Effect of thermal annealing on crystal structure and properties of PLLA/PCL blend

Chen, Jin; Deng, Chengji; Hong, Rui; Fu, Qiang; Zhang, Jie

doi:10.1007/s10965-020-02206-1

Cited by 25 publications

(20 citation statements)

References 49 publications

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“…The preponderance of PLA practical applications requires the use of PLA in combination with additives to mitigate its drawbacks: low HDT and small impact strength [ 13 , 33 , 34 , 35 ]. The low HDT results mainly from the reduced glass transition temperature of PLA (50 °C to 70 °C) and the reduced crystallization rate during processing.…”

Section: Poly(lactic Acid) (Pla)—general Outlookmentioning

confidence: 99%

Dynamic Mechanical Analysis Investigations of PLA-Based Renewable Materials: How Are They Useful?

Cristea¹,

Ionita²,

Iftime³

2020

Materials

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Interest in renewable polymers increased exponentially in the last decade and in this context poly(lactic acid) (PLA) became the leader mainly for practical reasons. Nevertheless, it is outstanding also from a scientific point of view, because its thermal and morphological properties are offering challenging new insights. With regard to dynamic mechanical analysis (DMA), PLA does not have the classical behavior of a thermoplastic polymer. Often, overlapping events (enthalpic relaxation, glass transition and crystallization) that occur as the temperature increases make the DMA result of a PLA look inexplicable even for polymer scientists. This review offers a perspective of the main phenomena that can be revealed in a DMA experiment and systematizes the information that can be obtained for every region (glassy, glass transition, rubbery, cold-crystallization and melting). Also, some unusual patterns registered in some cases will be commented upon. The review intends to offer indices that one should pay attention to in the interpretation of a DMA experiment, even if the investigator has only basic skills with DMA investigations.

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Section: Poly(lactic Acid) (Pla)—general Outlookmentioning

confidence: 99%

Dynamic Mechanical Analysis Investigations of PLA-Based Renewable Materials: How Are They Useful?

Cristea¹,

Ionita²,

Iftime³

2020

Materials

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“…A simple alternative approach would be blending PCL with other polymers with low crystallinity to tune the crystallinity of the polymer network. Chen et al [ 24 ] blended PCL with poly(L-lactide), and the resultant polymer blends showed crystallinity-dependent mechanical properties as well. We have reported a polymer blending approach of tuning the crystallinity using a polymer blend of tetra-branched and linear PCL [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Influences of Crystallinity and Crosslinking Density on the Shape Recovery Force in Poly(ε-Caprolactone)-Based Shape-Memory Polymer Blends

2022

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Shape-memory polymers (SMPs) show great potential in various emerging applications, such as artificial muscles, soft actuators, and biomedical devices, owing to their unique shape recovery-induced contraction force. However, the factors influencing this force remain unclear. Herein, we designed a simple polymer blending system using a series of tetra-branched poly(ε-caprolactone)-based SMPs with long and short branch-chain lengths that demonstrate decreased crystallinity and increased crosslinking density gradients. The resultant polymer blends possessed mechanical properties manipulable across a wide range in accordance with the crystallinity gradient, such as stretchability (50.5–1419.5%) and toughness (0.62–130.4 MJ m−3), while maintaining excellent shape-memory properties. The experimental results show that crosslinking density affected the shape recovery force, which correlates to the SMPs’ energy storage capacity. Such a polymer blending system could provide new insights on how crystallinity and crosslinking density affect macroscopic thermal and mechanical properties as well as the shape recovery force of SMP networks, improving design capability for future applications.

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“…The average shrinkage ratios were 34.3, 38.0, 27.1, and 15.4% for BPHS0, BPHS10, BPHS20, and BPHS30, respectively. This is due to the rearrangement of the crystalline region during the annealing process [21][22][23] . BPHS0 possessed higher crystallinity and shrunk after the annealing process, similar to the highly cross-linked PCL scaffolds from a previous study 24 .…”

Section: Annealing Effects On Hybrid Scaffoldsmentioning

confidence: 99%

Tough and biodegradable polyurethane-silica hybrids with rapid sol-gel transition for bone repair

Chung

Park

Im³

et al. 2022

Preprint

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Inorganic–organic hybrid materials have promising properties for bone repair because of their covalent bonding between the inorganic and organic phases. This fine interaction allows us to overcome the limitations of composite materials, such as inhomogeneous biodegradation rates and non-biointeractive surfaces. In this study, a polycaprolactone (PCL)-based polyurethane (PU) with an organosilane functional group was synthesized for the first time. Thereafter, a biodegradable PU-silica hybrid was produced through a sol-gel process. The PU-silica hybrid was not only tough and flexible but also fully biodegradable. In addition to this, the urethane bonding enabled the silane coupling agent to increase crosslinking between the polymer and silica network, as well as between polymer to polymer. Accordingly, a rapid sol-to-gel gelation time was required to produce the hybrids, which allowed the production of 3D porous hybrid scaffolds through a simple salt-leaching process. A hybrid scaffold with 30 wt. % silica composition was the most ideal material for a bone regenerative scaffold since it was able to withstand thermal deformation with promising mechanical properties. Moreover, the hybrid scaffold induced osteogenic differentiation and angiogenesis, to accelerate bone regeneration.

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Effect of thermal annealing on crystal structure and properties of PLLA/PCL blend

Cited by 25 publications

References 49 publications

Dynamic Mechanical Analysis Investigations of PLA-Based Renewable Materials: How Are They Useful?

Dynamic Mechanical Analysis Investigations of PLA-Based Renewable Materials: How Are They Useful?

Influences of Crystallinity and Crosslinking Density on the Shape Recovery Force in Poly(ε-Caprolactone)-Based Shape-Memory Polymer Blends

Tough and biodegradable polyurethane-silica hybrids with rapid sol-gel transition for bone repair

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