Melting parameters of poly(glycolic acid)

Nakafuku, Chitoshi; Yoshimura, Hitomichi

doi:10.1016/j.polymer.2004.03.041

Cited by 43 publications

(38 citation statements)

References 8 publications

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“…As can be noted, the plot shows a good linearity and this result can be considered a further proof of the random nature of the copolymers investigated as well as of the exclusion of the co‐units from the crystalline lattice of PGA. The T

_{m}^{0}

and the Δ H

_{m}^{0}

values estimated on the basis of Baur's equation were found to be 248 °C and 150 J/g, in excellent agreement with the ones reported in the literature for PGA homopolymer 27…”

Section: Resultssupporting

confidence: 87%

“…The T 0 m and the DH 0 m values estimated on the basis of Baur's equation were found to be 248 C and 150 J/g, in excellent agreement with the ones reported in the literature for PGA homopolymer. 27 To get preliminary results on the effect of composition on the crystallization rate of PGA, nonisothermal experiments were carried out, subjecting the samples to the thermal treatment described in the Experimental Section. It is worth remembering that the half-time of primary crystallization in isothermal experiments correlates with the temperature corresponding to the maximum of the crystallization peak in nonisothermal experiments (T cc ), 28 being this latter more easily obtainable.…”

Section: Thermal Propertiesmentioning

confidence: 99%

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(2‐Hydroxy isobutyric) acid containing poly(glycolic acid): Structure–properties relationship

Soccio

Lotti

Finelli

et al. 2010

J Polym Sci B Polym Phys

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Poly(glycolic acid) (PGA) and a series of novel random copolymers of PGA containing 2-hydroxyisobutyrric acid (PGAPHIB) (HIB unit content from 1.5 to 7.4 mol %) were synthesized and characterized in terms of chemical structure and molecular weight. Afterward, the polyesters were examined by thermogravimetric analysis, differential scanning calorimetry, and X-ray diffraction techniques. The copolymers, which displayed a better thermal stability than PGA, at room temperature appeared as semicrystalline materials: the main effect of copolymerization was a lowering in the amount of crystallinity and a decrease of the melting temperature with respect to homopolymer PGA. Baur's equation described well the T m -composition data. X-ray diffraction measurements allowed the identification of the PGA crystalline structure in all cases. After melt quenching, semicrystalline samples were obtained with the exception of PGAPHIB7.4 copolymer. The introduction of HIB units decreased the crystallization rate compared with pure PGA.

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_{m}^{0}

and the Δ H

_{m}^{0}

values estimated on the basis of Baur's equation were found to be 248 °C and 150 J/g, in excellent agreement with the ones reported in the literature for PGA homopolymer 27…”

Section: Resultssupporting

confidence: 87%

Section: Thermal Propertiesmentioning

confidence: 99%

(2‐Hydroxy isobutyric) acid containing poly(glycolic acid): Structure–properties relationship

Soccio

Lotti

Finelli

et al. 2010

J Polym Sci B Polym Phys

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show abstract

“…The repeating unit is glycolic acid found in some sugar crops (Figure ) . Polyglycolic acid is a rigid, very crystalline thermoplastic polymer (45%‐55%) and has a melting temperature around 225°C to 230°C . PGA is not soluble in most of the organic solvents due to its very high crystallinity.…”

Section: Introductionmentioning

confidence: 99%

Polyglycolic acid copolymers from one‐step cationic polymerization of formaldehyde, carbon monoxide, and epoxides derived from PEG

Reyhanoglu

Göktürk

2019

Polymers for Advanced Techs

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Biodegradable polyglycolic acid (PGA) is conventionally produced via the ring‐opening polymerization of glycolide, the cyclic dimer form of glycolic acid, in the presence of mostly tin‐based catalyst initiators which are rather known to be cytotoxic materials. Our previous studies revealed an alternative method for the synthesis of PGA from the perfectly alternating copolymerization of formaldehyde (from trioxane) and carbon monoxide (CO) under BrØnsted acidic conditions. The poor physical properties of PGA (insolubility in many organic solvents, brown color, etc.) limit its use in other marketing applications in the industry. To improve on the physical properties of PGA, such as solubility and appearance, copolymerization of trioxane, CO, and a minor amount of epoxides derived from polyethylene glycol (PEG) were performed under the same reaction conditions for PGA synthesis (in DCM, at 800 psi CO pressure, with triflic acid catalyst, reaction duration of 72 hours). The results have shown that the addition of minor quantities of epoxide comonomers vastly improves the appearance of the obtained PGA copolymers and allows for the control of the polymeric properties, such as solubility and melting temperature.

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“…The uniaxially stretched PGA fiber has been successfully used as bio-absorbable suture materials for closing surgical wounds because of the high biodegradability and biocompatibility. [1][2][3] However, one of the main disadvantages of PGA fiber is narrow window of processing conditions and therefore this suture has been used as a multi filament made of yarn which bound some of thin fibers. In order to improve such a problem, it seems important to accumulate the structural information on uniaxially stretched PGA fiber in atomic level.…”

mentioning

confidence: 99%

Detection of Poorly-Oriented Component in Uniaxially Stretched Poly(glycolic acid) Fiber Studied Using 13C Solid-State NMR

et al. 2009

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Melting parameters of poly(glycolic acid)

Cited by 43 publications

References 8 publications

(2‐Hydroxy isobutyric) acid containing poly(glycolic acid): Structure–properties relationship

(2‐Hydroxy isobutyric) acid containing poly(glycolic acid): Structure–properties relationship

Polyglycolic acid copolymers from one‐step cationic polymerization of formaldehyde, carbon monoxide, and epoxides derived from PEG

Detection of Poorly-Oriented Component in Uniaxially Stretched Poly(glycolic acid) Fiber Studied Using 13C Solid-State NMR

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