Rapid crystallization of poly(l-lactic acid) induced by a nanoscaled zinc citrate complex as nucleating agent

Song, Ping; Chen, Guangyi; Wei, Zhiyong; Chang, Ying; Zhang, Wanxi; Liang, Jicai

doi:10.1016/j.polymer.2012.07.032

Cited by 93 publications

(51 citation statements)

References 83 publications

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“…However, during the actual process of crystal growth, the practical circumstances cannot satisfy the ideal state resulting in a deviation of the n value from 3, probably due to the existence of athermal crystallization during the crystallization process [5]. The obtained n values of PLLA/INT-WS 2 were similar to those reported for PLLA/GO [22], PLLA/ZnCC [21], PLLA/POSS [16] PLLA/ovi-POSS [17] (Fig. 5b), suggesting a three-dimensional crystallization growth and simultaneous homogeneous nucleation mechanism.…”

Section: Isothermal Crystallizationsupporting

confidence: 78%

“…Effective nucleating agents reported for PLLA are zinc phenylphosphonate (PPZn) [9] and p-tert-butylcalix [8] arene [10], talc [11], uracil [12] and N,N 0 -bis(benzoyl) suberic acid dihydrazide [13], whilst cellulose nanocrystals (CNC) [14], titanium dioxide (TiO 2 ) nanowires [15], polyhedral oligomeric silsesquioxanes (POSS) [16,17], nanclay (MMT) [18], carbon nanotubes (CNTs) [19], nanocalcium carbonate (CaCO 3 ) [20], nano-zinc citrate (ZnCC) [21], graphene oxide (GO) [22] and fullerenes (C60) [23], are known as nanocomposite-forming additives. However, the fabrication of high quality nanocomposites normally requires chemical treatment to reduce the surface energy in order to ensure good particle dispersion and strong interaction and adhesion between the nanofiller and polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

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Isothermal crystallization kinetics and melting behavior of poly(l-lactic acid)/WS2 inorganic nanotube nanocomposites

Naffakh

Marco

2015

J Mater Sci

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Environmentally friendly and biocompatible tungsten disulphide inorganic nanotubes (INT-WS 2 ) were introduced into a poly(L-lactic acid) biopolymer matrix to generate novel nanocomposite materials through an advantageous melt-processing route. The effects of INT-WS 2 on isothermal crystallization and melting behaviour of PLLA have been investigated. INT-WS 2 has excellent acceleration effectiveness on the melt-crystallization of PLLA better than the promising nano-sized fillers reported in the literature (e.g. carbon nanotubes, graphene oxide, cellulose nanocrystals). In particular, the addition of INT-WS 2 remarkably influences the energetics and kinetics of nucleation and growth of PLLA, reducing the fold surface free energy by up to 18 %. In the same way, the final crystallinity and subsequent melting behaviour of PLLA were controlled by both the incorporation INT-WS 2 and variation of the crystallization temperature. These observations will enable the development of novel melt-processable PLLA/INT-WS 2 nanocomposites with improved crystallization behaviour for many eco-friendly and biomedical applications.

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Section: Isothermal Crystallizationsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Isothermal crystallization kinetics and melting behavior of poly(l-lactic acid)/WS2 inorganic nanotube nanocomposites

Naffakh

Marco

2015

J Mater Sci

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“…It is necessary to discuss on the nucleation mechanism of the GNS in s‐PDLA‐PLLA matrix. From the basic principles of heterogeneous nucleation, both chemical nucleation and epitaxial nucleation are used to clarify the nature of nucleation phenomena of nucleating agent containing polymers . With regard to the chemical nucleation, the nucleating agent dissolves in the polymer melts and reacts with its, generating ionic chain ends that precipitate into the melt and form organized aggregates which are the true nucleating species.…”

Section: Resultsmentioning

confidence: 99%

Influence of graphene nanosheets on stereocomplex crystallization behaviors of star‐shaped poly (D(L)‐lactide) stereoblock copolymer

Chen

Fan

2017

Polymers for Advanced Techs

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The nanocompsites of star-shaped poly(D-lactide)-co-poly(L-lactide) stereoblock copolymers (s-PDLA-PLLA) with two-dimensional graphene nanosheets (GNSs) were prepared by solution mixing method. Crystallization behaviors were investigated using differential scanning calorimetry, polarized optical microscopy, and wide angle X-ray diffraction. The results of isothermal crystallization behaviors of the nanocompsites clearly indicated that the GNS could remarkably accelerate the overall crystallization rate of s-PDLA-PLLA copolymer. Unique stereocomplex crystallites with melting temperature about 207.0°C formed in isothermal crystallization for all samples. The crystallization temperatures of s-PDLA-PLLAs shifted to higher temperatures, and the crystallization peak shapes became sharper with increasing GNS contents. The maximum crystallization temperature of the sample with 3 wt% GNS was about 128.2°C, ie, 15°C higher than pure s-PDLA-PLLA. At isothermal crystallization processes, the halftime of crystallization (t 0.5 ) of the sample with 3 wt% GNS decreased to 6.4 minutes from 12.9 minutes of pure s-PDLA-PLLA at 160°C.The Avrami exponent n values for the nanocomposites samples were 2.6 to 3.0 indicating the crystallization mechanism with three-dimensional heterogeneous nucleation and spherulites growth. The morphology and average diameter of spherulites of s-PDLA-PLLA with various GNS contents were observed in isothermal crystallization processes by polarized optical microscopy. Spherulite growth rates of samples were evaluated by using combined isothermal and nonisothermal procedures and analyzed by the secondary nucleation theory.The results evidenced that the GNS has acceleration effects on the crystallization of s-PDLA-PLLA with good nucleation ability in the s-PDLA-PLLA material.

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“…1c), no obvious crystallization peak was observed for the pure PLLA, which showed that the crystallization rate of the pure PLLA was The epitaxial nucleation mechanism based on the dimensional lattice matching rules [26,27] was used to explain the nucleation mechanism of carboxylates in polypropylene [28][29][30][31][32][33][34] . It was also adopted to explain the superior nucleation ability of some carboxylates in a PLLA matrix, such as zinc phenylphosphonate [23] , zinc citrate complex nanoparticles [35] and cadmium phenylmalonate [36] . A good matching relationship between the cell parameters of the carboxylate and PLLA is required for it to be an efficient nucleating agent.…”

Section: Dsc Measurementsmentioning

confidence: 99%

Effect of Metallic Salts of Phenylmalonic Acid on the Crystallization of Poly(L-lactide)

Dou

2015

Journal of Macromolecular Science, Part B

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The effect of the metallic salts of phenylmalonic acid (PMA), as novel nucleating agents, on the melt and crystallization behaviors, spherulitic morphologies and crystal structures of poly(L-lactide) (PLLA) were studied by means of differential scanning calorimetry (DSC), polarized light microscopy (PLM) and wide angle X-ray diffraction (WAXD). The results showed that calcium and cadmium salts of PMA are good nucleating agents for PLLA. Lithium, sodium, magnesium, strontium and zinc salts of PMA are moderate nucleating agents, barium and aluminum salts of PMA are weak nucleating agents, while potassium phenylmalonate is not a nucleating agent for PLLA. The presence of nucleating agents significantly increased the number and decreased the size of the spherulites, but the crystal structures of the nucleated PLLA samples were not changed.

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Rapid crystallization of poly(l-lactic acid) induced by a nanoscaled zinc citrate complex as nucleating agent

Cited by 93 publications

References 83 publications

Isothermal crystallization kinetics and melting behavior of poly(l-lactic acid)/WS2 inorganic nanotube nanocomposites

Isothermal crystallization kinetics and melting behavior of poly(l-lactic acid)/WS2 inorganic nanotube nanocomposites

Influence of graphene nanosheets on stereocomplex crystallization behaviors of star‐shaped poly (D(L)‐lactide) stereoblock copolymer

Effect of Metallic Salts of Phenylmalonic Acid on the Crystallization of Poly(L-lactide)

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