Crystalline structure and molecular dynamics in α α′ crystals of poly(l-lactide) (PLLA) PLLA/poly(d-lactide) (PDLA) stereocomplex (sc) have been investigated by the temperature-variable FTIR solid-state 13C CP-MAS NMR spectroscopy. The crystal forms polylactide (PLA) different band frequencies, correlation field splittings spectra line shapes, resonance spectra, which become more distinct with cooling to cryogenic conditions. well-resolved resonances crystals, attributable...

Competitive crystallization kinetics, polymorphic crystalline structure, and transition of poly(l-lactic acid)/poly(d-lactic acid) (PLLA/PDLA) racemic blends with a wide range molecular weights (MWs) were symmetrically investigated. Stereocomplex (sc) crystallites are exclusively formed in the low-MW blends. However, stereocomplexation is remarkably depressed, homocrystallization becomes prevailing increasing MWs PLLA PDLA. Suppressed high-MW (HMW) proposed to be due low chain diffusion...

Marine biofouling, resulting from the adhesion of marine organisms to ship surfaces, has long been a significant issue in maritime industry. In this paper, we focused on utilizing soft and hydrophilic hydrogels as potential approach for antifouling (AF) coatings. Acrylic acid (AA) with polyelectrolyte effect N-(3-sulfopropyl)-N-(methacryloxyethyl)-N,N-dimethylammonium betaine (SBMA) an antipolyelectrolyte were selected monomers. By adjusting monomer ratio, able create hydrogel coatings that...

Adhesion-switchable ionogels with ultralow hysteresis are developed through moisture-mediated phase separation using opposite-affinity ionic components. These show great potential in smart adhesives for targeted object capture.

Stereocomplex (SC) crystallization has been an effective method to improve the heat resistance of poly(lactic acid) (PLA). However, preparation SC-type PLA material is still a challenge because SC much less prevailing than homocrystallization in high-molecular-weight (HMW) poly(l-lactic acid)/poly(d-lactic (PLLA/PDLA) racemic blends. In this study, we have successfully promoted formation and controlled crystal morphology HMW PLLA/PDLA blend by using self-assemblable aryl amide nucleator,...

Poly(ethylene glycol)-b-poly(L-lactic acid)-b-poly(D-lactic acid) (PEG-b-PLLA-b-PDLA) stereoblock copolymers were synthesized by sequential ring-opening polymerization. Their micelle formation, precise structure, biodegradation, and drug release behavior systematically investigated compared with the PEG-b-poly(lactic (PEG-b-PLA) diblock various PLA stereostructures PEG-b-PLLA/PEG-b-PDLA enantiomeric mixture. Stereoblock having comparable PLLA PDLA block lengths enantiomerically-mixed...

Stimuli-responsive shape-transforming hydrogels have shown great potential toward various engineering applications including soft robotics and microfluidics. Despite significant progress in designing with ever more sophisticated shape-morphing behaviors, an ultimate goal yet to be fulfilled is programmable reversible shape transformation. It reported here that transient structural anisotropy can programmed into copolymer of N-isopropylacrylamide stearyl acrylate. Structural arises from the...

Constructing dual or multiple noncovalent crosslinks is highly effective to improve the mechanical and stimuli-responsive properties of supramolecular physical hydrogels, due synergistic effects different bonds. Herein, a series tough hydrogels are prepared by solution casting subsequently swelling films poly(ureidopyrimidone methacrylate-co-stearyl acrylate-co-acrylic acid). The hydrophobic interactions between crystallizable alkyl chains quadruple hydrogen bonds ureidopyrimidone (UPy)...

Stereocomplex (SC) crystallization between polymer enantiomers has opened a promising avenue for preparing high-performance materials. However, high-crystallinity SCs are difficult to achieve high-molecular-weight (HMW) enantiomeric blends of chiral polymers [e.g., poly(lactic acid)]. Despite extensive studies, why HMW have difficulty in SC not been clarified. Herein, we chose the poly(l-lactic acid)/poly(d-lactic acid) (PLLA/PDLA) 1/1 blend as model system and demonstrated crucial role...

Layered double hydroxides (LDHs) are a class of promising cathode materials for supercapacitors. However, the bad cycling performance has always been Achilles’ heel LDHs‐based In this contribution, nonelectrochemical active element Scandium (Sc) is doped into NiCo‐LDHs to greatly improve intrinsic materials. The trimetallic NiCoSc‐LDHs exhibit an ultralong cycle lifespan with 40 000 charge–discharge cycles (exceeding 50 days) and high specific capacity 196 mAh g −1 (1695 F ). Sc doping...

Phase-transformable ionic conductors (PTICs) show significant prospects for functional applications due to their reversible resistance switching property. However, the representative design principle of PTICs is utilizing melt-crystallization transition liquids, and temperatures such cannot be tuned as desired. Herein, a new strategy proposed with on-demand by using polymer cocrystal phase, whose melting temperature shows linear relationship compositions. Owing melt domains tunable migration...

Linear, 3-arm, and 6-arm star-shaped stereo diblock copolymers of l- d-lactic acid (PLLA-b-PDLA) with high molecular weights (MWs) were synthesized via two-step ring-opening polymerization (ROP) 1-dodechanol, glycerol, d-sorbitol as the initiators, respectively. The chemical structure, nonisothermal isothermal crystallization kinetics, crystalline lamellar morphology, mechanical thermal properties PLLA-b-PDLAs different macromolecular topologies investigated. Compared to...

A series of triblock copolymers consisting the poly(ε-caprolactone-co-δ-valerolactone) (PCVL) soft midblock and poly(lactic acid) (PLA) hard end blocks were synthesized via sequential ring-opening polymerization. PCVL random copolyester was prepared by copolymerization ε-caprolactone (εCL) δ-valerolactone (δVL). has lower crystallization temperature but comparable crystallizability with poly(ε-caprolactone) homopolymer, indicating isomorphic εCL δVL. Molecular weight chemical composition...

Poly(glycolic acid) (PGA) is a unique biodegradable, aliphatic polyester having higher melting point (Tm) and better mechanical properties chemical resistance than its analogs. The unusual physical of PGA can be attributed to crystalline structure, chain packing interactions. Herein, we systematically investigated the spherulitic morphology, structural evolution in crystallization processes by time-resolved wide-angle X-ray diffraction (WAXD) FTIR spectrometry. exhibits fast it completely...

PLA/PEB SMPs with tunable shape memory and self-healing properties were prepared by end functionalization of PLA–PEB–PLA UPy units.

With commercial electronics transitioning toward flexible devices, there is a growing demand for high-performance polymers such as poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS). Previous breakthroughs in promoting the conductivity of PEDOT:PSS, which mainly stem from solvent-treatment and transfer-printing strategies, remain inevitable challenges due to inefficient, unstable, biologically incompatible process. Herein, scalable fabrication conducting PEDOT:PSS inks...

A hierarchical structure, defined as structural features occurring on different levels of scale, is widely used in the rational design composite electrodes for its superiorities abundant electrochemical active sites and functional differentiation various components. Herein, we situ prepare a nickel–cobalt layered double hydroxide (NiCo-LDH) nanosheet network ultrathin nickel–cobalt–zinc–sulfide (NiCoZnSx) microplate arrays to construct special, coral-inspired structure. In this NiCoZnSx not...

Stereocomplex (SC) crystallization has been an effective way to improve the physical properties of polymers. Poly(lactic acid) (PLA) is a representative stereocomplexable polymer, and PLA-based SC materials present higher strength modulus than common homocrystalline one. However, origins for better mechanical remain unclear. In this work, we prepared PLAs with different initial crystal polymorphs [SC, homocrystal (HC), SC/HC mixture] investigated their multiscale structural evolutions during...

Effects of poly(vinylidene fluoride) (PVDF) on the non-isothermal and isothermal crystallization kinetics, crystalline structure, spherulitic morphology poly(l-lactic acid) (PLLA) in their immiscible blends were investigated. Both cold melt crystallizations PLLA are accelerated after blending with PVDF. The rate further increases as PVDF content increases. does not crystallize upon cooling (10 °C/min) from melt, while it can almost sufficiently under same conditions 10% crystallizes process....