Cited by 206Advanced Materials and MechanicsPolymer composites and self-healingAdvanced Cellulose Research Studies

PH-responsive shape memory poly(ethylene glycol)–poly(ε-caprolactone)-based polyurethane/cellulose nanocrystals nanocomposite

Li, Ying, Chen, Hongmei, Liu, Dian, Wang, Wenxi, Liu, Ye, Zhou, Shaobing·2015·ACS Applied Materials & Interfaces

Abstract

In this study, we developed a pH-responsive shape-memory polymer nanocomposite by blending poly(ethylene glycol)-poly(ε-caprolactone)-based polyurethane (PECU) with functionalized cellulose nanocrystals (CNCs). CNCs were functionalized with pyridine moieties (CNC-C6H4NO2) through hydroxyl substitution of CNCs with pyridine-4-carbonyl chloride and with carboxyl groups (CNC-CO2H) via 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) mediated surface oxidation, respectively. At a high pH value, the CNC-C6H4NO2 had attractive interactions from the hydrogen bonding between pyridine groups and hydroxyl moieties; at a low pH value, the interactions reduced or disappeared due to the protonation of pyridine groups, which are a Lewis base. The CNC-CO2H responded to pH variation in an opposite manner. The hydrogen bonding interactions of both CNC-C6H4NO2 and CNC-CO2H can be readily disassociated by altering pH values, endowing the pH-responsiveness of CNCs. When these functionalized CNCs were added in PECU polymer matrix to form nanocomposite network which was confirmed with rheological measurements, the mechanical properties of PECU were not only obviously improved but also the pH-responsiveness of CNCs could be transferred to the nanocomposite network. The pH-sensitive CNC percolation network in polymer matrix served as the switch units of shape-memory polymers (SMPs). Furthermore, the modified CNC percolation network and polymer molecular chains also had strong hydrogen bonding interactions among hydroxyl, carboxyl, pyridine moieties, and isocyanate groups, which could be formed or destroyed through changing pH value. The shape memory function of the nanocomposite network was only dependent on the pH variation of the environment. Therefore, this pH-responsive shape-memory nancomposite could be potentially developed into a new smart polymer material.

Integrity signals

Registry

Crossref · 10.1021/acsami.5b02940

Cites

61 of 61 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • CNCs containing SMCs were characterized by improved mechanical properties.

    “The CNCs containing SMCs were characterized by improved mechanical properties”
  • Modifying nanofiller surface with pyridine moieties [CNC-C6H4NO2] created a pH-sensitive CNCs percolation network in the polymer matrix, acting as switch units.

    “By modifying the nanofiller surface with pyridine moieties [CNCC6H4NO2] it was possible to create pH-sensitive CNCs percolation network in the polymer matrix, acting as the switch units of the materials.”
  • At low pH, these interactions were reduced or disappeared due to protonation of pyridine groups (Lewis base).

    “At low pH value, these interactions were reduced or disappeared due to the protonation of pyridine groups (Lewis base).”
  • At high pH, CNC-C6H4NO2 had attractive interactions from hydrogen bonding between pyridine groups and hydroxyl moieties.

    “The explored working idea here was that at high pH value, the CNC-C6H4NO2 had attractive interactions from the hydrogen bonding between pyridine groups and hydroxyl moieties.”
  • Functionalized CNCs can be used effectively for production of pH-responsive SMCs by blending PECU.

    “Functionalized CNCs can be used effectively for the production of pH-responsive SMCs by blending poly(ethylene glycol)poly( e -caprolactone)-based polyurethane (PECU) [186].”

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Li, Y., Chen, H., Liu, D., Wang, W., Liu, Y., & Zhou, S.
Affiliations
Southwest Jiaotong University (CN)
Corresponding author
Zhou, Shaobing
Venue
ACS Applied Materials & Interfaces
Published
2015-06-02
Volume
7
Issue
23
Pages
12988-12999
ISSN
  • 1944-8244 (ISSN-L)
  • 1944-8252
OpenAlex
W2462962971
Cited by
206
References
60
Citations by year
2026: 13 · 2025: 18 · 2024: 15 · 2023: 19 · 2022: 19 · 2021: 26 · 2020: 33 · 2019: 20 · 2018: 18 · 2017: 11 · 2016: 13 · 2015: 1
FWCI
14.08
Type
journal article
Language
en
Open access
closed
Locations
  • ACS Applied Materials & Interfaces (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Ministry of Education of the People's Republic of China (20120184110029)
  • Ministry of Science and Technology of the People's Republic of China (2012BAI17B06, 2012CB933600)
  • National Natural Science Foundation of China (51173150, 51373138)
  • Sichuan Province (14TD0050)
Topics
  • Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
  • Physical Sciences › Materials Science › Polymers and Plastics › Polymer composites and self-healing
  • Physical Sciences › Materials Science › Biomaterials › Advanced Cellulose Research Studies
Keywords
cellulose nanocrystals, pyridine functionalization, hydrogen bonding, carboxyl functionalization, TEMPO-mediated oxidation, percolation network, mechanical properties, stimuli-responsive polymers

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review