 g mol –1 ) is known to crystallize in at least two crystal systems, which are either monoclinic (α crystal form) or orthorhombic (β crystal form) . In the kinetic process of fast cooling and during annealing at relatively low temperatures, PBA homopolymer preferentially develops a meta‐stable β morphology. In contrast, at higher annealing temperatures or strong deformations, PBA more likely crystallizes in the thermodynamically stable α form.…”

Section: Resultsmentioning

confidence: 99%

Poly(ester urethane) with Varying Polyester Chain Length: Polymorphism and Shape‐Memory Behavior

Bothe

Emmerling

Pretsch

2013

Macro Chemistry & Physics

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The swelling, viscoelastic, and mechanical behavior of phase‐segregated poly(ester urethane) (PEU) block copolymers, composed of 4,4′‐methylenediphenyl diisocyanate, 1,4‐butanediol as a chain extender, and crystallizable poly(1,4‐butylene adipate) (PBA) with molecular weights between 1330 and 4120 g mol−1, are investigated. Wide‐angle X‐ray scattering (WAXS) is employed to study the overall PEU crystallinity, which increases from 8.6 to 13.6% at higher PBA contents. The existence of two crystalline, polymorphic PBA phases, a thermodynamically stable α phase and a metastable β phase, is confirmed by further WAXS measurements. Calorimetric and thermomechanical investigations give evidence for controllable PBA polymorphic behavior. The crystallization conditions, like the cooling rate, affect the emerging polymorphic mixture, whereas the storage conditions either promote or inhibit the polymorphic (β to α) transition. The introduced concepts represent a new approach for gaining control over programmable thermoresponsiveness, which may be transferable to other shape‐memory polymers with polymorphic switching segments.

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“…As homopolymer, PBA (

{\bar{M}}_{w}

Section: Resultsmentioning

confidence: 99%

Poly(ester urethane) with Varying Polyester Chain Length: Polymorphism and Shape‐Memory Behavior

Bothe

Emmerling

Pretsch

2013

Macro Chemistry & Physics

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“…Another one is rhythmic crystal growth proposed by Keith et al [8,12,13] , in which a depletion zone appears at the crystal growth front. Gan et al [18] proposed that the banded spherulites were formed by two kinds of crystals with different structures. In addition, Owen [19] proposed a mechanism for twist-banding that is due to elastic bending of radially oriented lamellar ribbons where the folding directions on opposite faces of the lamellae are approximately orthogonal and inclined to the radial direction, leading to the formation of helicoidally twisted lamellae.…”

Section: Introductionmentioning

confidence: 99%

Structures and growth mechanisms of poly-(3-hydroxybutyrate) (PHB) crystallized from solution and thin melt film

Cao

Qiao

Wang

et al. 2008

Sci. China Ser. B-Chem.

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The spherulitic structures and morphologies of poly-(3-hydroxybutyrate) (PHB) crystallized from a solution and a thin melt film were investigated in this study. The formation mechanisms of banded spherulites under different crystallization conditions are proposed. It was found that the formation of banded spherulites was caused by the rhythmic crystal growth of the spherulites and lamellar twisting growth for the polymer crystallization from a thin melt film and a solution, respectively. rhythmic crystal growth, lamellar twisting, banded spherulite, poly(3-hydroxybutyrate)

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“…29 A neat PBA sample (Mw ¼ 68 000 Da) formed banded spherulites at temperatures from 29 to 31 1C when in the mixed crystal form. 30 In contrast to neat PBA, the PLLA/PBA blend formed banded spherulites at 34 1C (mixed crystals) and 32 1C (only b crystals). Such a change may be caused by the presence of solid PLLA, which changes the PBA crystal growth environment.…”

Section: Resultsmentioning

confidence: 95%

Isothermal crystallization of poly(L-lactide) and poly(butylene adipate) crystalline/crystalline blends

Zhao

Kong

Tian

et al. 2014

Polym J

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The isothermal crystallization kinetics, morphology and melting behavior of poly(L-lactide) and poly(butylene adipate) (PLLA/ PBA) crystalline/crystalline blends were studied in the high-and low-temperature regions using differential scanning calorimetry (DSC) and polarized optical microscopy (POM). In the high-temperature region, the PLLA crystallized faster, and the blends had lower equilibrium melting temperatures than neat PLLA due to the high-mobility PBA chain. In the low-temperature region, the PBA crystallization rate was lower in the blends. Additionally, the polymorphic structures and crystallization morphologies of PBA were influenced by PLLA greatly. The PBA in the blends formed a and b crystal structures, whereas neat PBA only formed a crystal structures. POM indicated that the neat PBA formed Maltese-cross spherulites across the studied temperature range. However, banded spherulites formed in the blend at 32 and 34 1C.

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Structural analysis of poly(butylene adipate) banded spherulites from their biodegradation behavior

Cited by 61 publications

References 30 publications

Poly(ester urethane) with Varying Polyester Chain Length: Polymorphism and Shape‐Memory Behavior

Poly(ester urethane) with Varying Polyester Chain Length: Polymorphism and Shape‐Memory Behavior

Structures and growth mechanisms of poly-(3-hydroxybutyrate) (PHB) crystallized from solution and thin melt film

Isothermal crystallization of poly(L-lactide) and poly(butylene adipate) crystalline/crystalline blends

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