Thermal degradation of poly(lactic acid) measured by thermogravimetry coupled to Fourier transform infrared spectroscopy

Zou, Hantao; Yi, Changhai; Wang, Luoxin; Liu, Hongtao; Xu, Weilin

doi:10.1007/s10973-009-0121-5

Cited by 197 publications

(136 citation statements)

References 32 publications

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“…Although scanning electron microscopy (SEM) has been used to analyze the morphological properties of fabricated PLA foams, it provides only an image of the scanned layer or the surface structure of the specimen rather than the overall integrated tissue reproduction and PLA degradation behaviors [16]. Thermal gravimetric analysis (TGA) [17] is a classical analytical technique that measures the weight change of a material as a function of temperature due to the chemical reactions of gas liberation or atmospheric absorption. Knowledge of decomposition kinetics [18] offers a rapid alternative to accelerate aging tests for evaluation of lifetime, material composition, oxidation, dehydration and corresponding kinetic constants for exploring the relation between the thermal behavior and microstructure [19].…”

mentioning

confidence: 99%

Kinetic evaluation of the size-dependent decomposition performance of solvent-free microcellular polylactic acid foams

Guo

Wang

et al. 2012

Chin. Sci. Bull.

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A thermal gravimetric method is described for evaluating the kinetics of cell size-dependent decomposition and lifetime estimation for microcellular tissue engineering scaffolds made of biodegradable polylactic acid (PLA) foams. PLA foam cell sizes from 550 to 20 m were fabricated experimentally using a solvent-free solid-state foaming technique under saturation pressures from 1 to 5 MPa. The thermal properties of the PLA foams with respect to the cell sizes were measured using thermal gravimetric analysis in a nitrogen atmosphere and the activation energy and pre-exponential factor were derived to evaluate the decomposition kinetics and estimate lifetime. It was found that small cell sizes can be achieved under high saturation pressures and that the thermal stability of PLA decreases after the fabrication process. The cell size-dependent thermal stability and degradation rate indicate that a PLA foam of larger cell sizes has a shorter degradation time, a few tenths that of the PLA raw material, at a temperature of 37°C. The results suggest that it is feasible to optimize fabrication parameters to obtain appropriate cell sizes and lifetimes that satisfy the application requirements for various organs. This study provides the basis for precise scaffold design and quantitative analysis of PLA foams in tissue engineering applications.tissue engineering scaffold, PLA foam, cell size, thermal gravimetric analysis, decomposition kinetic performance Citation:Guo G P, Ma Q Y, Wang F, et al. Kinetic evaluation of the size-dependent decomposition performance of solvent-free microcellular polylactic acid foams.

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mentioning

confidence: 99%

Kinetic evaluation of the size-dependent decomposition performance of solvent-free microcellular polylactic acid foams

Guo

Wang

et al. 2012

Chin. Sci. Bull.

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“…Platinum crucibles with pierced lids were used for the measurement. The mineral topaz consists nominally of Al 2 SiO 4 (F,OH) 2 where the exact amounts of F and OH are, however, not known in case of the measured sample. Above about 1,100°C, three mass loss steps of 1.1, 13.0, and 6.7 % were observed; maxima in the rate of mass change occurred at 1,196, 1,317, and 1,357°C.…”

Section: Application Examplesmentioning

confidence: 99%

“…The release of CO 2 can be seen from the maximum of the (dimensionless) CO 2 trace detected in the same temperature range. Again, the integrated FT-IR absorbance in the range of 2,200-2,450 cm -1 was used where CO 2 shows the strongest absorbance of infrared radiation. The substance CaCO 3 is certainly a sample which does not require an independent quantification of the evolved gas since CO 2 is the only gas released during the decomposition.…”

Section: Quantification Of Evolved Gasesmentioning

confidence: 99%

“…The well-known substance NaHCO 3 decomposes in the temperature range between about 100 and 200°C releasing CO 2 and H 2 O at the same time. FT-IR traces were calculated integrating the FT-IR absorbance in the range of 2,200 and 2,450 cm -1 for CO 2 and in the range between 3,400 and 4,000 cm -1 for H 2 O. In the linear regime, the integral of the FT-IR traces (peak area) should be proportional to the mass loss or-in other words-the peak area divided by the mass loss should be constant.…”

Section: Quantification Of Evolved Gasesmentioning

confidence: 99%

“…The FT-IR technique which detects the infrared absorbance of molecules due to their vibrational modes is a sensitive and very selective method especially for organic molecules. It is therefore widely used for investigation of the decomposition of polymers [2] or biomass samples [3]. Upon heating, ceramic and inorganic samples release mostly gases like H 2 O, NH 3 , CO 2 , or SO 2 which can also be detected and distinguished via their characteristic infrared spectra.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A novel direct coupling of simultaneous thermal analysis (STA) and Fourier transform-infrared (FT-IR) spectroscopy

Strobel¹,

Neumann²,

Rager

et al. 2013

J Therm Anal Calorim

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Evolved gas analysis (EGA) from thermal analyzers such as thermogravimetry (TG) or simultaneous thermal analysis (STA) which refers to simultaneous TG-DSC is well established since it greatly enhances the value of TG or TG-DSC results. The sensitive and selective FT-IR technique is in particular useful for the analysis of organic molecules but also for infrared active permanent gases evolved during most decomposition processes. The coupling interface between thermal analyzers and FT-IR spectrometers usually consists of heated adapters and a flexible, heated transfer line. In this work, a novel direct coupling of an STA instrument and an FT-IR spectrometer without a transfer line is presented. A very small FT-IR spectrometer is directly mounted on top of the STA furnace leading to a compact and fully integrated STA-FT-IR coupling system. The possibilities and the value of simultaneous STA-FT-IR measurements are demonstrated for organic, biomass, and ceramic samples in the temperature range between room temperature and about 1,500°C. Various samples from the field of inorganics and organics-especially polymers-were furthermore measured showing the advantages of the direct STA-FT-IR coupling compared to state-of-the-art STA-FT-IR coupling using a heated transfer line: we found that the time delay caused by the volume of the transfer line itself is rather negligible whereas a significantly better correlation between gas detection and TG results was observed in case of some highly condensable decomposition gases. Aspects of quantification of evolved gases are furthermore discussed as well as the known nonlinearity of FT-IR detection at higher gas concentrations.

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Additive Manufacturing of Electronics from Silver Nanopowders Sintered on 3D Printed Low‐Temperature Substrates.

Wałpuski

Słoma

2021

Adv Eng Mater

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Additive manufacturing is more widely used these days in aerospace, power industry, and automotive. The latest reports indicate that electronics can be produced with this technique. This approach requires the development of new materials for the fabrication of conductive metallic layers on polymers. Herein, a hybrid technique based on fused deposition modeling, direct‐write, and selective laser sintering is demonstrated, for the fabrication of structural electronics. Highly conductive paths are obtained with conductivity values up to 3.2·106 S m−1 in a single printing and sintering additive process. The influence of process parameters is evaluated with several 3D printed polymer substrates affecting the electrical conductivity of the printed conductive paths and circuits. The developed hybrid technique allows performing selective thermal sintering of metallic pastes on polymer substrates exhibiting the value of melting temperatures much lower than the sintering temperature of the silver paste. This phenomenon can be explained with the proposed hypothesis that the activation energy of the sintering process of metallic paste and degradation of polymer substrate plays a key role in obtaining functional conductive metallic paths on polymer substrates. Application of the developed process is demonstrated with a simple human interface device and a circuit with light‐emitting diodes and power source.

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Thermal degradation of poly(lactic acid) measured by thermogravimetry coupled to Fourier transform infrared spectroscopy

Cited by 197 publications

References 32 publications

Kinetic evaluation of the size-dependent decomposition performance of solvent-free microcellular polylactic acid foams

Kinetic evaluation of the size-dependent decomposition performance of solvent-free microcellular polylactic acid foams

A novel direct coupling of simultaneous thermal analysis (STA) and Fourier transform-infrared (FT-IR) spectroscopy

Additive Manufacturing of Electronics from Silver Nanopowders Sintered on 3D Printed Low‐Temperature Substrates.

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