The application of DSC in identification of LDPE/LLDPE blends mulching film

Wu, Xiaobing; Chen, Jiaqi; Zeng, Xianlin

doi:10.1002/apmc.1991.051890117

Cited by 7 publications

(5 citation statements)

References 2 publications

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“…This could be due to PCL and CS‐g‐PCL differing in their ability to crystallize and resulting crystal size. PCL as a linear polymer chain should be able to crystallize easily at higher temperatures and form crystallites with a high lamellae thickness in contrast to the branched and relatively poor ordered CS‐g‐PCL; this probably resulted in the observed double melting peaks on DSC thermograms . The second lowered melting peak can be explained, even without any effects of reorganizational or matrix effects, with the increase of components hardly crystallizing in the actual blend, which result in a lower overall intermolecular interaction …”

Section: Resultsmentioning

confidence: 99%

Blending chitosan‐g‐poly(caprolactone) with poly(caprolactone) by electrospinning to produce functional fiber mats for tissue engineering applications

Cassan

Becker

Glasmacher

et al. 2019

J of Applied Polymer Sci

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Use of electrospun fiber mats for tissue engineering applications has become increasingly prominent. One of the most important polymers in research, poly(ε-caprolactone) (PCL), however, lacks biological performance, easy access to modifications and cellular recognition sites. To improve these properties and to enable further modifications, PCL was blended with chitosan grafted with PCL (CS-g-PCL) and subsequently processed via electrospinning. In this way, chitosan was enriched at the fiber's surface presenting cationic amino groups. The fiber mats were analyzed by various techniques such as scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM), and X-ray photoelectron spectroscopy (XPS). Furthermore, analyzing thermal properties and crystallinity, showed that an increased content of CS-g-PCL in blend composition leads to a higher overall crystallinity in produced fiber mats. Blending CS-g-PCL into PCL significantly increased initial cellular attachment and proliferation as well as cell vitality, while maintaining adequate mechanical properties, fiber diameter, and interstitial volume. As proof of principle for easy access to further modification, fluorescently labeled alginate (Alg-FA) was attached to the fiber's surface and verified by CLSM. Hence, blending CS-g-PCL with PCL can overcome an inherent weakness of PCL and create bioactive implants for tissue engineering applications.

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Section: Resultsmentioning

confidence: 99%

Blending chitosan‐g‐poly(caprolactone) with poly(caprolactone) by electrospinning to produce functional fiber mats for tissue engineering applications

Cassan

Becker

Glasmacher

et al. 2019

J of Applied Polymer Sci

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“…The exothermic peaks (labelled as Tc1, Tc2, and Tc3 in Figure 2b) describe crystallization events. In this case, the correspondence with polymer species is less clear, but the lower temperature events, i.e., Tc2 and Tc3, can be ascribed to LDPE [18], which is characterized by a broad melting range and low peak shape as a result of long branches and wider molecular weight distribution [20]. The sharper peak Tc1 represents the crystallization of HDPE overlapped with that of the PP impurity, whose crystallization occurs in the temperature range ~110-115 °C [18,19,21,22].…”

Section: Thermal Characterization Of Compositesmentioning

confidence: 94%

Effect of Basalt Fibres on Thermal and Mechanical Properties of Recycled Multi-Material Packaging

et al. 2022

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The low-density polyethylene (LDPE)/aluminium mix obtained after the recovery of cellulose from multilayer aseptic packaging used in the food and beverage industry is generally destined for energy recovery. In this work we propose it as a matrix for value-added composite materials. A commercially available material (EcoAllene) obtained from multilayer packaging recycling was reinforced with short natural basalt fibres up to 30 wt.% by twin screw extrusion, aiming at improving the mechanical profile of such material and widening its applications. Thermal characterizations by thermogravimetric analysis and differential scanning calorimetry showed that the material is indeed a complex mixture of LDPE, HDPE, PP, and aluminium. Basalt fibres did not modify the melting and crystallization profile as well as the global degradation behaviour. Composites were then subjected to tensile, bending, Charpy impact tests and the fracture surfaces were investigated by scanning electron microscopy. Results highlighted a beneficial effect of basalt fibres to stiffness and strength in both loading conditions, with improvements by 107% and 162% for tensile and bending strength, respectively, which were linked also to a 45% enhancement of impact strength. This increased mechanical performance is promising for their use in automotive interiors and outdoor decking applications.

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“…Three peaks can be recognized also in the cooling curves ( Figure 2 b). While those labelled as T c2 and T c3 are due to the crystallization of LDPE with its characteristic broad melting range and low peak shape related to long branches and wide molecular weight distribution [ 29 , 31 ], T c1 is instead likely due to HDPE with the crystallization of PP overlapped, which occurs in the range 110–115 °C [ 32 , 33 ]. Flax fibres did not significantly affect the crystallization and melting temperatures, though these temperatures were higher compared to those found in basalt-EcoAllene composites, suggesting an easier crystallization and a more stable crystalline morphology, respectively.…”

Section: Resultsmentioning

confidence: 99%

Recycled Multi-Material Packaging Reinforced with Flax Fibres: Thermal and Mechanical Behaviour

et al. 2022

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In this work, the use of a recycled mix stemming from the treatment of multilayer aseptic packaging used in the food and beverage industry is proposed as the matrix for short fibre composites reinforced with flax fibres, to generate value-added materials in contrast to the more common end-of-life scenario including energy recovery. This is expected to be a preferred choice in the waste hierarchy at the European level. A commercially available material (EcoAllene) obtained from multilayer packaging recycling was compounded with short flax fibres up to 30 wt.% by twin screw extrusion, with a view to enhancing its poor mechanical profile and broadening its applications. Composites were in depth analyzed by thermogravimetric analysis and differential scanning calorimetry, which highlighted the complex nature of this recycled product, a limited nucleation ability of flax fibres and a lower thermal stability due to the premature degradation of natural hemicellulose and cellulose, though featuring in any case onset degradation temperatures higher than 300 °C. Composites’ mechanical properties were assessed in tension, bending and impact conditions, with remarkable improvements over the neat matrix in terms of stiffness and strength. In particular, at 30 wt.% fibre content and with 5 wt.% of maleated coupling agent, an increase in tensile and flexural strength values by 92% and 138% was achieved, respectively, without compromising the impact strength. The effectiveness of flax fibres confirmed by dynamo-mechanical analysis is beneficial to the exploitation of these composites in automotive interiors and outdoor decking applications.

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The application of DSC in identification of LDPE/LLDPE blends mulching film

Cited by 7 publications

References 2 publications

Blending chitosan‐g‐poly(caprolactone) with poly(caprolactone) by electrospinning to produce functional fiber mats for tissue engineering applications

Blending chitosan‐g‐poly(caprolactone) with poly(caprolactone) by electrospinning to produce functional fiber mats for tissue engineering applications

Effect of Basalt Fibres on Thermal and Mechanical Properties of Recycled Multi-Material Packaging

Recycled Multi-Material Packaging Reinforced with Flax Fibres: Thermal and Mechanical Behaviour

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