Degradation of high molecular weight poly(l-lactide) in alkaline medium

Cam, Darinn; Hyon, Suong‐Hyu; Ikada, Yoshito

doi:10.1016/0142-9612(95)94144-a

Cited by 232 publications

(146 citation statements)

References 21 publications

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“…This result on the fibers' surface is remarkably similar to that on the surface of PLA films by alkali treatment [21]. Moreover, the degradation rates of these three samples were low because of the absence of decay-accelerating species such as enzymes, bacteria, and H3O + [29]. Notably, however, other authors have reported that the mass of PLA remained almost unchanged for up to 12 months in PBS [30,31].…”

Section: Surface Characterizationsupporting

confidence: 57%

Preparation and Characterization of Chitosan-Coated Poly(l-Lactic Acid) Fibers and Their Braided Rope

Furuike

Nagahama

Chaochai

et al. 2015

Fibers

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Novel chitosan (CS)-coated poly(L-lactic acid) (PLA) fibers (CS-PLA) were prepared by reaction of an alkali and CS under heat treatment without a chemical binder. These treatments induced hydrolysis on the PLA surface, formation of ionic bonds between the carboxyl groups of the PLA surface and the amino groups of CS, and dehydration between the carboxyls and amines. The prepared fibers were characterized by scanning electron microscopy and mechanical strength tests. The presence of CS on the fiber surface was observed by the visual test of CS-PLA with amido black 10B and confirmed by the amine ratio obtained by X-ray photoelectron spectroscopy. The coating thickness of CS on the surface of the PLA fibers was approximately 28 nm, as determined from calculations based on the results of Kjeldahl nitrogen analysis and elemental analysis. The degradation properties of CS-PLA were also investigated. These properties were apparently enhanced by hydrophilicity resulting from the CS-coating treatment. Furthermore, braided ropes prepared using CS-PLA became tight with increasing number of core ropes. Results indicate that the objective tensile strength and flexibility of the braided rope could be controlled by adjusting the number of core fibers.

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Section: Surface Characterizationsupporting

confidence: 57%

Preparation and Characterization of Chitosan-Coated Poly(l-Lactic Acid) Fibers and Their Braided Rope

Furuike

Nagahama

Chaochai

et al. 2015

Fibers

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“…The aim of accelerated degradation systems is to accomplish the degradation of polymeric devices within a shorter period of time, thus enabling the study of morphological and chemical changes during degradation in a more acceptable timeframe. [4,10,11]. In this way, researchers may anticipate analogous results by altering the rate of reaction whilst maintaining identical principal mechanisms of reaction.…”

Section: Introductionmentioning

confidence: 89%

Hydrolytic and enzymatic degradation of a poly(ε-caprolactone) network

Castilla-Cortázar¹,

Más-Estellés²,

Dueñas³

et al. 2012

Polymer Degradation and Stability

144

116

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Long-term hydrolytic and enzymatic degradation profiles of poly(ε-caprolactone) (PCL) networks were obtained. The hydrolytic degradation studies were performed in water and phosphate buffer solution (PBS) for 65 weeks. In this case, the degradation rate of PCL networks was faster than previous results in the literature on linear PCL, reaching a weight loss of around 20% in 60 weeks after immersing the samples either in water or PBS conditions. The enzymatic degradation rate in Pseudomonas Lipase for 14 weeks was also studied, with the conclusion being that the degradation profile of PCL networks is lower than for linear PCL, also reaching a 20% weight loss. The weight lost, degree of swelling, and calorimetric and mechanical properties as a function of degradation time were obtained. Furthermore, the morphological changes in the samples were studied carefully through electron microscopy and crystal size through X-ray diffraction. The changes in some properties over the degradation period such as crystallinity, crystal size and Young's modulus were smaller in the case of enzymatic studies, highlighting differences in the degradation mechanism in the two studies, hydrolytic and enzymatic.

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“…A decrease in the transparency of the studied sample surfaces (assumed to be caused by molecular reorganisation 55 or an increase in irregularity, which might result from the accelerated formation of new spherulites 56 ) was observed for all the PLA-based rigid films from the beginning of the degradation process in paraffin. For a thicker rigid PLA film, this process is considerably faster than for the thin PLA film used in the previous degradation experiments.…”

Section: Macroscopic Evaluationmentioning

confidence: 99%

Forensic Engineering of Advanced Polymeric Materials. Part 1 – Degradation Studies of Polylactide Blends with Atactic Poly[(R,S)-3-hydroxybutyrate] in Paraffin

Rydz

Wolna-Stypka

Adamus

et al. 2015

Chem.Biochem.Eng.Q.

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The degradation of the advanced polymeric materials: blends of polylactide with poly[(R,S)-3-hydroxybutyrate] was studied in paraffin (an ingredient used in cosmetics) and compared with the degradation of pure poly[(R,S)-3-hydroxybutyrate]. The interaction between the polymeric materials studied and the paraffin was monitored during the degradation experiments, and the effects of this interaction were reported. Gel permeation chromatography, atomic force microscopy, electrospray mass spectrometry, nuclear magnetic resonance, differential scanning calorimetry and thermal gravimetric analysis revealed that degradation of the investigated materials occurs in the presence of paraffin. In the blends, poly[(R,S)-3-hydroxybutyrate] content was found to extend the disintegration time, and for the blends with good miscibility, reduced the degradation rate in the first step of degradation.

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Degradation of high molecular weight poly(l-lactide) in alkaline medium

Cited by 232 publications

References 21 publications

Preparation and Characterization of Chitosan-Coated Poly(l-Lactic Acid) Fibers and Their Braided Rope

Preparation and Characterization of Chitosan-Coated Poly(l-Lactic Acid) Fibers and Their Braided Rope

Hydrolytic and enzymatic degradation of a poly(ε-caprolactone) network

Forensic Engineering of Advanced Polymeric Materials. Part 1 – Degradation Studies of Polylactide Blends with Atactic Poly[(R,S)-3-hydroxybutyrate] in Paraffin

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