The effects of blending small amounts of homopolystyrene on the mechanical properties of a low styrene content styrene-butadiene-styrene block copolymer

1990 ◽  
Vol 30 (1) ◽  
pp. 49-58 ◽  
Author(s):  
Linda S. Flosenzier ◽  
John H. Rohlfing ◽  
Alodia M. Schwark ◽  
John M. Torkelson
Keyword(s):  
Mechanical Properties ◽  
Block Copolymer ◽  
Styrene Content ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

scholarly journals Influence of Ultraviolet Radiation on Mechanical Properties of a Photoinitiator Compounded High Vinyl Styrene–Butadiene–Styrene Block Copolymer

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1287
Author(s):  
Sanjoy Datta ◽  
Radek Stocek ◽  
Kinsuk Naskar
Keyword(s):  
Mechanical Properties ◽  
Block Copolymer ◽  
Ultraviolet Radiation ◽  
Thermoplastic Elastomer ◽  
Labile Hydrogen ◽  
Hydrogen Atoms ◽  
Time Saving ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

Ultraviolet curing of elastomers is a special curing technique that has gained importance over the conventional chemical crosslinking method, because the former process is faster, and thus, time-saving. Usually, a suitable photoinitiator is required to initiate the process. Ultraviolet radiation of required frequency and intensity excites the photoinitiator which abstracts labile hydrogen atoms from the polymer with the generation of free radicals. These radicals result in crosslinking of elastomers via radical–radical coupling. In the process, some photodegradation may also take place. In the present work, a high vinyl (~50%) styrene–butadiene–styrene (SBS) block copolymer which is a thermoplastic elastomer was used as the base polymer. An attempt was made to see the effect of ultraviolet radiation on the mechanical properties of the block copolymer. The process variables were time of exposure and photoinitiator concentration. Mechanical properties like tensile strength, elongation at break, modulus at different elongations and hardness of the irradiated samples were studied and compared with those of unirradiated ones. In this S-B-S block copolymer, a relatively low exposure time and low photoinitiator concentration were effective in obtaining optimized mechanical properties. Infrared spectroscopy, contact angle and scanning electron microscopy were used to characterize the results obtained from mechanical measurements.

Effect of Casting Solvent on the Mechanical Properties of a Styrene-Butadiene-Styrene Block Copolymer

1972 ◽  
Vol 45 (1) ◽  
pp. 252-267 ◽  
Author(s):  
G. S. Fielding-Russell
Keyword(s):  
Mechanical Properties ◽  
Block Copolymer ◽  
Strain Curve ◽  
Continuous Phase ◽  
Stress Strain ◽  
Cast Sample ◽  
Solvent Cast ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

Abstract The tensile mechanical properties of a number of well characterized solution-cast styrene—butadiene-styrene block copolymer systems are reported within the strain range of 0<ε≤5.0. It was found from the results of repeated stretching experiments (up to 100%) at room temperature that polymers cast from solvents for polystyrene or from solvents for both polystyrene and polybutadiene showed lower stresses on each cycle whereas the stress levels for the polybutadiene solvent-cast sample remained essentially constant. The polystyrene solvent-cast and polystyrene/polybutadiene solvent-cast samples exhibited a yield at ε≈0.3. No “yield” was apparent with the polybutadiene solvent-cast sample. The explanation for these behaviors lies in the material of the continuous phase. When the continuous phase is polystyrene there will be long-time recovery after the yield and consequently the system will be left under residual stress so that lower strains are observed on subsequent straining. When polybutadiene is the continuous phase (a phase inversion) no such yielding is apparent, the form of the stress-strain curve is that of an elastomeric material, and hence the repeated stress-strain curves are practically superposable. It was concluded that the low strain region is governed by the material of the continuous phase. From the viscoelastic measurements it was found that at 1.0≤ε≤6.0 the values of the modulus-temperature dependencies were comparable to that given by polystyrene and that the linearity and the slopes of plots of the logaT as a function of temperature were indicative of a glassy and, moreover, a polystyrene response. It was concluded that the strain region 2.0≤ε≤5.0 is governed by the polystyrene content, whether it be in the continuous phase or not. These results, together with certain proposed model structure, are discussed with the available literature.

TUNING PROPERTIES AND MORPHOLOGY IN HIGH VINYL CONTENT SBS BLOCK COPOLYMER, A THERMOPLASTIC ELASTOMER VIA THIOL-ENE MODIFICATION

2017 ◽  
Vol 90 (3) ◽  
pp. 550-561 ◽  
Author(s):  
Prithwiraj Mandal ◽  
Siva Ponnupandian ◽  
Soumyadip Choudhury ◽  
Nikhil K. Singha
Keyword(s):  
Block Copolymer ◽  
Thermoplastic Elastomer ◽  
Atomic Force Microscopy Analysis ◽  
Ene Reaction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Microscopy Analysis ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

ABSTRACT Thiol-ene modification of high vinyl content thermoplastic elastomeric styrene butadiene styrene (SBS) block copolymer (BCP) was carried out using different thiolating agents in toluene at 70 °C. 1H NMR analysis confirmed the participation of vinyl double bond in the thiol-ene modification reaction of SBS. Surface morphology of the block copolymers evaluated by atomic force microscopy analysis showed higher roughness after the thiol-ene reaction. The thiol-modified SBS block copolymer showed better adhesion strength and oil resistance properties than the pristine SBS.

Thermo‐responsive shape memory properties based on polylactic acid and styrene‐butadiene‐styrene block copolymer

2021 ◽  
pp. 51000
Author(s):  
Fathin Hani Azizul Rahim ◽  
Abdul Aziz Saleh ◽  
Raa Khimi Shuib ◽  
Ku Marsilla Ku Ishak ◽  
Zuratul Ain Abdul Hamid ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Shape Memory ◽  
Polylactic Acid ◽  
Shape Memory Properties ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene
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