Study of Crystallinity and Conformation of Poly(lactic acid) by Terahertz Spectroscopy

Zhu, Zhenqi; Bian, Yujing; Zhang, Xun; Zeng, Ruonan; Yang, Bin

doi:10.1021/acs.analchem.2c02652

Cited by 24 publications

(10 citation statements)

References 53 publications

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“…The diffraction peak intensity and half peak width, however, were different in all five CdAl-LDHs. According to Zhu’s report, the crystallinity of LDHs can be calculated based on the integral area of the crystalline and amorphous regions . That is, the crystallinity can be calculated using the following equation: X c = I crystal /( I crystal + I amorphous )*100%, where Χ c is the crystallinity, I crystal is the integrated intensity of all crystal peaks, and I amorphous is the integrated intensity of amorphous scattering.…”

Section: Resultsmentioning

confidence: 99%

“…According to Zhu's report, the crystallinity of LDHs can be calculated based on the integral area of the crystalline and amorphous regions. 26 That is, the crystallinity can be calculated using the following equation: X c = I crystal /(I crystal + I amorphous )*100%, where Χ c is the crystallinity, I crystal is the integrated intensity of all crystal peaks, and I amorphous is the integrated intensity of amorphous scattering. The crystallinities of these five CdAl-LDHs were calculated to be 30.8, 38.8, 41.3, 48.4, and 59.2%, respectively.…”

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confidence: 99%

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Electron Transfer Efficiency-Regulated Electrochemiluminescence for Rapid Crystallinity Analysis in Layered Materials

Jia,

Fan,

et al. 2024

Anal. Chem.

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The electrochemiluminescence (ECL) signal is largely determined by the electron transfer efficiency. Therefore, in the nanomaterial-involved ECL system, the structure-related electron distribution could affect the electron transfer efficiency and further alter the ECL intensity. These features make the design of versatile ECL-based analytical techniques for probing the correlated structure possible. And it is generally accepted that the increased crystallinity of nanomaterials usually leads to a uniform electron distribution, which provides higher conductivity. Therefore, the crystallinity-improved conductivity could facilitate electron transfer, promote the electrochemical activity of support materials, and boost the efficiency of the ECL reaction. In this study, we have demonstrated that the ECL signal of the graphitic carbon nitride reporter was proportional to the crystallinity of layered double hydroxides (LDHs), which meets the supposition well. On the basis of this phenomenon, an ECL-based crystallinity analysis approach has been established using CdAl-LDHs as the model materials. The universality of this proposed technique was further validated by the rapid and accurate crystallinity determination of ZnAl-LDH samples with diverse crystallinities. This work not only contributes an alternative to the X-ray diffraction technique for the rapid screening of crystallinity in layered materials but also opens a new avenue for the design of ECL-based structure analysis techniques toward nanomaterials and even organic materials by involving electron transfer regulation correlation.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Electron Transfer Efficiency-Regulated Electrochemiluminescence for Rapid Crystallinity Analysis in Layered Materials

Jia,

Fan,

et al. 2024

Anal. Chem.

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“…It is worth noting that the effect of the supramolecular changes in the amorphous 3D-printed materials under the accelerated hydrolysis regime is rapid and disregards progressive structural transformation through the formation of the meso -phase and α’ form [ 46 ], and if these forms appear, they occur before the first 24 h. Observed changes at the supramolecular level explain the apparent microtomographic effects associated with thermal shrinkage. The rapid orientation of the supramolecular structure to the highly crystalline and highly oriented α form causes the sample to undergo thermal shrinkage in the absence of external stress, which is a known consequence of the thermal processing of PLA materials [ 47 , 48 ]. The WAXD results, therefore, are related to the micro-CT observations, in which the shrinkage is visible inside the samples in the first part of the experiment up to the 10th day.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the Hydrolytic Degradation Kinetics of 3D-Printed PLA Structures under a Thermally Accelerated Regime

Klimczuk,

Rudnicka,

Owczarek

et al. 2024

Materials

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The application of biobased and biodegradable polymers, such as polylactide (PLA), in fused deposition modeling (FDM) 3D-printing technology creates a new prospect for rapid prototyping and other applications in the context of ecology. The popularity of the FDM method and its significance in material engineering not only creates new prospects for the development of technical sciences on an industrial scale, but also introduces new technologies into households. In this study, the kinetics of the hydrolytic degradation of samples obtained by the FDM method from commercially available PLA filaments under a thermally accelerated regime were analyzed. The investigation was conducted at the microstructural, supramolecular, and molecular levels by using methods such as micro-computed tomography (micro-CT), wide-angle X-ray diffraction (WAXD), viscosimetry, and mass erosion measurements. The obtained results clearly present the rapid structural changes in 3D-printed materials during degradation due to their amorphous initial structure. The complementary studies carried out at different scale levels allowed us to demonstrate the relationship between the observed structural changes in the samples and the hydrolytic decomposition of the polymer chains, which made it possible to scientifically understand the process and expand the knowledge on biodegradation.

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“…The XRD profiles for all materials show that they all present a PLA matrix with high crystallinity. From the XRD profile of PLA ( Figure 3 a), one can see three distinct diffraction peaks located at 16.9°, 19.3°, and 22.5°, corresponding to the (110/200), (203), and (210) planes, respectively, of the PLA α form [ 33 ]. With an increase in immersion time, the PLA profile reveals a shift in peak positions to a higher 2θ value.…”

Section: Resultsmentioning

confidence: 99%

The Structural, Thermal and Morphological Characterization of Polylactic Acid/Β-Tricalcium Phosphate (PLA/Β-TCP) Composites upon Immersion in SBF: A Comprehensive Analysis

Ftiti,

Cifuentes,

Guidara

et al. 2024

Polymers

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Biocomposite films based on PLA reinforced with different β-TCP contents (10%, 20%, and 25%wt.) were fabricated via solvent casting and immersed in SBF for 7, 14, and 21 days. The bioactivity, morphological, and thermal behavior of composites with immersion were studied using scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) microanalysis, weight loss (WL), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and gel permeation chromatography (GPC). This broad analysis leads to a deeper understanding of the evolution of the polymer–filler interaction with the degradation of the biocomposites. The results showed that β-TCP gradually evolved into carbonated hydroxyapatite as the immersion time increased. This evolution affected the interaction of β-TCP with PLA. PLA and β-TCP interactions differed from PLA and carbonated hydroxyapatite interactions. It was observed that β-TCP inhibited PLA hydrolysis but accelerated the thermal degradation of the polymer. β-TCP retarded the cold crystallization of PLA and hindered its crystallinity. However, after immersion in SBF, particles accelerated the cold crystallization of PLA. Therefore, considering the evolution of β-TCP with immersion in SBF is crucial for an accurate analysis of the biocomposites’ degradation. These findings enhance the comprehension of the degradation mechanism in PLA/β-TCP, which is valuable for predicting the degradation performance of PLA/β-TCP in medical applications.

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Study of Crystallinity and Conformation of Poly(lactic acid) by Terahertz Spectroscopy

Cited by 24 publications

References 53 publications

Electron Transfer Efficiency-Regulated Electrochemiluminescence for Rapid Crystallinity Analysis in Layered Materials

Electron Transfer Efficiency-Regulated Electrochemiluminescence for Rapid Crystallinity Analysis in Layered Materials

Investigation of the Hydrolytic Degradation Kinetics of 3D-Printed PLA Structures under a Thermally Accelerated Regime

The Structural, Thermal and Morphological Characterization of Polylactic Acid/Β-Tricalcium Phosphate (PLA/Β-TCP) Composites upon Immersion in SBF: A Comprehensive Analysis

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