Filler-Reinforced Poly(Glycolic Acid) for Degradable Frac Balls Under High-Pressure Operation

Takahashi, Shigetoshi; Okura, Masayuki; Kobayashi, Takuma; Saijo, Hikaru; Takahashi, Takéo

doi:10.1007/978-3-319-21762-8_22

Cited by 1 publication

(2 citation statements)

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“…The glass transition temperature of PGA (35-45 C) is above the room temperature and allows high PGA content samples to withstand higher loads before the initiation of plastic deformation under room temperature conditions. Also, bulk PGA is characterized by a significantly higher compressive strength (200 MPa) 41 than PCL (39 MPa). 42 Despite high glass transition temperature and compressive strength (as reported in the literature), samples with high PGA content (P75) exhibited a sudden fracture after 10% compression, showing a compressive strength lower than P50 and P25 samples.…”

Section: Discussionmentioning

confidence: 99%

“…The glass transition temperature of PGA (35-45 C) is above the room temperature and allows high PGA content samples to withstand higher loads before the initiation of plastic deformation under room temperature conditions. Also, bulk PGA is characterized by a significantly higher compressive strength (200 MPa)41 than PCL (39 MPa) 42. Despite 50PGA) is related to the combined effect of PCL and PGA mechanical properties.…”

mentioning

confidence: 99%

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Load‐bearing biodegradable PCL‐PGA‐beta TCP scaffolds for bone tissue regeneration

et al. 2020

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A biocompatible and biodegradable scaffold with load-bearing ability is required to enhance the repair of bone defects by facilitating the attachment, and proliferation of cells, and vascularization during new bone formation. However, it is challenging to maintain the porosity and biodegradability, as well as mechanical properties (especially compressive strength), at the same time. Therefore, in the present work, a biodegradable composite structure of poly(caprolactone) (PCL) was designed using compression molding with varying amounts of poly(glycolic acid) (PGA) (25, 50, 75 wt%) and fixed amount (20 wt%) of beta tricalcium phosphate (beta TCP). It was hypothesized that the fabricated composite structure will develop porosity during the degradation of the PGA and that the corresponding decrease in mechanical properties will be compensated by new bone formation and ingrowth, in vivo. Accordingly, we have systematically studied the effects of sample composition on time-dependent dissolution and mechanical properties of the PGA/beta TCP scaffolds. The compressive strength increased up to 92 MPa at 50% compression of the designed PCL-PGA samples. Furthermore, the dissolution rate, as well as weight loss, was observed to increase with an increase in the PGA amount in PCL. Based on the mechanical properties and dissolution data, it is concluded that the PCL-PGA scaffolds with beta TCP can be suitable candidates for bone tissue engineering applications, specifically for the reconstruction of bone defects, where strength and biodegradation are both important characteristics.

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Section: Discussionmentioning

confidence: 99%

“…The glass transition temperature of PGA (35-45 C) is above the room temperature and allows high PGA content samples to withstand higher loads before the initiation of plastic deformation under room temperature conditions. Also, bulk PGA is characterized by a significantly higher compressive strength (200 MPa)41 than PCL (39 MPa) 42. Despite 50PGA) is related to the combined effect of PCL and PGA mechanical properties.…”

mentioning

confidence: 99%