Control of thermal degradation of poly(lactic acid) using functional polysilsesquioxane microspheres as chain extenders

Han, Ting; Xin, Zhong; Shi, Yaoqi; Zhao, Shicheng; Meng, Xin; Xu, Hui; Zhou, Shuai

doi:10.1002/app.41977

Cited by 11 publications

(10 citation statements)

References 54 publications

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“…Liu et al [16], Corre et al [22], Mihai et al [23] and Pilla et al [24], employed a multi-functional epoxy-based chain extender (Cesa-Extend from Clariant) to give rise to branched structures of PLA. Recently, Han et al [25] used polysilsesquioxane microspheres as novel chain extenders to improve the thermal stability of PLA. PLA has also been blended with different plasticizers, additives and/or polymers to improve desired properties [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

The effect of two commercial melt strength enhancer additives on the thermal, rheological and morphological properties of polylactide

Hernández-Alamilla

Valadez-González

2015

Journal of Polymer Engineering

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Abstract The effect of two commercial melt strength enhancer additives, Paraloid BPMS-250 (BPMS) and Biostrength 700 (BIOS), on the thermal, rheological and morphological properties of polylactide (PLA) was studied. Thermal analyses showed that both the BPMS and BIOS additives decreased the ability of PLA to crystallize. The rheological tests indicated that zero-shear viscosity and storage modulus of the PLA/BPMS and PLA/BIOS blends were significantly increased with the additive content. These could be attributed to the entanglements between the PLA chains with those of the high molecular weight additive, creating a physical network which reduces the segmental mobility of PLA and improves the melt elasticity of the blend. The entanglement molecular weights (Me) of PLA/BPMS and PLA/BIOS blends were lower than those of unprocessed and processed PLA (Me≈4×104 g/mol), which suggests greater chain entanglements and a higher entanglement density (ve). The elongational viscosity (ηE) and melt strength values were estimated using a screw-extrusion capillary rheometer, where the PLA/BIOS blends presented the highest values. Finally, scanning electron microscopy on the samples was carried out to assess the blend morphology.

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Section: Introductionmentioning

confidence: 99%

The effect of two commercial melt strength enhancer additives on the thermal, rheological and morphological properties of polylactide

Hernández-Alamilla

Valadez-González

2015

Journal of Polymer Engineering

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“…Figure 2 presents 29 SiNMR spectra of PSQ and P 5 PSQ, providing further evidence for the reaction of phosphate with PSQ. According to the research of Han [31], the 29 SiNMR of the poly(amino-epoxy)silsesquioxane has one main peak and a weak shoulder peak. The main peak indicates that the PSQ has a fully condensed and regular T3 structure, and the weak shoulder shows that there are amino groups.…”

Section: Resultsmentioning

confidence: 99%

Flame Retardancy and Mechanism of Novel Phosphorus-Silicon Flame Retardant Based on Polysilsesquioxane

et al. 2019

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A novel phosphorus-silicon flame retardant (P5PSQ) was prepared by bonding phosphate to silicon-based polysilsesquioxane (PSQ) and used as flame retardant of poly (lactic acid) (PLA). The results show that PLA with 10 wt % P5PSQ has a limiting oxygen index (LOI) 24.1%, the peak heat release rate (PHRR) and total heat release (THR) of PLA decrease 21.8% and 25.2% compared to neat PLA in cone calorimetric test, indicating that P5PSQ shows better flame retardancy in comparison to PSQ. Furthermore, the study for the morphology and composition of carbon residue after the combustion of PLA and the gas release of PLA during combustion illustrate that P5PSQ has flame retardancy in condensed phase and gas phase simultaneously. In condensed phase, phosphorus from phosphate promotes the formation of more stable and better carbon layer containing Si and P, which inhibits the transfer of heat and oxygen in the combustion. In gas phase, the phosphate in P5PSQ emits phosphorus-containing compound that can restrain the release of C–O containing products, which may have effective flame retardancy for PLA in gas phase to a certain extent. In one word, P5PSQ is denoted as a good phosphorus-silicon synergistic flame-retardant.

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“…Moreover, PBSA is susceptible to biodegradation in various environments such as in soil, sludge, and others. Due to its short biodegradation time, it can also enhance the biodegradation rate of PLA, which is very slow [5][6][7][8][9][10]. Therefore, a blend of PLA with PBSA can result in improved properties of PLA, though this blend is considered immiscible [5].…”

Section: Introductionmentioning

confidence: 99%

Morphological, thermal, and thermomechanical properties of cellulose nanocrystals reinforced polylactide/poly [(butylene succinate)-co-adipate] blend composite foams

Motloung

Zungu

Ojijo

et al. 2020

Functional Composite Mater

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This study examines the influence of cellulose nanocrystal (CN) particles on the morphological, thermal, and thermo-mechanical properties of polylactide (PLA)/poly [(butylene succinate)-co-adipate] (PBSA) blend foams prepared by casting and particulate leaching method using fructose as porogen particles. The morphological analysis showed an interconnected open-cell structure, with porosity above 80%. The crystallinity of the prepared foams was disrupted by the inclusion of CN particles as observed from XRD analyses, which showed a decrease in PLA crystal peak intensity. With regards to neat blend foam, the onset thermal degradation increased with the addition of CN particles, which also increased the thermal stability at 50% weight loss. Furthermore, CN acted as a reinforcing agent in improving the stiffness of the prepared blend foam. Overall, completely environmentally friendly foams were successfully prepared, as a potential material that can replace the current existing foam materials that pose many environmental concerns. However, there is a need to develop an environmentally friendly processing technique.

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Control of thermal degradation of poly(lactic acid) using functional polysilsesquioxane microspheres as chain extenders

Cited by 11 publications

References 54 publications

The effect of two commercial melt strength enhancer additives on the thermal, rheological and morphological properties of polylactide

The effect of two commercial melt strength enhancer additives on the thermal, rheological and morphological properties of polylactide

Flame Retardancy and Mechanism of Novel Phosphorus-Silicon Flame Retardant Based on Polysilsesquioxane

Morphological, thermal, and thermomechanical properties of cellulose nanocrystals reinforced polylactide/poly [(butylene succinate)-co-adipate] blend composite foams

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