Side‐chain crystallization and phase transition of poly[styrene‐<i>co</i>‐(maleic anhydride)]‐<i>g</i>‐alkylamine comb‐like polymers

Mao, Huiqin; Wang, Yanpeng; Wang, Haixia; Li, Lang; Shi, Haifeng

doi:10.1002/pi.6283

Cited by 4 publications

(1 citation statement)

References 48 publications

(166 reference statements)

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“…, one with a large degree of conformational freedom, are generally amorphous in the bulk state unless strong intermolecular forces operate between the main chains. However, when long-range molecular ordering of amorphous polymers into a well-defined anisotropic structure is achieved, it not only improves the physical properties of the original polymer but also offers the potential to develop new mechanical and optical materials, along with new thermal management and patterning systems. − One common method to achieve this is to attach self-assembling motifs that impart particular intermolecular forces to the main chains of polymers. − Examples of such self-assembling motifs include long alkyl chains, − perfluoroalkyl chains, hydrogen bonding motifs, − and π-conjugated mesogens used for liquid-crystal designs. − These can undergo crystalline self-assembly and may also facilitate microphase separation between the main and side chains.…”

Section: Introductionmentioning

confidence: 99%

Effective Design for Long-Range Polymer Ordering Using Triptycene-Containing Side Chains

Itagaki

Chen

et al. 2023

Macromolecules

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Spontaneous long-range structural ordering of polymers can lead to improvements in their physical properties and the emergence of functions that cannot be expected in their amorphous states. We have demonstrated a design strategy to achieve structuring of various polymers using a particular type of triptycene, capable of forming a two-dimensional assembly. In this study, we investigated what designs are effective for achieving long-range polymer ordering by incorporating this triptycene motif into the side chains of polymers. Using poly(n-butyl acrylate) as a fundamental polymer, we synthesized three types of copolymers, i.e., random, diblock, and ABA-type triblock copolymers, through RAFT polymerization protocols and found that the presence of block segments is essential to achieve polymer ordering, which in turn results in dramatically improved mechanical properties. Here, we also show that poly(N-isopropylacrylamide)-based copolymers with triptycene-containing side chains undergo an interesting anisotropic expansion and contraction microscopically in response to temperature.

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Section: Introductionmentioning

confidence: 99%

Effective Design for Long-Range Polymer Ordering Using Triptycene-Containing Side Chains

Itagaki

Chen

et al. 2023

Macromolecules

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Stiffness Variable Polymers Comprising Phase‐Changing Side‐Chains: Material Syntheses and Application Explorations

et al. 2022

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lack the adaptability biological muscles have for variable working environments. Emerging opportunities in airborne and submarine vehicles, agricultural manipulations, biomedical devices, and wearable electronics require materials with variable rigidity to respond to dynamically changing conditions. [3][4][5][6] The mechanical impedance of such materials can be altered or fine-tuned to allow the system to adapt without a sophisticated control algorithm. For example, when grasping a fragile object such as an egg using a gripper, a stiffness variable material provides an adaptive contact force to optimally complete the task. Similarly, bio-inspired robots and wearable exoskeletons require stiffness variable materials capable of a large stiffness change to provide structural load-bearing and mechanical work output. In the softened state, the material can deform to locomote, maneuver, and absorb the energy arising from a collision or when interfacing with the human body. Some applications, such as medical endoscope designs, involve "move-and-hold" operations. This is where a variable-stiffness structure that holds a particular orientation in space or rigidly supports a load is able to become deformable on demand to change shape or reposition. [7] Other potential applications that can benefit from variable stiffness materials include biomechanically compatible sensor insertions for neural implants, vibration, and noise control in aerospace structures, and conformal shape morphing robotic systems. Requirements of Stiffness Variable MaterialsTo impart the perceived smart and adaptive systems with versatile and advantageous functionalities matching or surpassing those of natural systems, the stiffness variable materials should possess the following important features:1. Wide modulus variation: A range of modulus variation greater than 100 or even 1000-fold is required. A high modulus is desired for load-bearing and supporting freestanding structures, while a low modulus provides conformation, shape transformation, energy absorption, and dissipation. 2. Mild stimulus: A mild stimulus to trigger the stiffness variable operation, such as a narrow temperature span in Stiffness variable materials have been applied in a variety of engineering fields that require adaptation, automatic modulation, and morphing because of their unique property to switch between a rigid, load-bearing state and a soft, compliant state. Stiffness variable polymers comprising phase-changing side-chains (s-SVPs) have densely grafted, highly crystallizable long alkyl sidechains in a crosslinked network. Such a bottlebrush network-like structure gives rise to rigidity modulation as a result of the reversible crystallization and melting of the side chains. The corresponding modulus changes can be more than 1000-fold within a narrow temperature span, from ≈10 2 MPa to ≈10 2 kPa or lower. Other important properties of the s-SVP, such as stretchability, optical transmittance, and adhesion, can also be altered. This work reviews the underlying molecular mech...

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Thermal properties and shape-stabilization of poly(propylene-graft-maleic anhydride)-g-alkyl alcohol comb-like polymeric phase change thermal energy storage materials

Liu,

Wang,

Liu

et al. 2024

Journal of Energy Storage

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Side‐chain crystallization and phase transition of poly[styrene‐co‐(maleic anhydride)]‐g‐alkylamine comb‐like polymers

Cited by 4 publications

References 48 publications

Effective Design for Long-Range Polymer Ordering Using Triptycene-Containing Side Chains

Effective Design for Long-Range Polymer Ordering Using Triptycene-Containing Side Chains

Stiffness Variable Polymers Comprising Phase‐Changing Side‐Chains: Material Syntheses and Application Explorations

Thermal properties and shape-stabilization of poly(propylene-graft-maleic anhydride)-g-alkyl alcohol comb-like polymeric phase change thermal energy storage materials

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