Technical Note: On modelling thermo-chemical degradation of poly(lactic acid)

Khanlou, Hossein Mohammad; Hall, Wayne; Heitzman, Michael T.; Summerscales, John; Woodfield, Peter

doi:10.1016/j.polymdegradstab.2016.09.033

Cited by 8 publications

(13 citation statements)

References 14 publications

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“…where M n-avg is the number-average molar mass of polymers in the matrix and m 0 is the molar mass of a single monomer unit. To estimate M n-avg , a statistical model for the polymer considered both degradation and recombination reactions which occur during the thermal processing as proposed by Wachsen [22] and revised by Yu et al [23] and Khanlou et al [8].…”

Section: Thermo-chemical Degradation Of Matrix (Depolymerisation Via mentioning

confidence: 99%

“…xd apply to polymers of any length. Table 2 shows the values for kinetic parameters and initial conditions for modelling polymer degradation of PLA, which are calculated or extracted from the literature [8,21]; and Fig. 1 shows changes of DP of PLA at various temperatures and times.…”

Section: Thermo-chemical Degradation Of Matrix (Depolymerisation Via mentioning

confidence: 99%

“…To calculate λ 0 for isothermal processing conditions, an analytical solution, Eq. 6, was developed by separating the variables [8]:…”

Section: Thermo-chemical Degradation Of Matrix (Depolymerisation Via mentioning

confidence: 99%

“…Unlike carbon and glass fibre composites where the fibre is robust to composite manufacturing temperature, natural fibres degrade quickly when exposed to temperatures as low as 160°C [3], 180°C [4], 180-190°C [1] or 180-200°C [5]. Bio-matrices also suffer a similar problem in comparison with synthetic polymers [2,[6][7][8]. Compression molding is a common method in which setting an appropriate temperature (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of mechanical property degradation of poly(lactic acid) and flax fibre reinforced poly(lactic acid) bio-composites during thermal processing

et al. 2018

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Thermal degradation and chemical degradation are among the key issues affecting mechanical properties and ultimately utilization of natural fibre reinforced polymer (NFRP) bio-composites. In our previous work, mathematical models were used to identify thermal processing boundaries and to recognize an optimized window for NFRP bio-composites. In this study, a correlation relating the tensile strength of flax/PLA bio-composite to the processing temperature history is proposed. For the first time, an existing linear model, which corresponds to the tensile strength of natural polymers and their degree of polymerization, has been combined with reaction kinetics to predict the tensile strength of NFRP biocomposites as a function of processing temperature history. In addition, a non-linear model has been proposed which shows a significant improvement for longer periods of time, compared with the linear model. The model is based on the underlying thermo-chemical degradation processes occurring during manufacture of NFRP bio-composites. The model is capable of predicting the tensile strength of the bio-composite within 10% error.

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Section: Thermo-chemical Degradation Of Matrix (Depolymerisation Via mentioning

confidence: 99%

Section: Thermo-chemical Degradation Of Matrix (Depolymerisation Via mentioning

confidence: 99%

“…To calculate λ 0 for isothermal processing conditions, an analytical solution, Eq. 6, was developed by separating the variables [8]:…”

Section: Thermo-chemical Degradation Of Matrix (Depolymerisation Via mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Estimation of mechanical property degradation of poly(lactic acid) and flax fibre reinforced poly(lactic acid) bio-composites during thermal processing

et al. 2018

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“…Hence, efforts have been made continually to accurately measure the length distribution of the fibers, especially as raw materials for textile processes and other applications. 3–12…”

mentioning

confidence: 99%

Algorithm for measuring fiber length distributions of raw cotton and combed wool using dual-beard image method

Lang

Pan

et al. 2020

Textile Research Journal

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The dual-beard image method, which has been developed in recent years as a fast and economical method for fiber length measurement, consists of dual-beard specimen preparation, image processing, fibrogram extraction, and length parameter calculations. However, one of the shortcomings of this method is that it can only produce extremely limited length parameters such as mean length, coefficient of variation, modal length, and quality length (UHML, upper half mean length). This study introduces a new algorithm for converting the dual-beard fibrogram into a length distribution histogram which can be used to calculate most of the current length parameters. The algorithm is based on the short fiber content formulae but modified by theoretical analysis and experimental comparison. The length distributions of 24 cotton samples and 12 wool samples are measured by dual-beard image method with the new algorithm, and Advanced Fiber Information System (AFIS) and Almeter are employed for comparison. Comparative analysis shows that the peaks and ranges of the distribution histograms using the dual-beard method are similar to those from the reference methods, and the shapes of histograms from difference methods match well with one another. In addition, five length parameters calculated from the dual-beard distributions are verified to be consistent with those measured by AFIS and Almeter. The new algorithm employed in the dual-beard image method avoids the differential operation which amplifies the curve error, giving the dual-beard image method the ability to output more comprehensive length information.

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Effect of Time-Dependent Process Temperature Variation During Manufacture of Natural-Fibre Composites

Khanlou

Woodfield

Hall

et al. 2017

Advances in Natural Fibre Composites

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Technical Note: On modelling thermo-chemical degradation of poly(lactic acid)

Cited by 8 publications

References 14 publications

Estimation of mechanical property degradation of poly(lactic acid) and flax fibre reinforced poly(lactic acid) bio-composites during thermal processing

Estimation of mechanical property degradation of poly(lactic acid) and flax fibre reinforced poly(lactic acid) bio-composites during thermal processing

Algorithm for measuring fiber length distributions of raw cotton and combed wool using dual-beard image method

Effect of Time-Dependent Process Temperature Variation During Manufacture of Natural-Fibre Composites

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