Journal of Polymer Science

ABSTRACT Poly(lactic acid) (PLA) is regularly blended with poly(butylene adipate‐ co ‐terephthalate) (PBAT) to produce compostable plastic films used in packaging applications, for example. Since PLA and PBAT both contain ester bonds, these PBAT/PLA blends are interesting candidates for enzymatic recycling. This is a new, green recycling technique that allows the use of mild processing conditions to regenerate the pure building blocks of polymers, thereby enabling repolymerization to virgin‐quality plastic. In this work, various PBAT/PLA blends are prepared (20, 40, 60, and 80 wt% PBAT) and incubated with a cutinase enzyme from Humicola insolens (HiC). Enzymatic degradation is characterized by weight loss, scanning electron microscopy (SEM), and proton nuclear magnetic resonance ( 1 H NMR) spectroscopy. Blends rich in PBAT are effectively degraded by HiC (up to 40% weight loss after 7 days of incubation at 70°C), while PLA‐rich blends are degraded to a lesser extent. HiC is capable of degrading both polymers, although for PLA, the extent of degradation is similar to control experiments without HiC. Furthermore, in the absence of an enzyme, a “shielding” effect is found for nonenzymatic degradation, where a hydrolytically stable PBAT matrix prevents the degradation of the PLA domains. This work provides insight into the enzymatic degradation of uncompatibilized polymer blends and opens up the possibility for the enzymatic recycling of commercial PBAT/PLA blends.

Joël Benninga

Guilherme Macedo R. Lima

Gábor Érsek

Giuseppe Portale

Rudy Folkersma

Vincent S. D. Voet

Katja Loos

Enzymatic Degradation of Poly(Butylene Adipate‐co‐Terephthalate)/Poly(Lactic Acid) Blends

聚(己二酸丁二醇酯-共对苯二甲酸酯)/聚乳酸共混物的酶降解

Abstract Adhesive hydrogels have broad applications in tissue adhesives, hemostatic agents, and biomedical sensors. Various bio‐inspired glues and synthetic adhesives are clinically used as conventional hemostatic agents and auxiliary tools for wound closure. Medical adhesives are needed to effectively and quickly control bleeding, thereby reducing the risk of complications caused by severe blood loss. Medical sensors need to have excellent skin compliance, mechanical properties, sensitivity, and biological safety. This review focuses on recent progress in adhesive hydrogel systems, their structures, adhesion mechanisms, construction strategies, and emerging applications in the biomedical field.

Xinjie Pei

Jintao Wang

Yang Cong

Jun Fu

Recent progress in polymer hydrogel bioadhesives

聚合物水凝胶生物粘附剂的最新进展

Abstract Polymer agglomeration is a useful way to enlarge the particle size of polybutadiene latex (PBL). However, the agglomeration process is very complex and is affected by many factors. Therefore, it is difficult to predict the mean particle size and distribution of agglomerated PBL. This study proposed a novel simulation method based on the artificial neural network (ANN) model. Firstly, the influence of agglomeration conditions on the particle size of agglomerated PBL were investigated, including the particle size of pre‐agglomerate PBL, the amount, the α‐methacrylic acid (α‐MAA) content, the solid content and the particle size of agglomerating agent. It is found that these factors have a close nonlinear relationship with the mean particle size and polydispersion index (PDI) of agglomerated PBL. Then, a model containing 236 data points was built using ANN including these properties as input with mean particle size and PDI of agglomerated PBL as output. The coefficient of determination ( R 2 ) values predicted by ANN for training, validation, test and total data are 0.9879, 0.9964, 0.9930, and 0.9902, respectively. It indicates that there is a good agreement between experimental data and predicted results by ANN. This study demonstrates that a simple machine learning method has good performance in predicting the particle size of agglomerated PBL, which further improves the development efficiency of PBL polymer agglomeration.

Li Zhao

Shulai Lu

Ming Chen

Yuchao Wang

Shicheng Zhao

Artificial neural network prediction of particle size of agglomerated polybutadiene latex

聚丁二烯胶乳团聚粒径的人工神经网络预测

ABSTRACT Utilizations of alkylboranes reagents in radical polymerization are summarized in this minireview. Alkylboranes act as conventional radical initiators or radical chain‐transfer agents in free‐radical polymerization and controlled radical polymerization. This review discusses various polymerizations operating through different alkylborane reagents with their accompanying mechanisms. The aim of this minireview is to present the state of art of alkylboranes in radical polymerization and to provide the future aspects of this direction. © 2019 Wiley Periodicals, Inc. J. Polym. Sci. 2020 , 58 , 14–19

Chunna Lv

Yuxuan Du

Xiangcheng Pan

Alkylboranes in Conventional and Controlled Radical Polymerization

常规与可控自由基聚合中的烷基硼烷

Abstract Poly (vinylidene fluoride‐ co ‐trifluoroethylene) [P(VDF‐TrFE)] has three crystal forms, including paraelectric α, ferroelectric β, and γ phases. In previous studies, the properties and performances of P(VDF‐TrFE) have been the focus of research. However, the formation mechanism and regulation mode of various crystal forms remain unclear. Therefore, it is an important topic for further research to elucidate, summarize, and prospect the polymorphism of P(VDF‐TrFE) and regulate the crystal forms. This review systematically summarizes the crystalline structure and phase transition between ferroelectric and paraelectric phase of P(VDF‐TrFE) crystals; discusses the influence of annealing, blending and electric field on the crystallinity, selection of polymorphic crystals, and phase transition behavior between them; reviews the effects of annealing, melt‐recrystallization, substrate and nanoconfinement on the crystal orientation. Finally, the effects of the crystal structure of P(VDF‐TrFE) on its properties are briefly summarized.

Xiao Bai

Haikuo Li

Xiao Chu

Mengling Liu

Huihui Li

Haijun Wang

Xiaoli Sun

Shouke Yan

The tuning of crystallization behavior of ferroelectric poly(vinylidene fluoride‐co‐trifluoroethylene)

铁电聚（偏二氟乙烯-共-三氟乙烯）结晶行为的调控

ABSTRACT We investigated the photovoltaic and piezoelectric power generation characteristics of ferroelectric poly(vinylidene fluoride‐ran‐trifluoroethylene, PVDF‐TrFE) thin films on flexible indium tin oxide (ITO)/polyethylene terephthalate (PET) substrates. The solar cells and piezoelectric hybrid devices provide consistent energy to extend battery life and improve self‐charging. The flexible PVDF‐TrFE thin films with a transmittance of about 60% in the visible region showed a remanent polarization of about 10.5 μC/cm 2 (2P r ~ 21.0 μC/cm 2 ) with excellent β‐phase formation. The flexible PVDF‐TrFE thin films exhibited optimal ferroelectric and piezoelectric properties by exhibiting β‐phase without α‐phase. Since β‐phase is the phase that carries high dipole alignment of the material, which is important for maximizing power output, the performance of the material in photovoltaic and piezoelectric applications is enhanced. The PVDF‐TrFE capacitor exhibited not only a piezoelectric generation characteristic with an approximate voltage of 1.1 V under compression, but also a photovoltaic generation feature with an open‐circuit voltage of about 0.23 V and a short‐circuit current of approximately 0.13 mA/cm 2 .

Eunmi Lee

Jong Yeog Son

Photovoltaic and Piezoelectric Power Generation Characteristics of Flexible Poly(Vinylidene Fluoride‐Ran‐Trifluoroethylene) Thin Films

柔性聚(偏氟乙烯-三氟乙烯)共聚物薄膜的光伏与压电发电特性

ABSTRACT The reaction of organogallium amide LGa(NEt2)2 (1) and organotin carbonate L(Ph)SnCO3 (2), where L = 2,6‐(Me2NCH2)2C6H3, with organoboronic acids RB(OH)2 yielded molecular gallium‐ and stannaboroxines LM(O3B2R2) (3–8) (3: M = Ga, R = 4‐tBu‐C6H4; 4: M = Ga, R = 4‐CF3‐C6H4; 5: M = Ga, R = 3,5‐(CF3)2‐C6H3; 6: M = PhSn, R = 4‐tBu‐C6H4; 7: M = PhSn, R = 4‐CF3‐C6H4; 8: M = PhSn, R = 3,5‐(CF3)2‐C6H3). The Lewis acidity of boron atom (especially in 8) allowed to form N → B coordination bond with bases such as 4‐Me2N‐pyridine (DMAP) or poly(4‐vinylpyridine‐co‐styrene) (PVPS) yielding new compounds DMAP→8 (9) and PVPS→8 (10). The good film forming properties of 10 allowed the deposition of transparent thin layers by spin‐coating method and the determination of their hydrophobic properties by the sessile drop method. The study of hydrophobicity was subsequently focused on the content of stannaboroxine 8 in PVPS and on the concentration influence of the deposited PVPS:8 mixture solution. The parameters of thin layers such as thickness, transparency, and roughness were also determined.

Miroslav Novák

Michael Srb

Jiří Schwarz

Zdeňka Růžičková

Marek Bouška

Štěpán Podzimek

Pavlína Ruleová

Roman Jambor

Hydrophobic Thin Layers Based on N‐Coordinated Metallaboroxine Polymers

基于N配位金属硼氧烷聚合物的疏水薄膜

ABSTRACT To improve the modulus and tensile strength of polyimide films, this study utilized diamines with amide bonds as monomers, introducing hydrogen bonding into the material. Additionally, a microbranched cross‐linked structure was created by incorporating a triamino compound, and its effect on film properties was analyzed. The results showed that the microbranched cross‐linked structure and amide bonding significantly improved the storage modulus, tensile strength, shape memory properties, and toughness of the polyimide films. Specifically, at 2% concentration of 1,3,5‐tris(4‐aminophenoxy)benzene, the storage modulus of the polyimide films reached 12.97GPa, the tensile strength was 243 MPa, the elongation at break was 5.58%, and the toughness was improved by 2.59 times. At this concentration, the shape fixation rate of normal polyimide was 96.7%, and the shape recovery rate was 92%. These findings suggest that the modified polyimide films exhibit high strength and are suitable for applications in high‐temperature environments.

Xiansheng He

Mingkun Xu

Qian Dou

Yanhui Li

Qihua Wang

Tingmei Wang

Liming Tao

Preparation of High Mechanical Performance Polyimides by Microbranched Cross‐Linked Structures

通过微支化交联结构制备高性能聚酰亚胺

ABSTRACT This study reports the synthesis and characterization of ABCBA‐type pentablock copolymers comprising poly(cyclohexene oxide) (PCHO) as the A block, poly(ε‐caprolactone) (PCL) or poly(L‐lactide) (PLLA) as the B block, and polystyrene (PSt) as the C block. The target pentablock copolymers, PCHO‐PCL‐PSt‐PCL‐PCHO and PCHO‐PLLA‐PSt‐PLLA‐PCHO, were synthesized through a sequential combination of ring‐opening polymerization (ROP), free radical polymerization (FRP), and, for the first time to the best of our knowledge, photoinduced free‐radical‐promoted cationic polymerization (FRPCP) in pentablock copolymer synthesis. In the initial ROP step, well‐defined Bz‐PCL and Bz‐PLLA macrophotoinitiators were synthesized with photoactive benzoin (Bz) end groups. Next, Bz‐PCL and Bz‐PLLA were converted to the macro‐azo initiators, Bz‐PCL‐NN‐PCL‐Bz and Bz‐PLLA‐NN‐PLLA‐Bz, by esterification with 4,4′‐azobis(4‐cyanovaleric acid) (ACVA). These macro‐azo initiators were employed as initiators in the FRP of styrene to form triblock copolymers, which were then used as prepolymers in the photoinduced FRPCP of cyclohexene oxide (CHO) to produce the pentablock structures. Structural characterization conducted via FT‐IR and 1 H NMR spectroscopy confirmed the presence of each polymer segment within the pentablock architecture, and gel permeation chromatography (GPC) analysis further validated pentablock formation, showing unimodal distributions. UV–Vis and fluorescence measurements also verified the successful incorporation of the benzoin groups. This multistep synthetic strategy introduces an effective approach for constructing ABCBA‐type pentablock copolymers, which might find the potential uses in advanced material design.

Mustafa Degirmenci

Ulku Arslan

Sevin Abdulrahman

Rohat Habib

Zafer Uyar

Synthesis of <scp>ABCBA</scp>‐Type Pentablock Copolymers via Sequential Ring‐Opening, Free Radical, and Photoinduced Free‐Radical‐Promoted Cationic Polymerization Methods

通过顺序开环、自由基和光诱导自由基促进阳离子聚合方法合成<scp>ABCBA</scp>型五嵌段共聚物

ABSTRACT We present a heat‐resistant strong adhesive system consisting of aromatic polyamide substituted with N ‐ tert ‐butoxycarbonyl (Boc) groups, synthesized by polycondensation of bis(4‐Boc‐aminophenyl) ether ( 1 ) and isophthaloyl chloride ( 2 ), together with a thermal acid generator (TAG). Upon heating, the Boc groups are readily removed by the TAG‐generated acid, affording N ‐H polyamide. Adhesion was conducted at 150°C or 250°C under a pressure of 10 kgf/cm 2 for 7 h to eliminate voids due to Boc‐derived gaseous CO 2 and isobutene. For metal adherends treated at 150°C, the adhesion strength was 2–3 MPa. However, upon treatment at 250°C, above the T g of N ‐H polyamide (236°C), the adhesion strength reached 7.43–6.25 MPa for sandblasted steel plate, cold commercial (SPCC) and stainless steel. Next, we prepared copolyamides with lower T g values from 1 , bis(4‐methylaminophenyl) ether ( 3 ), and 2 . Upon treatment at 150°C, the adhesion strength of SPCC with copolyamide consisting of 30% 1 and 70% 3 reached 6.83 MPa. As regards heat resistance, SPCC treated with N ‐Boc polyamide/TAG at 250°C maintained an adhesion strength of 7.0–7.5 MPa from room temperature to 250°C, whereas SPCC treated with copolyamide/TAG at 150°C maintained an adhesion strength of 6.8–8.2 MPa up to 200°C.

Takayoshi Katoh

Kaede Takai

Izumi Shirakawa

Shun Takahashi

Yuki Morota

Yoshihiro Ohta

Masato Akimoto

Tsutomu Yokozawa

Heat‐Resistant Strong Adhesive Consisting of Aromatic Polyamide With an Acid‐Removable N‐Protecting Group and a Thermal Acid Generator

耐热强粘合剂：由含酸可去除N-保护基团的芳香聚酰胺和热酸生成剂组成

短名	J. Polym. Sci.
Journal Impact	3.76
国际分区	POLYMER SCIENCE(Q2)
期刊索引	SCI Q2中科院 3 区

ISSN	2642-4150, 2642-4169
h-index	164
国内分区	化学(3区)化学高分子科学(3区)

涉及主题	化学物理材料科学有机化学复合材料工程类核磁共振聚合物高分子化学量子力学生物化学工程生物化学共聚物计算机科学纳米技术聚合单体热力学机械工程
出版信息	出版商: John Wiley & Sons Inc.，出版周期: ，期刊类型: journal，开源期刊: 否
基本数据	创刊年份: 2020，原创研究文献占比: 84.55%，自引率:2.60%， Gold OA占比: 18.25%

Journal of Polymer Science

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