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Title: Rapid assessment of crystal orientation in semi-crystalline polymer films using rotational zone annealing and impact of orientation on mechanical properties

Abstract

Crystal orientation in semi-crystalline polymers tends to enhance their performance, such as increased yield strength and modulus, along the orientation direction. Zone annealing (ZA) orients the crystal lamellae through a sharp temperature gradient that effectively directs the crystal growth, but the sweep rate (V ZA) of this gradient significantly impacts the extent of crystal orientation. Here in this work, we demonstrate rotational zone annealing (RZA) as an efficient method to elucidate the influence of V ZA on the crystal morphology of thin films in a single experiment using isotactic poly(1-butene), PB-1, as a model semi-crystalline polymer. These RZA results are confirmed using standard, serial linear ZA to tune the structure from an almost unidirectional oriented morphology to weakly oriented spherulites. The overall crystallinity is only modestly changed in comparison to isothermal crystallization (maximum of 55% from ZA vs. 48% for isothermal crystallization). However, the average grain size increases and the spherulites become anisotropic from ZA. Due to these structural changes, the Young's modulus of the oriented films, both parallel and perpendicular to the spherulite orientation direction, is significantly increased by ZA. The modulus does become anisotropic after ZA due to the directionality in the crystal structure, with more than amore » threefold increase in the modulus parallel to the orientation direction for the highest oriented film in comparison to the modulus from isothermal crystallization. Lastly, RZA enables rapid identification of conditions to maximize orientation of crystals in thin polymer films, which could find utility in determining conditions to improve crystallinity and performance in organic electronics.« less

Authors:
 [1]; ORCiD logo [1];  [2];  [1];  [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [3]; ORCiD logo [1]
  1. Univ. of Akron, OH (United States). Department of Polymer Engineering
  2. Univ. of Akron, OH (United States). Department of Polymer Science
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1430874
Report Number(s):
BNL-203428-2018-JAAM
Journal ID: ISSN 1744-683X; SMOABF
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Soft Matter
Additional Journal Information:
Journal Volume: 13; Journal Issue: 39; Journal ID: ISSN 1744-683X
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Ye, Changhuai, Wang, Chao, Wang, Jing, Wiener, Clinton G., Xia, Xuhui, Cheng, Stephen Z. D., Li, Ruipeng, Yager, Kevin G., Fukuto, Masafumi, and Vogt, Bryan D. Rapid assessment of crystal orientation in semi-crystalline polymer films using rotational zone annealing and impact of orientation on mechanical properties. United States: N. p., 2017. Web. doi:10.1039/C7SM01366C.
Ye, Changhuai, Wang, Chao, Wang, Jing, Wiener, Clinton G., Xia, Xuhui, Cheng, Stephen Z. D., Li, Ruipeng, Yager, Kevin G., Fukuto, Masafumi, & Vogt, Bryan D. Rapid assessment of crystal orientation in semi-crystalline polymer films using rotational zone annealing and impact of orientation on mechanical properties. United States. doi:10.1039/C7SM01366C.
Ye, Changhuai, Wang, Chao, Wang, Jing, Wiener, Clinton G., Xia, Xuhui, Cheng, Stephen Z. D., Li, Ruipeng, Yager, Kevin G., Fukuto, Masafumi, and Vogt, Bryan D. Thu . "Rapid assessment of crystal orientation in semi-crystalline polymer films using rotational zone annealing and impact of orientation on mechanical properties". United States. doi:10.1039/C7SM01366C. https://www.osti.gov/servlets/purl/1430874.
@article{osti_1430874,
title = {Rapid assessment of crystal orientation in semi-crystalline polymer films using rotational zone annealing and impact of orientation on mechanical properties},
author = {Ye, Changhuai and Wang, Chao and Wang, Jing and Wiener, Clinton G. and Xia, Xuhui and Cheng, Stephen Z. D. and Li, Ruipeng and Yager, Kevin G. and Fukuto, Masafumi and Vogt, Bryan D.},
abstractNote = {Crystal orientation in semi-crystalline polymers tends to enhance their performance, such as increased yield strength and modulus, along the orientation direction. Zone annealing (ZA) orients the crystal lamellae through a sharp temperature gradient that effectively directs the crystal growth, but the sweep rate (VZA) of this gradient significantly impacts the extent of crystal orientation. Here in this work, we demonstrate rotational zone annealing (RZA) as an efficient method to elucidate the influence of VZA on the crystal morphology of thin films in a single experiment using isotactic poly(1-butene), PB-1, as a model semi-crystalline polymer. These RZA results are confirmed using standard, serial linear ZA to tune the structure from an almost unidirectional oriented morphology to weakly oriented spherulites. The overall crystallinity is only modestly changed in comparison to isothermal crystallization (maximum of 55% from ZA vs. 48% for isothermal crystallization). However, the average grain size increases and the spherulites become anisotropic from ZA. Due to these structural changes, the Young's modulus of the oriented films, both parallel and perpendicular to the spherulite orientation direction, is significantly increased by ZA. The modulus does become anisotropic after ZA due to the directionality in the crystal structure, with more than a threefold increase in the modulus parallel to the orientation direction for the highest oriented film in comparison to the modulus from isothermal crystallization. Lastly, RZA enables rapid identification of conditions to maximize orientation of crystals in thin polymer films, which could find utility in determining conditions to improve crystallinity and performance in organic electronics.},
doi = {10.1039/C7SM01366C},
journal = {Soft Matter},
number = 39,
volume = 13,
place = {United States},
year = {2017},
month = {8}
}

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Works referenced in this record:

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