scholarly journals Effects of Molecular Weight and Crystallization Temperature on the Morphology Formation in Asymmetric Diblock Copolymers with a Highly Crystalline Block

2000 ◽  
Vol 32 (7) ◽  
pp. 602-609 ◽  
Author(s):  
Awaludin Rohadi ◽  
Ryuji Endo ◽  
Satoshi Tanimoto ◽  
Shintaro Sasaki ◽  
Shuichi Nojima
Keyword(s):  
Molecular Weight ◽  
Crystallization Temperature ◽  
Diblock Copolymers

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%.

The Ordered Bicontinuous Double Diamond Structure in Binary Blends of Diblock Copolymer and Homopolymer.

1989 ◽  
Vol 171 ◽  
Author(s):  
Karen I. Winey ◽  
Edwin L. Thomas
Keyword(s):  
Molecular Weight ◽  
Diblock Copolymer ◽  
Diblock Copolymers ◽  
Composition Range ◽  
Volume Fraction ◽  
Diamond Structure ◽  
Binary Blends ◽  
Resultant Effect ◽  
Strong Segregation ◽  
Double Diamond

ABSTRACTWe report the observation of the ordered bicontinuous double diamond (OBDD) structure in binary blends of poly(styrene-isoprene) diblock copolymer and homopolystyrene. The overall polystyrene volume fraction range is 64 - 67 PSvol% for the OBDD structure in binary blends of a lamellar diblock (SI 27/22) and a homopolymer (14.0 hPS). This composition range is approximately within the polystyrene volume fraction range established for pure diblock copolymers in the strong segregation regime having the OBDD structure. Ordered lamellae are observed at approximately 65 PSvol% when the homopolystyrene molecular weight is greater than the molecular weight of the polystyrene block of the copolymer. This observation is discussed in terms of the decreased degree of mixing between the homopolymer and the corresponding block and the resultant effect on the interfacial curvature.

Crystallization-driven one-dimensional self-assembly of polyethylene-b-poly(tert-butylacrylate) diblock copolymers in DMF: effects of crystallization temperature and the corona-forming block

Soft Matter ◽  
2016 ◽  
Vol 12 (1) ◽  
pp. 67-76 ◽  
Author(s):  
Bin Fan ◽  
Lei Liu ◽  
Jun-Huan Li ◽  
Xi-Xian Ke ◽  
Jun-Ting Xu ◽  
...  
Keyword(s):  
Crystallization Temperature ◽  
Self Assembly ◽  
Diblock Copolymers ◽  
Block Length ◽  
One Dimensional ◽  
Cylindrical Micelles

Crystallization temperature and the PtBA block length affect the growth of crystalline PE-b-PtBA cylindrical micelles, and quasi-living growth can be achieved.

Effects of Adsorbing-Block Molecular Weight on the Thickness of Adsorbed Diblock Copolymers

Langmuir ◽  
1994 ◽  
Vol 10 (9) ◽  
pp. 3156-3160 ◽  
Author(s):  
Richard M. Webber ◽  
John L. Anderson
Keyword(s):  
Molecular Weight ◽  
Diblock Copolymers

Analysis of randomly oriented structures by grazing-incidence small-angle neutron scattering

2012 ◽  
Vol 45 (2) ◽  
pp. 245-254 ◽  
Author(s):  
Denis Korolkov ◽  
Peter Busch ◽  
Lutz Willner ◽  
Emmanuel Kentzinger ◽  
Ulrich Rücker ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Small Angle ◽  
Diblock Copolymers ◽  
Weight Fraction ◽  
Grazing Incidence ◽  
Force Microscopy ◽  
Self Organized ◽  
Atomic Force ◽  
Instrumental Resolution ◽  
Evaluation Of Data

A formalism is presented which allows the quantitative evaluation of data from grazing-incidence small-angle neutron and X-ray scattering – GISANS and GISAXS – in the framework of the distorted wave Born approximation. While several aspects have been reported previously, this formalism combines solutions for scattering intensities in both reflection and transmission hemispheres, taking into account instrumental resolution effects. This formalism is applied to the case of GISANS from self-organized diblock copolymers, ordered in perpendicular lamellar structures on an Si wafer in randomly oriented short-range-ordered regions. The periodicity ofD= 85 (9) nm found for deuterated polystyrene–polybutadiene of molecular weight  Mw= 165 kg mol−1and a molecular weight fraction of the deuterated polystyrene block of 52% is consistent with atomic force microscopy and specular neutron reflectivity results.

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