Thermal and mechanical properties of poly(L-lactic acid) nucleated with N,N’-bis(phenyl) 1,4-naphthalenedicarboxylic acid dihydrazide

Zhao, Lisha; Qiao, Jun; Chen, Wei; Cai, Yan‐Hua

doi:10.14314/polimery.2021.4.3

Cited by 4 publications

(3 citation statements)

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“…The evolutions of T g and T m shown in Figure 1E make it clear that PLLA and TAIC are thermodynamically miscible blends. According to our analysis of the SEM and DSC results, the miscibility between PLLA and TAIC is confirmed, which agrees with results previously reported in the literature [29][30][31][32]. This will be the basis for the following investigation of inclusion and exclusion behaviors of TAIC during the crystallization of PLLA.…”

Section: Resultssupporting

confidence: 91%

Inclusion/Exclusion Behaviors of Small Molecules during Crystallization of Polymers in Miscible PLLA/TAIC Blend

et al. 2022

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In this work, PLLA/TAIC has been taken as a model system to investigate the inclusion and exclusion of small molecules during the crystallization of polymers in their miscible blend. Our results indicate that it is the growth rate and diameter of PLLA spherulites that dominate the localization of TAIC. On the one hand, crystallization temperature plays an important role. Crystallization at higher temperature corresponds to higher growth rates and a greater diameter of PLLA spherulites. The former improves the ability of PLLA crystals to trap TAIC while the latter leads to a lower volume fraction of space among neighboring PLLA spherulites. The combination of the two contributes to the enhanced inclusion behaviors. On the other hand, when compared to melt crystallization, cold crystallization results in much smaller spherulites (from higher nucleation density) and sufficient space among spherulites, which accounts for the enrichment of TAIC in interspherulitic regions and for its enhanced exclusion. In the adopted polymer–small molecule blend, TAIC can enrich in interspherulitic regions even in its miscible blend with PLLA, which can be attributed to its stronger diffusion ability.

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Section: Resultssupporting

confidence: 91%

Inclusion/Exclusion Behaviors of Small Molecules during Crystallization of Polymers in Miscible PLLA/TAIC Blend

et al. 2022

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“…1, they are the acylation reaction of dodecanedioic acid and the amination reaction of phenylacetic hydrazide with dodecanedioyl dichloride. The detailed synthetic operation was similar to our previous works [36,37], and the final khaki DAPH was dried over night at 45 C under a vacuum to thoroughly remove residual water. Fourier Transform Infrared Spectrometer (FT-IR) υ: 3209.9, 3031.9, 2923.…”

Section: Synthesis Of Daph and Preparation Of Plla/daphmentioning

confidence: 99%

The Nucleated Poly(L-lactic acid): The Role of a Phenylacetic Hydrazide Derivative

TAN,

LV,

HUANG

et al. 2024

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The melt-crystallization, cold-crystallization, melting behaviors, thermal stability, and optical properties of poly(L-lactic acid) (PLLA) nucleated by a phenylacetic hydrazide derivative (DAPH) were investigated. The melt-crystallization confirmed DAPH’s heterogeneous nucleation role in improving PLLA’s poor crystallization capability, concurrently DAPH loading, cooling rate and final melting temperature were three key factors affecting PLLA’s melt-crystallization behaviors. The results from cold-crystallization indicated that the addition of DAPH could accelerate PLLA’s cold-crystallization via cold-crystallization peak’s shift toward the lower temperature side as DAPH loading increased. Through analysis of PLLA/DAPH’s multiple melting behaviors after melt-crystallization, it was found that DAPH loading, the previous melt-crystallization and heating rate determined PLLA/DAPH’s melting processes after melt-crystallization; and PLLA/DAPH’s melting processes after isothermal crystallization depended on the previous crystallization temperature. A drop in thermal decomposition temperature for 5 wt.% mass loss suggested that pure PLLA has better thermal stability compared with PLLA/DAPH. Additionally, the introduction of DAPH could not improve PLLA’s transparency, in contrast, the haze of PLLA was increased greatly owing to the existence of DAPH.

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“…Especially nucleating agent with organic structure has huge demand in the recent years owing to its designability of organic structure, relatively better compatibility with PLLA matrix compared to inorganic nucleating agent, and increasing market share in PLLA nucleating agent industry. Our and other research groups have developed and studied various organic nucleating agents based on different organic molecular structures [31][32][33][34][35][36][37][38], as a typical example, Li et al [39] synthesized a good nucleating agent named furan-phosphamide derived from furfurylamine and phosphorus oxychloride, and upon the addition of 5 wt% furan-phosphamide in PLLA matrix, the half-time of crystallization could decrease from 6.41 min to 1.27 min at crystallization temperature of 105 °C while the crystallinity was increased to 50.0%. Non-isothermal crystallization of PLLA/furan-phosphamide composites further showed that, with increasing of furan-phosphamide loading, PLLA/furanphosphamide composites had lower activation energy values, implying easier transformation for PLLA chains from molten into crystallization.…”

Section: Introductionmentioning

confidence: 99%

Nucleating Agents to Enhance Poly(L-lactide) Crystallization and Melting Behavior of Modified Poly(L-lactide)

Huang¹,

Wang²,

Cai³

et al. 2023

Mater. Plast.

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Melt processing poly(L-lactide) (PLLA) with a nucleating agent has been thought to be one of the most effective route to enhance PLLA s crystallization and heat resistance. In the current work, a newly-developed organic nucleating agent named N, N -bis(2-picolinyl) 1, 4-naphthalenedicarboxylic acid dihydrazide (NCAPH) was synthesized to investigate its effects on PLLA�s crystallization and melting behaviors. It is proved that NCAPH as an organic crystallization nucleating agent could provide large number of crystallization nucleation sites to improve PLLA�s crystallization, as observed from DSC and POM measurements. The result from melt-crystallization processes further showed that the final melting temperature and cooling rate were two important factors for affecting PLLA�s melt-crystallization behaviors in cooling, and the theoretical calculation result of frontier orbital energy indicated there existed probable intermolecular interaction between N-H of NCAPH and C=O of PLLA, which was proposed as nucleation mechanism of NCAPH for promoting PLLA�s crystallization. The melting behaviors of PLLA/NCAPH after non-isothermal crystallization or isothermal crystallization further confirmed the positive effects of NCAPH and NCAPH�s loading for the crystallization of PLLA, meantime, the melting behaviors depended on the heating rate, crystallization temperature, crystallization time, etc.

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Thermal and mechanical properties of poly(L-lactic acid) nucleated with N,N’-bis(phenyl) 1,4-naphthalenedicarboxylic acid dihydrazide

Cited by 4 publications

References 0 publications

Inclusion/Exclusion Behaviors of Small Molecules during Crystallization of Polymers in Miscible PLLA/TAIC Blend

Inclusion/Exclusion Behaviors of Small Molecules during Crystallization of Polymers in Miscible PLLA/TAIC Blend

The Nucleated Poly(L-lactic acid): The Role of a Phenylacetic Hydrazide Derivative

Nucleating Agents to Enhance Poly(L-lactide) Crystallization and Melting Behavior of Modified Poly(L-lactide)

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