scholarly journals Applicability of Different Bio-based Polymers for Wiring Boards

2019 ◽  
Vol 63 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Carolin Henning ◽  
Anna Schmid ◽  
Sophia Hecht ◽  
Kathrin Harre ◽  
Reinhard Bauer
Keyword(s):  
Mechanical Properties ◽  
Flame Retardant ◽  
Cellulose Acetate ◽  
Thick Film ◽  
Electrical Performance ◽  
Biobased Materials ◽  
Board Material ◽  
Order Of Magnitude ◽  
Wiring Board ◽  
Performance Surface

The paper gives a review of experiments for the application of biodegradable, sustainable polymers as a wiring board material. In the paper two different biobased materials and the standard PCB materials FR4 and FR2 were compared. The investigations refer to mechanical, electrical performance, surface quality the flammability and applicability for Polymer Thick Film Technology (PTFT) of the biobased material. The biobased materials are polylactic acid (PLA) mixed with different contents of cellulose acetate (CA) or flame retardant zinc pyrophosphate (ZnPP) and polyurethane (PU) with CA. The results show that the addition of CA to the polymers leads to a change of different properties for PLA and to a significant change in mechanical properties for PU. The use of ZnPP in PLA shows major improvements regarding the flammability of the polymer. The properties of the samples are in the same order of magnitude as the properties of FR2.

scholarly journals Effect of a Novel Flame Retardant on the Mechanical, Thermal and Combustion Properties of Poly(Lactic Acid)

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2407
Author(s):  
Mingjun Niu ◽  
Zhongzhou Zhang ◽  
Zizhen Wei ◽  
Wanjie Wang
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Flame Retardant ◽  
Testing Machine ◽  
Poly Lactic Acid ◽  
Limiting Oxygen Index ◽  
Biobased Materials ◽  
Cone Calorimeter Test ◽  
Combustion Properties ◽  
Ul 94

Poly(lactic) acid (PLA) is one of the most promising biobased materials, but its inherent flammability limits its applications. A novel flame retardant hexa-(DOPO-hydroxymethylphenoxy-dihydroxybiphenyl)-cyclotriphosphazene (HABP-DOPO) for PLA was prepared by bonding 9,10-dihydro-9-oxy-10-phosphaphenanthrene-10-oxide (DOPO) to cyclotriphosphazene. The morphologies, mechanical properties, thermal stability and burning behaviors of PLA/HABP-DOPO blends were investigated using a scanning electron microscope (SEM), a universal mechanical testing machine, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), limiting oxygen index (LOI), vertical burning (UL-94) and a cone calorimeter test (CCT). The LOI value reached 28.5% and UL-94 could pass V-0 for the PLA blend containing 25 wt% HABP-DOPO. A significant improvement in fire retardant performance was observed for PLA/HABP-DOPO blends. PLA/HABP-DOPO blends exhibited balanced mechanical properties. The flame retardant mechanism of PLA/HABP-DOPO blends was evaluated.

Enhancing Mechanical Properties of Electrospun Cellulose Acetate Fibers Upon Potassium Chloride Exposure

2020 ◽  
Author(s):  
Ruhit Sinha ◽  
Srinivas Janaswamy ◽  
Anamika Prasad
Keyword(s):  
Mechanical Properties ◽  
Potassium Chloride ◽  
Cellulose Acetate

An efficient method to improve simultaneously the water resistance, flame retardancy and mechanical properties of POE intumescent flame-retardant systems

RSC Advances ◽  
2015 ◽  
Vol 5 (21) ◽  
pp. 16328-16339 ◽  
Author(s):  
Rui-Min Li ◽  
Cong Deng ◽  
Cheng-Liang Deng ◽  
Liang-Ping Dong ◽  
Hong-Wei Di ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flame Retardant ◽  
Flame Retardancy ◽  
Efficient Method ◽  
Water Resistance ◽  
Intumescent Flame Retardant

The water resistance, flame retardancy and mechanical properties of POE intumescent flame-retardant systems were improved simultaneously.

Morphology and mechanical properties of nanocomposites of cellulose acetate and organic montmorillonite prepared with different plasticizers

2011 ◽  
pp. n/a-n/a ◽  
Author(s):  
Juliana Aristéia de Lima ◽  
Caio Augusto Pinotti ◽  
Maria Isabel Felisberti ◽  
Maria do Carmo Gonçalves
Keyword(s):  
Mechanical Properties ◽  
Cellulose Acetate ◽  
Organic Montmorillonite ◽  
Morphology And Mechanical Properties

The Influence of the Addition of Ti on the Mechanical Properties of W-S-Ti Coatings

2006 ◽  
Vol 514-516 ◽  
pp. 687-691 ◽  
Author(s):  
Manuel Evaristo ◽  
Ana Nossa ◽  
Albano Cavaleiro
Keyword(s):  
Mechanical Properties ◽  
Friction Coefficient ◽  
Tribological Performance ◽  
The Self ◽  
Wear Coefficient ◽  
Gradual Loss ◽  
Order Of Magnitude ◽  
Amorphous Structures ◽  
Ti Content ◽  
Ti Films

In this work, W-S-Ti films were deposited by r.f. magnetron sputtering, using simultaneously WS2 and Ti targets. The atomic percentage of Ti in the coating was varied from 0 at.% up to 28 at.%. No significant variations in the S/W ratio with the increase of Ti content were observed. The increasing Ti contents in the films led to a gradual loss of crystallinity. Coatings with contents greater than ≈ 16 at.% only presents a broad peak characteristic of amorphous structures. Alloying the films with Ti led to significant improvements in the hardness (from 0.3 to 8.9 GPa). Also, the adhesive critical load continuously grew with the increase of the Ti content in the films. The wear coefficient of the films dropped more than one order of magnitude with the increase of Ti content whereas the friction coefficient was kept fairly constant with just a small increase in relation to single W-S film. In conclusion, to have a good tribological performance, the addition of Ti to the films should be balanced in order that the increase of the mechanical properties does not lead to severe loss of the self-lubricant properties.

Flame Retardation of Plain Weave Fabrics Made of Polyacrylonitrile Pre-Oxidized Yarns

2011 ◽  
Vol 175-176 ◽  
pp. 465-468 ◽  
Author(s):  
Lei Shi ◽  
Hua Wu Liu ◽  
Ping Xu ◽  
Dang Feng Zhao
Keyword(s):  
Mechanical Properties ◽  
Flame Retardant ◽  
Oxygen Index ◽  
Limiting Oxygen Index ◽  
Plain Weave ◽  
Weave Fabric ◽  
Short Period ◽  
Flame Retardation ◽  
Fabric Structures

Plain weave fabrics of polyacrylonitrile pre-oxidation yarns (PANOF) were prepared by small rapier loom. The flame retardation properties, mechanical properties and wear behaviors of PANOF plain weave fabrics were tested. The limiting oxygen index (LOI) of these PANOF plain weave fabric samples was 31%, which meets the criterion of flame-retardant fabrics. These fabrics neither melt nor shrunk when left in flame for a short period of time and the fabric structures were well maintained. Compared with flammable polyacrylonitrile fabrics, the polyacrylonitrile pre-oxidation fabrics exhibited excellent flame retardation properties, with satisfactory mechanical properties and comfortable handle.

scholarly journals Progress in Biodegradable Flame Retardant Nano-Biocomposites

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 741
Author(s):  
Zorana Kovačević ◽  
Sandra Flinčec Grgac ◽  
Sandra Bischof
Keyword(s):  
Mechanical Properties ◽  
Flame Retardant ◽  
Flame Retardancy ◽  
Circular Economy ◽  
Nanocomposite Materials ◽  
Thermal And Mechanical Properties ◽  
Specific Group ◽  
New Class ◽  
Research Initiatives ◽  
Positive Properties

This paper summarizes the results obtained in the course of the development of a specific group of biocomposites with high functionality of flame retardancy, which are environmentally acceptable at the same time. Conventional biocomposites have to be altered through different modifications, to be able to respond to the stringent standards and environmental requests of the circular economy. The most commonly produced types of biocomposites are those composed of a biodegradable PLA matrix and plant bast fibres. Despite of numerous positive properties of natural fibres, flammability of plant fibres is one of the most pronounced drawbacks for their wider usage in biocomposites production. Most recent novelties regarding the flame retardancy of nanocomposites are presented, with the accent on the agents of nanosize (nanofillers), which have been chosen as they have low or non-toxic environmental impact, but still offer enhanced flame retardant (FR) properties. The importance of a nanofiller’s geometry and shape (e.g., nanodispersion of nanoclay) and increase in polymer viscosity, on flame retardancy has been stressed. Although metal oxydes are considered the most commonly used nanofillers there are numerous other possibilities presented within the paper. Combinations of clay based nanofillers with other nanosized or microsized FR agents can significantly improve the thermal stability and FR properties of nanocomposite materials. Further research is still needed on optimizing the parameters of FR compounds to meet numerous requirements, from the improvement of thermal and mechanical properties to the biodegradability of the composite products. Presented research initiatives provide genuine new opportunities for manufacturers, consumers and society as a whole to create a new class of bionanocomposite materials with added benefits of environmental improvement.

Active cellulose acetate‐oregano essential oil films to conservation of hamburger buns: Antifungal, analysed sensorial and mechanical properties

2021 ◽  
Author(s):  
Flávio Gomes Fernandes ◽  
Cristiani Viegas Brandão Grisi ◽  
Raunira Costa Araújo ◽  
Diego Alvarenga Botrel ◽  
Solange Sousa
Keyword(s):  
Mechanical Properties ◽  
Essential Oil ◽  
Cellulose Acetate ◽  
Oregano Essential Oil ◽  
Oil Films
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