Constructing Bone-Mimicking High-Performance Structured Poly(lactic acid) by an Elongational Flow Field and Facile Annealing Process

2020 ◽  
Vol 12 (11) ◽  
pp. 13411-13420 ◽  
Author(s):  
Yue He ◽  
Wen-Hua Xu ◽  
He Zhang ◽  
Jin-Ping Qu
Keyword(s):  
Lactic Acid ◽  
Flow Field ◽  
High Performance ◽  
Elongational Flow ◽  
Annealing Process ◽  
Poly Lactic Acid

Mechanical properties of wood flour/poly (lactic acid) composites coupled with waterborne silane-polyacrylate copolymer emulsion

Holzforschung ◽  
2016 ◽  
Vol 70 (5) ◽  
pp. 439-447 ◽  
Author(s):  
Ru Liu ◽  
Shupin Luo ◽  
Jinzhen Cao ◽  
Yu Chen
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
High Performance ◽  
Coupling Effect ◽  
Wood Flour ◽  
Flexural Modulus ◽  
Coupling Agents ◽  
Poly Lactic Acid ◽  
Effective Coupling ◽  
Methacryloxypropyl Trimethoxysilane

Abstract Wood flour/polylactic acid (WF/PLA) composites were produced with a WF content of 50% based on three types of waterborne polyacrylate (PA) emulsions including a PA homopolymer emulsion and two types of silane-PA copolymer emulsions as coupling agents. Two silanes were in focus, namely, γ-methacryloxypropyl- trimethoxysilane (silane-1) and vinyltrimethoxysilane (silane-2). The emulsions and the modified WFs were characterized, and the effects were investigated in terms of emulsion type and their loading levels on the mechanical properties of WF/PLA composites. (1) Both types of silanes could be successfully copolymerized with PA to form stable emulsions. (2) With increasing PA loading, the mechanical properties (except for flexural modulus) of the composites increased at first before reaching the maximum values at 4% PA loading and then the properties worsened. However, these values were larger than those of pure composites, especially in cases when PA-silane emulsions were applied. (3) PA modified with silane-1 showed the best coupling effect among all the three PA emulsions. The results can be interpreted that PA emulsions are effective coupling agents for the preparation of high-performance WPCs.

scholarly journals Preparation of highly porous interconnected poly(lactic acid) scaffolds based on a novel dynamic elongational flow procedure

2016 ◽  
Vol 101 ◽  
pp. 285-293 ◽  
Author(s):  
Xiang-Fang Peng ◽  
Hao-Yang Mi ◽  
Xin Jing ◽  
Peng Yu ◽  
Jin-Ping Qu ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Elongational Flow ◽  
Poly Lactic Acid ◽  
Highly Porous

Preparation and characterization of composites based on poly(lactic acid)/poly(methyl methacrylate) matrix and sisal fiber bundles: The effect of annealing process

2020 ◽  
pp. 089270572093078
Author(s):  
Ander Orue ◽  
Jon Anakabe ◽  
Ane Miren Zaldua-Huici ◽  
Arantxa Eceiza ◽  
Aitor Arbelaiz
Keyword(s):  
Lactic Acid ◽  
Methyl Methacrylate ◽  
Polymer System ◽  
Annealing Process ◽  
Sisal Fiber ◽  
Maximum Temperature ◽  
Poly Lactic Acid ◽  
Poly Methyl Methacrylate ◽  
Sisal Fibers

The interest on poly(lactic acid) (PLA)/poly(methyl methacrylate) (PMMA) blends has increased during the last years due to their promising properties. The novelty of the current work focuses on the preparation and characterization of biocomposites based on PLA/PMMA matrix and NaOH-treated sisal fibers. The effect of the addition of treated sisal fibers on the physico-mechanical properties of high polylactide content composites was studied. For this purpose, PLA/PMMA blend (80/20 wt%) was prepared by melt-blending and reinforced with different fiber contents. Although composites showed interesting specific tensile properties, the estimated heat deflection temperature (HDT), that is, the maximum temperature at which a polymer system can be used as a rigid material, barely increased 4°C respect to unreinforced system. After the annealing process, the HDT of the unreinforced polymer blend increased around 25°C, whereas the composites showed an increase of at least 38°C. Nonetheless, the specific tensile strength of composite decreased approximately 48% because the adhesion between fiber and polymer matrix was damaged and cracks were formed during annealing process.

Bio-based green composites with high performance from poly(lactic acid) and surface-modified microcrystalline cellulose

2012 ◽  
Vol 22 (31) ◽  
pp. 15732 ◽  
Author(s):  
Lin Xiao ◽  
Yiyong Mai ◽  
Feng He ◽  
Longjiang Yu ◽  
Limin Zhang ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Microcrystalline Cellulose ◽  
High Performance ◽  
Poly Lactic Acid ◽  
Green Composites ◽  
Surface Modified

scholarly journals Functional Nanocomposite Films of Poly(Lactic Acid) with Well-Dispersed Chitin Nanocrystals Achieved Using a Dispersing Agent and Liquid-Assisted Extrusion Process

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4557
Author(s):  
Mitul Patel ◽  
Daniel Schwendemann ◽  
Giorgia Spigno ◽  
Shiyu Geng ◽  
Linn Berglund ◽  
...  
Keyword(s):  
Lactic Acid ◽  
High Performance ◽  
Functional Materials ◽  
Microscopy Study ◽  
Extrusion Process ◽  
Nanocomposite Films ◽  
Poly Lactic Acid ◽  
Dispersing Agent ◽  
Triethyl Citrate ◽  
Performance Functional

The development of bio-based nanocomposites is of high scientific and industrial interest, since they offer excellent advantages in creating functional materials. However, dispersion and distribution of the nanomaterials inside the polymer matrix is a key challenge to achieve high-performance functional nanocomposites. In this context, for better dispersion, biobased triethyl citrate (TEC) as a dispersing agent in a liquid-assisted extrusion process was used to prepare the nanocomposites of poly (lactic acid) (PLA) and chitin nanocrystals (ChNCs). The aim was to identify the effect of the TEC content on the dispersion of ChNCs in the PLA matrix and the manufacturing of a functional nanocomposite. The nanocomposite film’s optical properties; microstructure; migration of the additive and nanocomposites’ thermal, mechanical and rheological properties, all influenced by the ChNC dispersion, were studied. The microscopy study confirmed that the dispersion of the ChNCs was improved with the increasing TEC content, and the best dispersion was found in the nanocomposite prepared with 15 wt% TEC. Additionally, the nanocomposite with the highest TEC content (15 wt%) resembled the mechanical properties of commonly used polymers like polyethylene and polypropylene. The addition of ChNCs in PLA-TEC15 enhanced the melt viscosity, as well as melt strength, of the polymer and demonstrated antibacterial activity.

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