Chain Orientation in Block Copolymers Exhibiting Cylindrically Confined Crystallization

1998 ◽  
Vol 31 (15) ◽  
pp. 4891-4898 ◽  
Author(s):  
Daniel J. Quiram ◽  
Richard A. Register ◽  
Gary R. Marchand ◽  
Douglas H. Adamson
Keyword(s):  
Block Copolymers ◽  
Chain Orientation ◽  
Confined Crystallization

Confined crystallization in lamellae forming poly(3-(2′-ethyl)hexylthiophene) (P3EHT) block copolymers

2015 ◽  
Vol 54 (2) ◽  
pp. 205-215 ◽  
Author(s):  
Emily C. Davidson ◽  
Bryan S. Beckingham ◽  
Victor Ho ◽  
Rachel A. Segalman
Keyword(s):  
Block Copolymers ◽  
Confined Crystallization

Oriented Microstructures of Crystalline–Crystalline Block Copolymers Induced by Epitaxy and Competitive and Confined Crystallization

2016 ◽  
Vol 49 (15) ◽  
pp. 5576-5586 ◽  
Author(s):  
Claudio De Rosa ◽  
Rocco Di Girolamo ◽  
Finizia Auriemma ◽  
Maria D’Avino ◽  
Giovanni Talarico ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Confined Crystallization

scholarly journals Recent Developments in the Crystallization of PLLA-Based Blends, Block Copolymers, and Nanocomposites

2021 ◽  
Author(s):  
Amit Kumar Pandey ◽  
Shinichi Sakurai
Keyword(s):  
Block Copolymers ◽  
Liquid State ◽  
Triblock Copolymers ◽  
Nucleating Agent ◽  
The Third ◽  
Confined Crystallization ◽  
The Poor ◽  
The Matrix ◽  
Recent Developments ◽  
Poly Ethylene

Despite the extensive studies of poly(L-lactic acid)(PLLA), the crystallization of PLLA-based materials is still not completely understood. This chapter presents recent developments of crystallization of PLLA-based blends, block copolymers and nanocomposites. The first section of the chapter discusses the acceleration of PLLA crystallization by the inclusion of biobased (solid and liquid state) additives. It was found that the solid state additives work as a nucleating agent while the liquid-state additive works as a plasticizer. Both type of the additives can significantly enhance the crystallization of PLLA, as indicated by crystallization half-time (t0.5) values. Such composites are of great interest as they are 100% based on renewable resources. The second section talks about the enhanced formation of stereocomplex (SC) crystals in the PLLA/PDLA (50/50) blends by adding 1% SFN. It was found that the loading of SFN enhances the formation of SC crystals and it suppresses the formation of HC (homocrystal). The third section deals with confined crystallization of poly(ethylene glycol) (PEG) in a PLLA/PEG blend. The PLLA/PEG (50/50) blend specimen was heated up to 180.0°C and kept at this temperature for 5 min. Then, a two-step temperature-jump was conducted as 180.0°C → 127.0°C → 45.0°C. For this particular condition, it was found that PEG can crystallize only in the preformed spherulites of PLLA, as no crystallization of PEG was found in the matrix of the mixed PLLA/PEG amorphous phase. The last section describes the confined crystallization of PCL in the diblock and triblock copolymers of PLA-PCL. Furthermore, enantiomeric blends of PLLA-PCL and PDLA-PCL or PLLA-PCL-PLLA and PDLA-PCL-PDLA have been examined for the purpose of the improvement of the poor mechanical property of PLLA to which the SC formation of PLLA with PDLA components are relevant.

Phase Separation in the Melt and Confined Crystallization as the Key to Well-Ordered Microphase Separated Donor–Acceptor Block Copolymers

2013 ◽  
Vol 46 (11) ◽  
pp. 4403-4410 ◽  
Author(s):  
Ruth H. Lohwasser ◽  
Gaurav Gupta ◽  
Peter Kohn ◽  
Michael Sommer ◽  
Andreas S. Lang ◽  
...  
Keyword(s):  
Phase Separation ◽  
Block Copolymers ◽  
Confined Crystallization ◽  
Donor Acceptor

scholarly journals Dispersity and architecture driven self-assembly and confined crystallization of symmetric branched block copolymers

2019 ◽  
Vol 10 (39) ◽  
pp. 5385-5395 ◽  
Author(s):  
Louis M. Pitet ◽  
Bradley M. Chamberlain ◽  
Adam W. Hauser ◽  
Marc A. Hillmyer
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Block Polymers ◽  
Confined Crystallization

Architectural variety in the form of branching combined with disparate dispersities in block polymers have been exploited to access microphase morphologies outside the conventional phase windows typically observed in uniform linear analogs.

scholarly journals CONFINED CRYSTALLIZATION OF DENDRITIC BLOCK COPOLYMERS POLY(ε-CAPROLACTONE)-b-POLYSTYRENE ASYMMETRIC CHAIN END RESTRICTION

2011 ◽  
Vol 011 (4) ◽  
pp. 354-359 ◽  
Author(s):  
Fengbo ZHANG ◽  
Xuming XIE ◽  
Jinying YUAN ◽  
Weizhong YUAN ◽  
Qiang YAN
Keyword(s):  
Block Copolymers ◽  
Confined Crystallization

Self-Assembly of Hydrogels From Elastin-Mimetic Block Copolymers

2002 ◽  
Vol 724 ◽  
Author(s):  
Elizabeth R. Wright ◽  
R. Andrew McMillan ◽  
Alan Cooper ◽  
Robert P. Apkarian ◽  
Vincent P. Conticello
Keyword(s):  
Block Copolymers ◽  
Self Assembly ◽  
Triblock Copolymers ◽  
Variable Temperature ◽  
Inverse Temperature ◽  
Temperature Transition ◽  
Scanning Calorimetry ◽  
Design Synthesis ◽  
Inverse Temperature Transition ◽  
Functional Biomaterials

AbstractTriblock copolymers have traditionally been synthesized with conventional organic components. However, triblock copolymers could be synthesized by the incorporation of two incompatible protein-based polymers. The polypeptides would differ in their hydrophobicity and confer unique physiochemical properties to the resultant materials. One protein-based polymer, based on a sequence of native elastin, that has been utilized in the synthesis of biomaterials is poly (Valine-Proline-Glycine-ValineGlycine) or poly(VPGVG) [1]. This polypeptide has been shown to have an inverse temperature transition that can be adjusted by non-conservative amino acid substitutions in the fourth position [2]. By combining polypeptide blocks with different inverse temperature transition values due to hydrophobicity differences, we expect to produce amphiphilic polypeptides capable of self-assembly into hydrogels. Our research examines the design, synthesis and characterization of elastin-mimetic block copolymers as functional biomaterials. The methods that are used for the characterization include variable temperature 1D and 2D High-Resolution-NMR, cryo-High Resolutions Scanning Electron Microscopy and Differential Scanning Calorimetry.

Use of Nonionic Block Copolymers in Vaccines and Therapeutics

1998 ◽  
Vol 15 (2) ◽  
pp. 89-142 ◽  
Author(s):  
Mark J. Newman ◽  
Jeffrey K. Actor ◽  
Mannersamy Balusubramanian ◽  
Chinnaswamy Jagannath
Keyword(s):  
Block Copolymers

Mechanical and Structural Consequences of Associative Dynamic Cross-Linking in Acrylic Diblock Copolymers

2019 ◽  
Author(s):  
Jacob Ishibashi ◽  
Yan Fang ◽  
Julia Kalow
Keyword(s):  
Block Copolymers ◽  
Rheological Properties ◽  
Diblock Copolymers ◽  
Cross Linking ◽  
Statistical Copolymer

<p>Block copolymers are used to construct covalent adaptable networks that employ associative exchange chemistry (vitrimers). The resulting vitrimers display markedly different nanostructural, thermal and rheological properties relative to those of their statistical copolymer-derived counterparts. This study demonstrates that prepolymer sequence is a versatile strategy to modify the properties of vitrimers.</p>

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