scholarly journals Composites of Styrene-butadiene Block-copolymers Reinforced with WEEE Polystyrene Fraction

2019 ◽  
Vol 56 (3) ◽  
pp. 510-513
Author(s):  
Ramona Marina Grigorescu ◽  
Paul Ghioca ◽  
Lorena Iancu ◽  
Madalina Elena Grigore ◽  
Ramona Elena Andrei ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Mechanical Testing ◽  
Mechanical Analysis ◽  
Reinforced Composites ◽  
Plastics Recycling ◽  
Metals Recovery ◽  
Reinforcing Agent ◽  
Shoe Soles ◽  
Styrene Butadiene

The high global production of electric and electronic equipment increases in the same manner the amount of the waste that needs to be recycled. Special attention is given to the plastics recycling from the waste in addition to the metals recovery that brings economic advantages. Considering that the plastic amount contains about 80% polystyrene polymers, the paper presents a recycling study of this fraction as reinforcing agent for a styrene-butadiene block copolymer. In order to reduce the melt viscosity, some of the composites were extended with paraffin-naphthenic �heavy white oil�. The blends were characterized by mechanical testing, thermal and dynamo-mechanical analysis. Based on the resulted properties, it can be concluded that the extended and reinforced composites can be used as material for shoe soles.

scholarly journals Composites of Styrene-Butadiene Block-Copolymer Reinforced with Waste Printed Circuit Boards (WPCB)

2020 ◽  
Vol 57 (1) ◽  
pp. 92-99
Author(s):  
Paul Ghioca ◽  
Ramona Marina Grigorescu ◽  
Lorena Iancu ◽  
Rodica-Mariana Ion ◽  
Madalina-Elena David ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Printed Circuit Boards ◽  
Rapid Development ◽  
Mechanical Analysis ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Waste Printed Circuit Boards ◽  
Metals Recovery ◽  
Shoe Soles ◽  
Styrene Butadiene

In recent years, the rapid development of electronic equipment led to millions of tons of waste printed circuit boards (WPCB) generated in the entire world rising important concerns regarding its recycling. Besides the metals recovery, intensively studied, the reuse of the nonmetals is especially difficult. In this study, the non-metallic fraction from the waste of printed circuit boards is used as reinforcing filler of a styrene-butadiene block-copolymer. The composites were characterized by mechanical and dynamo-mechanical analysis and thermo-gravimetry. The study aimed the reintroduction into the economic circuit of WPCB as composites suitable for the production of shoe soles injected directly on the footwear faces and as bitumen modifiers for road coverings.

The Properties of a Styrene Butadiene Block Copolymer with a High Styrene Content

2014 ◽  
Vol 41 (10) ◽  
pp. 45-50
Author(s):  
A.A. Alekseev ◽  
A.V. Lobanov ◽  
V.S. Osipchik ◽  
V.S. Glukhovskoi ◽  
V.M. Aristov ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Absorption Band ◽  
Ir Spectra ◽  
Structure And Properties ◽  
Styrene Content ◽  
Styrene Butadiene ◽  
Butadiene Styrene

The structure and properties of block copolymers (BCPs) of styrene and butadiene of grade StiroTEP-70 (styrene:butadiene = 70:30, Mw/Mn = 1.43–1.45) are discussed. Analysis of IR spectra enables the BCP to be treated as polystyrene-stat-copoly(butadiene/styrene/1,2-butadiene)-polystyrene. It is suggested that the absorption band at 542 cm-1 be considered as characteristic when identifying polymers with extensive polystyrene phases. At temperatures of 190–230°C, the BCP is partially crosslinked, and at 260°C it breaks down. The BCP is processed well at temperatures up to 200°C.

scholarly journals A Global View on Block Copolymers

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 869
Author(s):  
Massimo Lazzari ◽  
Mercedes Torneiro
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Self Assembly ◽  
The United States ◽  
Poly Lactic Acid ◽  
Self Assembling ◽  
Morphological Aspects ◽  
Delivery Vehicles ◽  
Number Of Publications ◽  
Styrene Butadiene

In this systematic review, a total of 45,143 publications on block copolymers, issued between 1952 and 2019, are analyzed in terms of number, source, language, institution, country, keywords, and block copolymer type, to find out their evolution and predict research trends. The number of publications devoted to block copolymers has been growing for over six decades, maintaining a consistent level throughout the last few years. In their majority, documents came out of the United States, although more recently, Chinese institutions are those displaying the largest production. Keywords analysis indicated that one-third of the publications concerned synthesis, around 20% explored self-assembly and morphological aspects, and another 20% referred to block copolymer applications in solution. In particular, 2019 confirmed the expansion of studies related to drug delivery, and in minor extent, to a deeper view of self-assembling. Styrene–butadiene–styrene block copolymer was the most popular in studies covering both basic and industrially oriented aspects. Other highly investigated copolymers are PEO-b–PPO-b–PEO (Pluronic©) and amphiphilic block copolymers based on polycaprolactone or poly(lactic acid), which owed their success to their potential as delivery vehicles. Future trending topics will concern nanomedicine challenges and technology-related applications, with a special attention toward the orientation and ordering of mesophase-separated morphologies.

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