Insight into the role of bound water of a nucleating agent in polymer nucleation: a comparative study of anhydrous and monohydrated orotic acid on crystallization of poly(<scp>l</scp>-lactic acid)

Song, Ping; Sang, Lin; Zheng, Liuchun; Wang, Chao; Liu, Kankan; Wei, Zhiyong

doi:10.1039/c7ra02617j

Cited by 14 publications

(8 citation statements)

References 57 publications

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“…Tests with anhydrous (OA-a) and monohydrated (OA-m) orotic acid were carried out to gain an insight into the role that water molecules play in the activity of orotic acid as a nucleating agent in PLA crystallization [ 56 ]. The compounds were mixed with PLLA melt, and their nucleation effectiveness in the non-isothermal and isothermal melt crystallization of PLLA was investigated.…”

Section: Organic Nucleatorsmentioning

confidence: 99%

“…The isothermal crystallization behaviour of PLLA/OA blends was investigated with time-resolved FTIR spectroscopy [ 56 ]. The spectral evolution of conformational changes and chain packing during thermal annealing at 140 °C showed that for both PLLA admixed with OA-a and OA-m, the crystallization proceeded with changes in the interchain interactions that were followed by the formation of the 10 3 helix.…”

Section: Organic Nucleatorsmentioning

confidence: 99%

“… Avrami plots for blends of PLLA and ( a ) anhydrous or ( b ) monohydrate orotic acid isothermally melt-crystallized at 130 °C [ 56 ]. Published by The Royal Society of Chemistry (2017).…”

Section: Figures and Schemesmentioning

confidence: 99%

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Supramolecular Interactions in Hybrid Polylactide Blends—The Structures, Mechanisms and Properties

Kowalewska

Nowacka

2020

Molecules

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The conformation of polylactide (PLA) chains can be adjusted by supramolecular interactions (the formation of hydrogen bonds or host-guest complexes) with appropriate organic molecules. The structures formed due to those intermolecular interactions may act as crystal nuclei in the PLA matrix (“soft templating”). In this review, the properties of several supramolecular nucleating systems based on synthetic organic nucleators (arylamides, hydrazides, and 1,3:2,4-dibenzylidene-d-sorbitol) are compared to those achieved with biobased nucleating agents (orotic acid, humic acids, fulvic acids, nanocellulose, and cyclodextrins) that can also improve the mechanical properties of PLA. The PLA nanocomposites containing both types of nucleating agents/additives are discussed and evaluated in the context of their biomedical applicability.

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Section: Organic Nucleatorsmentioning

confidence: 99%

Section: Organic Nucleatorsmentioning

confidence: 99%

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Supramolecular Interactions in Hybrid Polylactide Blends—The Structures, Mechanisms and Properties

Kowalewska

Nowacka

2020

Molecules

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“…Through analysis of progress in nucleating agents for PLLA, it was found that the nucleating agent for PLLA gradually evolved from inorganic compounds to organic compounds [32]. For the organic nucleating agents, the inherent disadvantage of poor compatibility of inorganic nucleating agents with PLLA matrix can be effectively avoided, and organic nucleating agents also present better nucleation effect for PLLA as compared to the inorganic nucleating agents [33]. Therefore, further developing efficient organic nucleating agents to finally realize large-scale application is very important to PLLA industry.…”

Section: Introductionmentioning

confidence: 99%

Insight into the Role of a Isophthalic Dihydrazide Derivative Containing Piperonylic Acid in Poly(L-lactide) Nucleation: Thermal Performances and Mechanical Properties

Huang¹,

Zhang²,

Zhao³

et al. 2020

Mater. Plast.

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This work was aimed at synthesizing the N, N -isophthalic bis(piperonylic acid) dihydrazide (PAID) to be as a new crystallization accelerator for poly(L-lactide) (PLLA), and a detailed investigations of the non-isothermal crystallization, melting behavior, thermal decomposition behavior and mechanical properties of PLLA nucleated by PAID were performed applying differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and electronic tensile tester. The melt-crystallization proved that the PAID could act as a heterogeneous nucleating agent to significantly promote the crystallization in cooling, even the crystallization was still able to be accelerated upon the fast cooling at 50 oC/min. The final melt temperature was another crucial factor for PLLA�s melt crystallization, and when the final melt temperature was 170 oC, the onset crystallization temperature and melt-crystallization enthalpy was almost up to 150 oC and 56.8 J/g upon cooling of 1 oC/min, respectively. Furthermore, the chemical nucleation was proposed to be the nucleation mechanism of PAID for PLLA via the preliminary theoretical calculation. For the cold-crystallization, the addition of PAID exhibited an inhibition for the crystallization of PLLA, but the total crystallization process depended on the heating rate and PAID concentration. The single melting peak after cooling of 1 oC/min indicated that the crystallization had been thoroughly completed in cooling. Additionally, the single melting peak with different locations after full crystallization resulted from the different crystallization temperatures. A comparison in the onset decomposition temperature implied that the presence of PAID only slightly decreased the thermal stability of PLLA. The mechanical testing showed that, in contrast with the elongation at break, the existence of PAID enhanced the tensile strength of PLLA.

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“…Thus, in recent years, many organic small mass molecules, including myo-inositol (29), orotic acid monohydrate (30), benzoylhydrazine derivatives (31,32), 1H-benzotriazole derivatives (33,34), TMC series (35,36), dimethylbenzylidene sorbitol (37), were selected from commercial nucleating agents for other polymers and synthesized to evaluate their role in improving the crystallization of PLLA. Through unremitting efforts from international scientists, the organic small mass molecule nucleating agent is expected to be a promising alternative to inorganic nucleator due to its better nucleation ability (38) and compatibility. Overall, but the categories and number are still very insufficiency comparing with the inorganic nucleating agents (39).…”

Section: Introductionmentioning

confidence: 99%

N, N’-sebacic bis(hydrocinnamic acid) dihydrazide: A crystallization accelerator for poly(L-lactic acid)

2019

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Developing more organic nucleating agent with different molecular structure is very instructive to improve the crystallization of poly(L-lactic acid) (PLLA) and explore the crystallization mechanism. In this study, N, N’-sebacic bis(hydrocinnamic acid) dihydrazide (HAD) was synthesized to serve as a nucleating agent for PLLA. The effects of HAD on the non-isothermal crystallization, melting behavior, thermal stability and optical performance of PLLA were investigated by differential scanning calorimeter (DSC), thermogravimetric analysis (TGA), and light transmittance meter. The melt crystallization behavior showed that HAD was able to promote the crystallization of PLLA via heterogenous nucleation in cooling, and it was found that, upon the cooling of 1°C/min, the incorporation of 1 wt% HAD made the crystallization temperature and non-isothermal crystallization enthalpy increase from 94.5°C and 0.1 J/g to 131.6°C and 48.5 J/g comparing with the pure PLLA. Additionally, the melt crystallization significantly depended on the cooling rate and the final melting temperature. For the cold crystallization, when the nucleation density from HAD and PLLA itself was saturated, the influence of the HAD concentration on the cold crystallization process of the PLLA/HAD samples is negligible. The melting behavior after isothermal or non-isothermal crystallization further confirmed the crystallization accelerating effect of HAD for PLLA, and the appearance of the double melting peaks was attributed to the melting-recrystallization. Unfortunately, the addition of HAD decreased the thermal stability and light transmittance of PLLA.

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Insight into the role of bound water of a nucleating agent in polymer nucleation: a comparative study of anhydrous and monohydrated orotic acid on crystallization of poly(l-lactic acid)

Cited by 14 publications

References 57 publications

Supramolecular Interactions in Hybrid Polylactide Blends—The Structures, Mechanisms and Properties

Supramolecular Interactions in Hybrid Polylactide Blends—The Structures, Mechanisms and Properties

Insight into the Role of a Isophthalic Dihydrazide Derivative Containing Piperonylic Acid in Poly(L-lactide) Nucleation: Thermal Performances and Mechanical Properties

N, N’-sebacic bis(hydrocinnamic acid) dihydrazide: A crystallization accelerator for poly(L-lactic acid)

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