Deformation of matrix macromolecules in a uniaxially extended styrene-isoprene-styrene linear triblock copolymer

Abstract A linear triblock copolymer, poly(styrene-b-etylene/butylene-b-styrene)(SEBS) thermoplastic elastomer (TPE) grafted with maleic anhydride was used for compatibilization of PP/PBT blends. PP/PBT blends of different mass ratios 60/40, 50/50, 40/60 were mixed with 2.5, 5.0 and 7.5 wt.% of SEBS copolymer in a twin screw extruder. Differential scanning calorimetry and dynamic mechanical analysis were performed to define the phase structure of PP/PBT blends. TPE with a rubbery mid-block shifted the glass transition of PP/PBT blend towards lower temperatures, and significant decrease the crystallization temperature of a crystalline phase of PP component was observed. The influence of the amount of compatibilizer and the blend composition on the mechanical properties (tensile and flexural strengths, toughness and moduli) was determined. Addition of 5 wt.% of a triblock TPE led to a three-fold increase of PP/PBT toughness. A significant increase of impact properties was observed for all materials compatibilized with the highest amount of SEBS copolymer.

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Synthesis and Characterization of Amphiphilic Multiwalled Carbon Nanotubes Based on Linear Triblock Copolymer

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.915-916.732 ◽

2014 ◽

Vol 915-916 ◽

pp. 732-741

Author(s):

Bo Lin

Keyword(s):

Carbon Nanotubes ◽

Multiwalled Carbon Nanotubes ◽

Triblock Copolymer ◽

Synthesis And Characterization ◽

Cleavage Reaction ◽

Multiwalled Carbon ◽

Characteristic Group ◽

Linear Triblock Copolymer ◽

Good Agreement

Amphiphilic multiwalled carbon nanotubes PMAA-g-MWCNT-g-PSt were prepared by grafting linear triblock copolymer PtBMA100-b-PGMA19-b-PSt101 onto the carboxyl multiwalled carbon nanotubes surface with an oxirane cleavage reaction. The ratio of intensity between D band and G band and the shifting of these bands in Raman spectroscopy showed good agreement with fourier transform infrared spectroscopy especially the appearance of the characteristic group of benzene ring at 673 cm-1 for PMAA-g-MWCNT-g-PSt. Thermogravimetric analysis showed that the contents of polymer grafted on the surface of carboxyl multiwalled carbon nanotubes were 36 % and 55 % for PMAA-g-MWCNT-g-PSt and PtBMA-g-MWCNTs-g-PDMAEMA, respectively. The introduction of the cinnamic group into PtBMA100-b-PGMA19-b-PSt101 induced the activation energy of PMAA-g-MWCNT-g-PSt much higher than that of PtBMA-g-MWCNTs-g-PDMAEMA after 238 oC during their thermal decompositions.

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Modification of linear triblock copolymer SBS via olefinic per(poly)fluoroalkylation by per(poly)fluorodiacyl peroxides

Journal of Fluorine Chemistry ◽

10.1016/s0022-1139(00)00253-0 ◽

2000 ◽

Vol 104 (2) ◽

pp. 285-290 ◽

Cited By ~ 7

Author(s):

Zhi-bin Zhou ◽

Hai-ying He ◽

Zhong-yuan Weng ◽

Cheng-xue Zhao

Keyword(s):

Triblock Copolymer ◽

Linear Triblock Copolymer

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Water-soluble dendritic-linear triblock copolymer-modified magnetic nanoparticles: preparation, characterization and drug release properties

Journal of Materials Chemistry ◽

10.1039/c1jm11613d ◽

2011 ◽

Vol 21 (35) ◽

pp. 13611 ◽

Cited By ~ 45

Author(s):

Xiaomeng Wu ◽

Xiaohua He ◽

Liang Zhong ◽

Shaoliang Lin ◽

Dali Wang ◽

...

Keyword(s):

Magnetic Nanoparticles ◽

Drug Release ◽

Triblock Copolymer ◽

Water Soluble ◽

Modified Magnetic Nanoparticles ◽

Linear Triblock Copolymer

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Nanofiller Dispersion, Morphology, Mechanical Behavior, and Electrical Properties of Nanostructured Styrene-Butadiene-Based Triblock Copolymer/CNT Composites

Polymers ◽

10.3390/polym11111831 ◽

2019 ◽

Vol 11 (11) ◽

pp. 1831 ◽

Cited By ~ 4

Author(s):

Ulrike Staudinger ◽

Bhabani K. Satapathy ◽

Dieter Jehnichen

Keyword(s):

Triblock Copolymer ◽

Functional Materials ◽

Volume Resistivity ◽

Processing Parameters ◽

Melt Mixing ◽

Multiwalled Carbon ◽

Soft Phase ◽

Strain Behavior ◽

Melt Compounding ◽

Linear Triblock Copolymer

A nanostructured linear triblock copolymer based on styrene and butadiene with lamellar morphology is filled with multiwalled carbon nanotubes (MWCNTs) of up to 1 wt% by melt compounding. This study deals with the dispersability of the MWCNTs within the nanostructured matrix and its consequent impact on block copolymer (BCP) morphology, deformation behavior, and the electrical conductivity of composites. By adjusting the processing parameters during melt mixing, the dispersion of the MWCNTs within the BCP matrix are optimized. In this study, the morphology and glass transition temperatures (Tg) of the hard and soft phase are not significantly influenced by the incorporation of MWCNTs. However, processing-induced orientation effects of the BCP structure are reduced by the addition of MWCNT accompanied by a decrease in lamella size. The stress-strain behavior of the triblock copolymer/MWCNT composites indicate higher Young’s modulus and pronounced yield point while retaining high ductility (strain at break ~ 400%). At a MWCNT content of 1 wt%, the nanocomposites are electrically conductive, exhibiting a volume resistivity below 3 × 103 Ω·cm. Accordingly, the study offers approaches for the development of mechanically flexible functional materials while maintaining a remarkable structural property profile.

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Morphological transformations in solution-cast Styrene-Butadiene-Styrene (SBS) triblock copolymer thin films

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010013729x ◽

1995 ◽

Vol 53 ◽

pp. 184-185

Author(s):

Ginam Kim ◽

W. Marsillo ◽

M. Libera

Keyword(s):

Thin Films ◽

Triblock Copolymer ◽

Annealing Treatment ◽

Minor Component ◽

Solvent Evaporation ◽

Single Crystal Substrate ◽

Transparent Films ◽

Crystal Substrate ◽

Solution Cast ◽

Morphological Transformations

The fact that block copolymers can assume a range of morphologies depending upon such variables as relative block length and molecular weight is now well known. In the case of poly(styrene)[PS]-poly(butadiene)[PB]-poly(styrene) (SBS) triblock copolymer, the morphologies range from spheres (roughly ~20% minor component), to cylinders (roughly 20%~35% minor component), to lamellae (roughly equal component fractions) Most recently, there has been increasing interest in transformations between morphologies by thermal annealing. This paper describes initial results studying the effect of solvent evaporation rate and post-casting annealing treatment on the morphology of SBS thin films.TEM specimens were prepared by solution casting electron transparent films. 50 μl of 0.1 wt% SBS (30% styrene, Mw=14,000, Scientific Polymer Products, Inc.) dissolved in toluene was deposited on a polished NaCl single crystal substrate placed in a small dish. After solvent evaporation the film was cut into small squares, floated from the salt in water, and each square was collected on a Cu grid.

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Size Control of Block Polymer Templated Mesoporous Silicate Materials

MRS Proceedings ◽

10.1557/proc-628-cc6.24 ◽

2000 ◽

Vol 628 ◽

Author(s):

Takeo Yamada ◽

Keisuke Asai ◽

Kenkichi Ishigure ◽

Akira Endo ◽

Hao S. Zhou ◽

...

Keyword(s):

Mesoporous Materials ◽

Molecular Sieve ◽

Mesoporous Material ◽

Triblock Copolymer ◽

Size Control ◽

Block Polymer ◽

New Class ◽

Mesoporous Silicate ◽

Cubic Structure ◽

Silicate Materials

ABSTRACTMesoporous materials have attracted considerable interest because of applications in molecular sieve, catalyst, and adsorbent. It will be useful for new functional device if functional molecules can be incorporated into the pore of mesoporous material. However, it is necessary to synthesize new mesoporous materials with controlled large pore size. Recently, new class of mesoporous materials has been prepared using triblock copolymer as a template. In this paper, we reported that hexagonal and cubic structure silicate mesoporous materials can be synthesized through triblock copolymer templating, and their size was controlled by synthesis condition at condensation.

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