Antibacterial and thermomechanical properties of composites of polylactic acid modified with capsicum oleoresin‐impregnated nanoporous silica

2019 ◽  
Vol 136 (31) ◽  
pp. 47825 ◽  
Author(s):  
Laongdaw Techawinyutham ◽  
Suchart Siengchin ◽  
Jyotishkumar Parameswaranpillai ◽  
Rapeephun Dangtungee
Keyword(s):  
Polylactic Acid ◽  
Thermomechanical Properties ◽  
Nanoporous Silica ◽  
Properties Of Composites

scholarly journals Mechanical, dynamic, and thermomechanical properties of coir/pineapple leaf fiber reinforced polylactic acid hybrid biocomposites

2018 ◽  
Vol 40 (5) ◽  
pp. 2000-2011 ◽  
Author(s):  
Ramengmawii Siakeng ◽  
Mohammad Jawaid ◽  
Hidayah Ariffin ◽  
S. M. Sapuan
Keyword(s):  
Polylactic Acid ◽  
Thermomechanical Properties ◽  
Fiber Reinforced ◽  
Pineapple Leaf Fiber ◽  
Leaf Fiber

scholarly journals Melt strengthening of polylactic acid and its blends: Shear and elongation rheological investigations of the forming process

2021 ◽  
Author(s):  
Abderrahim Maazouz ◽  
Khalid Lamnawar
Keyword(s):  
Polylactic Acid ◽  
Blow Up ◽  
Good Alternative ◽  
Thermomechanical Properties ◽  
Chain Extension ◽  
Nucleating Agents ◽  
Forming Process ◽  
Exclusion Chromatography ◽  
Stability Maps ◽  
The Stability

Polylactic acid (PLA) can be a good alternative to petroleum-based polymers thanks to its organic origin and its biodegradability. This study introduces some promising routes for enhancing the processability of PLA, which presents several challenges due mainly to the poor shear and elongation properties of this biopolymer. To our knowledge, this is the first paper dedicated to an investigation of foaming and/or blown extrusion of PLA that focuses on structural, rheological and thermomechanical properties. Two main routes were selected: (i) the modification of its structural, rheological and thermomechanical properties and (ii) blending the PLA with another ductile, thermoplastic biopolymer such as poly (butylene adipate-co-terephthalate) (PBAT) or polyamide (PA11). Various formulations of PLA with multifunctionalized epoxy, nucleating agents and plasticizer were prepared and characterized on the basis of their linear viscoelasticity and extensional properties. The balance of chain extension and branching was also investigated using solution viscosimetry, steric exclusion chromatography (SEC) and rheology (shear and elongation rheology). On one hand, a batch foaming process assisted by supercritical CO2 was carried out. The influence of the foaming parameters, the extent of chain modification and the contribution of crystallization to cell morphology were all evaluated. Based on these parameters, structures ranging from micro to macro-cellular-cell were obtained. On the other hand, the stability maps of blown extrusion for neat and modified PLA were established at different die temperatures. We succeeded in greatly enhancing the blown extrusion windows of PLA, achieving high blow-up ratio (BUR) and take-up ratio (TUR) values. We were able to demonstrate that faster kinetics of crystallization can also be reached for chain-extended and branched PLA formulated with adequate amounts of nucleating agents and plasticizers. Through this work, blown films with intriguing thermomechanical and mechanical properties were produced using an optimal formulation for PLA. 

Actuation of Shape Memory Polymer by Resistive Heating of Carbon Nanopaper

2009 ◽  
Author(s):  
Haibao Lu ◽  
Yong Tang ◽  
Jihua Gou ◽  
Erin Chow ◽  
Jinsong Leng ◽  
...  
Keyword(s):  
Shape Memory ◽  
Shape Recovery ◽  
Carbon Nanofiber ◽  
Volume Fraction ◽  
Shape Memory Polymer ◽  
Mechanical Analysis ◽  
Thermomechanical Properties ◽  
Paper Sheet ◽  
Scanning Electron ◽  
Properties Of Composites

To electrically activate the shape recovery in a styrene-based shape-memory polymer (SMP) by coating with conductive carbon nanofiber paper has been demonstrated in this paper. Carbon nanofibers in the form of paper sheet in combination with SMP significantly improve the electrical and thermal conductivity of polymer, leading to the actuation of SMP/nanopaper composite (with 15% volume fraction of carbon nanopaper, dimension of 10.0 cm × 0.5 cm × 0.3 cm) can be carried out by applying 8.4 V voltage, with response time of 140 s. Therefore, electrical conductivity of 6.6 S/cm is obtained. This approach, although demonstrated in styrene-based polymer, is applicable to other type of SMP materials. Furthermore, the morphologies of carbon nanofiber in the form of paper is observed by scanning electron microscopy, and the thermomechanical properties of composites are measured and analyzed by dynamic mechanical analysis.

Effect of coupling agent content on properties of composites made from polylactic acid and chrysanthemum waste

2019 ◽  
Vol 26 (1) ◽  
pp. 10-16 ◽  
Author(s):  
Koay Seong Chun ◽  
Chan Ming Yeng ◽  
Chou Pui May ◽  
Tshai Kim Yeow ◽  
Ong Thai Kiat ◽  
...  
Keyword(s):  
Polylactic Acid ◽  
Coupling Agent ◽  
Properties Of Composites
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