Effect of Terminal Modification on the Molecular Assembly and Mechanical Properties of Protein-Based Block Copolymers.

Abstract:

:Accurate prediction and validation of the assembly of bioinspired peptide sequences into fibers with defined mechanical characteristics would aid significantly in designing and creating materials with desired properties. This process may also be utilized to provide insight into how the molecular architecture of many natural protein fibers is assembled. In this work, computational modeling and experimentation are used in tandem to determine how peptide terminal modification affects a fiber-forming core domain. Modeling shows that increased terminal molecular weight and hydrophilicity improve peptide chain alignment under shearing conditions and promote consolidation of semicrystalline domains. Mechanical analysis shows acute improvements to strength and elasticity, but significantly reduced extensibility and overall toughness. These results highlight an important entropic function that terminal domains of fiber-forming peptides exhibit as chain alignment promoters, which ultimately has notable consequences on the mechanical behavior of the final fiber products.

journal_name

Macromol Biosci

authors

Jacobsen MM,Tokareva OS,Ebrahimi D,Huang W,Ling S,Dinjaski N,Li D,Simon M,Staii C,Buehler MJ,Kaplan DL,Wong JY

doi

10.1002/mabi.201700095

subject

Has Abstract

pub_date

2017-09-01 00:00:00

issue

9

eissn

1616-5187

issn

1616-5195

journal_volume

17

pub_type

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