Interfacial segregation in two-phase polymer blends with diblock copolymer additives: the effect of homopolymer molecular weight

1992 ◽  
Vol 25 (1) ◽  
pp. 220-225 ◽  
Author(s):  
Kevin H. Dai ◽  
Edward J. Kramer ◽  
Kenneth R. Shull
Keyword(s):  
Molecular Weight ◽  
Polymer Blends ◽  
Diblock Copolymer ◽  
Two Phase ◽  
Interfacial Segregation

Modification of Interfacial Properties of Polymer Blends with Diblock Copolymer

1996 ◽  
Vol 461 ◽  
Author(s):  
S. Kim ◽  
C. C. Han
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Polymer Blends ◽  
Diblock Copolymer ◽  
Diblock Copolymers ◽  
Phase Region ◽  
Domain Growth ◽  
Two Phase ◽  
Phase Separation Kinetics ◽  
Styrene Butadiene

ABSTRACTThe effect of diblock copolymer on the phase-separation process of polymer blends has been investigated by using light scattering and optical microscopic observations. To quench the system into the two phase region, a shear-jump technique is employed instead of the conventional temperature-jump technique. The samples studied are blends of low-molecular-weight polystyrene and polybutadiene with and without added styrene-butadiene block copolymer as a compatibilizer. It was observed that the addition of diblock copolymers could accelerate the phase separation kinetics depending on the shear history. As the concentration of diblock copolymer increases, the distribution of domain sizes becomes narrower and the growth rate slows down. The extent of slowing-down depends on the molecular weight and concentration of the copolymer. The time dependence of domain growth is clearly observed with optical microscopy.

scholarly journals Stabilization of Dispersed Domains in Polymer Blends by Addition of Low Molecular Weight Diblock Copolymer

2001 ◽  
Vol 50 (12Appendix) ◽  
pp. 229-233
Author(s):  
Yoshiaki TAKAHASHI ◽  
Akiko YOSHIDA ◽  
Atsushi TAKANO ◽  
Yushu MATSUSHITA
Keyword(s):  
Molecular Weight ◽  
Polymer Blends ◽  
Diblock Copolymer ◽  
Low Molecular Weight

Synthesis of poly(methyl methacrylate)-b-poly(acrylic acid) by DPE method

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Dong Chen ◽  
Ruixue Liu ◽  
Zhifeng Fu ◽  
Yan Shi
Keyword(s):  
Molecular Weight ◽  
Acrylic Acid ◽  
Methyl Methacrylate ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Gel Permeation Chromatography ◽  
Amphiphilic Diblock Copolymer ◽  
Poly Methyl Methacrylate ◽  
Copolymer Poly ◽  
Poly Acrylic Acid

AbstractAmphiphilic diblock copolymer poly(methyl methacrylate)-b-poly(acrylic acid) (PMMA-b-PAA) was prepared by 1,1-diphenylethene (DPE) method. Firstly, free radical polymerization of methyl methacrylate was carried out with AIBN as initiator in the presence of DPE, giving a DPE-containing PMMA precursor with controlled molecular weight. tert-Butyl acrylate (tBA) was then polymerized in the presence of the PMMA precursor, and PMMA-b-PtBA diblock copolymer with controlled molecular weight was prepared. Finally, amphiphilic diblock copolymer PMMA-b-PAA was obtained by hydrolysis of PMMA-b-PtBA. The formation of PMMA-b-PAA was confirmed by 1H NMR spectrum and gel permeation chromatography. Transmission electron microscopy and dynamic light scattering were used to detect the self-assembly behavior of the amphiphilic diblock polymers in methanol.

Influence of selective filling on rheological properties and phase inversion of two-phase polymer blends

Polymer ◽  
2002 ◽  
Vol 43 (16) ◽  
pp. 4467-4477 ◽  
Author(s):  
Sandra Steinmann ◽  
Wolfram Gronski ◽  
Christian Friedrich
Keyword(s):  
Polymer Blends ◽  
Rheological Properties ◽  
Phase Inversion ◽  
Two Phase

Swelling of lamellar diblock copolymer by homopolymer: influences of homopolymer concentration and molecular weight

1991 ◽  
Vol 24 (23) ◽  
pp. 6182-6188 ◽  
Author(s):  
Karen I. Winey ◽  
Edwin L. Thomas ◽  
Lewis J. Fetters
Keyword(s):  
Molecular Weight ◽  
Diblock Copolymer

Variation of periodic crazing based on polymer blends of an ultra-high and a low molecular weight poly(methyl methacrylate)

2016 ◽  
Vol 134 (1) ◽  
Author(s):  
Keishi Naito ◽  
Akiyoshi Takeno ◽  
Ryota Morifuji ◽  
Toshiaki Miyata ◽  
Minoru Miwa ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Methyl Methacrylate ◽  
Polymer Blends ◽  
Low Molecular Weight ◽  
Poly Methyl Methacrylate

Mechanical Properties of Blends of Crystallizable Polybutadienes Containing Amorphous Polybutadiene Diblock Copolymers

1994 ◽  
Vol 67 (2) ◽  
pp. 342-347
Author(s):  
Moira Marx Nir ◽  
Robert E. Cohen
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Surface Area ◽  
Diblock Copolymer ◽  
Diblock Copolymers ◽  
Tensile Failure ◽  
Interfacial Surface ◽  
Failure Properties ◽  
Enhanced Properties

Abstract Tensile failure properties of syndiotactic 1,2 polybutadiene/trans 1,4 polybutadiene crystalline blends are improved by addition of 5–10% amorphous 1,2 polybutadiene/1,4 polybutadiene diblock copolymer. The effect of block molecular weight and microphase behavior of the diblock copolymer was investigated. Heterogeneous diblocks enhance blend properties to a greater extent than homogeneous diblocks. In blends with enhanced properties, percent coverage of interfacial surface area by diblock is on the order of 10%.

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