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Volumn 126, Issue 7, 2004, Pages 2058-2065

Modular Domain Structure: A Biomimetic Strategy for Advanced Polymeric Materials

Author keywords

[No Author keywords available]

Indexed keywords

ELASTICITY; FRACTURE TOUGHNESS; HYDROGEN BONDS; MOLECULAR STRUCTURE; POLYMERS; TENSILE STRENGTH;

EID: 1242319505     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja039127p     Document Type: Article
Times cited : (121)

References (42)
  • 29
    • 1242348783 scopus 로고    scopus 로고
    • note
    • In pulling the protected UPy control polymer B, we most time observed only a single peak. At about 0.1% rate, we observed two or more peaks on one curve. For those showing multiple peaks, they could not be fitted with the wormlike chain (WLC) model for a single chain, indicating that the multiple peaks originated from multiple chain adsorptions.
  • 30
    • 1242281462 scopus 로고    scopus 로고
    • note
    • In pulling the deprotected UPy modular polymer A, the success rate of picking up a chain is about 2%. In one set of experiments with a total of 48 force-extension curves, the statistical information is as follows: 6 curves show two peaks, 16 curves show three peaks, 16 curves show four peaks, 7 curves show five peaks, 2 curves show six peaks, and 1 curve shows seven peaks. Among all the unfolding peaks observed from this pool of curves, 52 peaks show peak force around 100 pN and 61 peaks show peak force around 200 pN. Of this pool of curves, about 70% of the final extension is in the range of 200-300 nm.
  • 31
    • 1242281464 scopus 로고    scopus 로고
    • tone
    • Whereas the single-molecule stretching data could be explained by other alternative mechanisms, we believe our current explanation is the simplest and most straightforward one to account for the experimental data. The difficulty here is that there is no definitive way to rule out any other possibility. The adsorption was done in very dilute polymer solution to avoid aggregation. Before collecting the force-extension data, the AFM tip was gradually pulled away from the surface step by step to get rid of weak nonspecific interactions and finally leave one single chain strongly adsorbed on the substrate and AFM tip. We did pick up multiple chains from time to time, but in those cases, the multiple peaks could not be fitted with the WLC single-chain model.
  • 32


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.