Favorable formation of stereocomplex crystals in poly( l -lactide)/poly( d -lactide) blends by selective nucleation

Zhang, Xiong; Zhang, Xiuqin; Wang, Rui; Vos, Sicco de; Wang, Ruyin; Joziasse, Cornelis A.P.; Wang, Dujin

doi:10.1016/j.polymer.2015.08.056

Cited by 95 publications

(68 citation statements)

References 45 publications

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“…That is, f EBH as the NA is significantly lower than the amount of EBH incorporated into the PBA matrix. As mentioned above, several multi‐amide organic NAs can self‐assemble into rod‐like crystals via the hydrogen bonding interaction in the PLA matrix . In this work, no visible self‐assembled structure (such as rod‐like crystals) can be found in the polarized optical microscopy image.…”

Section: Resultsmentioning

confidence: 65%

“…An ideal NA frequently shows good miscibility with the polymer matrix in the melting state, and presents a higher melting temperature ( T m ) and T c than the polymer matrix, because the polymer/NA composite will transform from the uniform melt into the liquid–solid state before the crystallization of the polymer matrix, which provides heterogeneous nuclei for the subsequent crystal growth of the polymer matrix . It was reported that several low‐molecular‐weight multi‐amide organic derivatives can be partially or completely dissolved in a polylactide (PLA) melt, and further recrystallize and assemble in the subsequent cooling process, leading to the needle, cone and shish‐kebab crystal structures of PLA/NA composites depending on the weight fraction of the NA . These multi‐amide organic derivatives greatly enhance the crystallization rate and T c , and shorten the crystallization time of PLA.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Polymorphism and properties of biodegradable poly(1,4‐butylene adipate) tailored using an aliphatic diamide derivative

Kong

Jia

Yang

et al. 2018

Polymer International

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N,N′‐Ethylenebis(12‐hydroxystearamide) (EBH), an aliphatic diamide organic compound with environmental friendliness, was selected as an effective nucleating agent to be incorporated into poly(1,4‐butylene adipate) (PBA) polyester. EBH increased the crystallization temperature, crystallinity, crystal density and thermal stability, and shortened the crystallization time of PBA. EBH slowed down the critical temperature of the PBA α‐crystal, accelerated the β‐to‐α phase transition rate and tailored the polymorphic crystalline structure of the PBA probably via the interfacial interaction and/or crystal lattice matching between PBA and EBH. In the presence of EBH, the degradation rate of PBA decreased. The mechanisms of the nucleation, manipulation of the crystal type, accelerated β‐to‐α phase transition, enhanced thermal stability and decreased enzymatic degradation rate of PBA are proposed and discussed in detail. © 2018 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Polymorphism and properties of biodegradable poly(1,4‐butylene adipate) tailored using an aliphatic diamide derivative

Kong

Jia

Yang

et al. 2018

Polymer International

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“…Up to date, many methods have been reported to enhance the SC crystallization of HMW PLLA/PDLA blend; these methods include stereoblock copolymerization, control over chain structure and topology, change of crystallization conditions, polymer blending, use of stretching/shearing force, additions of nanofillers, and specific nucleator . Most of these methods require chemical modifications of polymer chains or complicated processing.…”

Section: Introductionmentioning

confidence: 99%

“…Most of these methods require chemical modifications of polymer chains or complicated processing. In contrast, use of nucleator is a simple yet efficient method to accelerate crystallization rate and promote SC formation of PLLA/PDLA blends, because this method only requires an additive and can be easily realized by melting processing.…”

Section: Introductionmentioning

confidence: 99%

Promoted stereocomplex formation and two‐step crystallization kinetics of poly( l ‐lactic acid)/poly( d ‐lactic acid) blends induced by nucleator

Xie

Han

Shan

et al. 2019

Polymer Crystallization

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Stereocomplex (SC) crystallization is an effective method to improve the physical performance of poly(lactic acid) (PLA) materials. However, SCs crystallization is usually suppressed by homocrystallization (HCs) of high‐molecular‐weight (HMW) poly(L‐lactic acid)/poly(D‐lactic acid) (PLLA/PDLA) blend; this restricts the preparation and processing of SC‐PLA materials. Here, a series of SC‐type nucleators is selected to add into PLLA/PDLA blends, that is, p‐xylene bisalkyl urea (XBU) compound. This type of nucleators not only accelerates the crystallization rate but also promotes the SC formation in HMW PLLA/PDLA blends. XBU‐containing PLLA/PDLA blend shows unique two‐step crystallization kinetics, which stems from the sequential formations of SCs and HCs during crystallization. XBU‐promoted SC crystallization of PLLA/PDLA blend is proposed to be attributable to the H‐bonding interactions between XBU and PLLA or PDLA chains. Incorporation of XBU nucleator also improves the mechanical strength and modulus of PLLA/PDLA blends at high temperature because of the enhanced SC formation.

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“…Thus, nowadays, many researchers focus on the formation mechanism of the stereocomplexation between enantiomeric PLAs, and different methods to improve the content of SCs have been proposed. For instance, the formation of SCs can be promoted by applying a shearing field, adding specific nucleating agents, or one‐dimensional fillers, such as carbon nanotubes, synthesizing polymers with new topology, and changing crystallization temperatures …”

Section: Introductionmentioning

confidence: 99%

Dynamic Monte Carlo simulations of competition in crystallization of mixed polymers grafted on a substrate

Nie

Liu

et al. 2018

J Polym Sci B Polym Phys

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Nowadays, preparation of poly(lactide) (PLA) with high content of stereocomplex crystallites (SCs) is receiving more and more attentions. The stereocomplex formation between enantiomeric poly(l‐lactide) and poly(d‐lactide) can efficiently improve the corresponding mechanical properties and thermal stability. In the current work, using dynamic Monte Carlo simulations, the microscopic mechanism of SC formation in grafted polymers was investigated. The increase in grafting density can lead to the enhancement of SC formation. On one hand, the miscibility between the chains of different types can be improved due to the grafting. On the other hand, the increase in grafting density can result in the higher degree of chain extension and the change in crystal nucleation and growth modes. The changes facilitate the stereocomplex formation. These findings not only provide an effective way to prepare PLAs with high content of SCs, but also reveal the underlying mechanisms controlling the SC formation. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 89–97

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Favorable formation of stereocomplex crystals in poly( l -lactide)/poly( d -lactide) blends by selective nucleation

Cited by 95 publications

References 45 publications

Polymorphism and properties of biodegradable poly(1,4‐butylene adipate) tailored using an aliphatic diamide derivative

Polymorphism and properties of biodegradable poly(1,4‐butylene adipate) tailored using an aliphatic diamide derivative

Promoted stereocomplex formation and two‐step crystallization kinetics of poly( l ‐lactic acid)/poly( d ‐lactic acid) blends induced by nucleator

Dynamic Monte Carlo simulations of competition in crystallization of mixed polymers grafted on a substrate

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