Polymers
·
2021
·Vol. 13
·期 17
·2931
·
IF 4.329
Wanxin Peng,Jian Kang,Xiuduo Song,Yue Zhang,Bo Hu,Ya Cao,Ming Xiang
The effects of MXene on the crystallization behavior of β-nucleated isotactic polypropylene (iPP) were comparatively studied. The commonly used MXene Ti3C2Txwas prepared by selective etching and its structure and morphology were studied in detail. Then MXene and a rare earth β-nucleating agent (NA) WBG-II were nucleated with iPP to prepare samples with different polymorphic compositions. The crystallization, melting behavior, and morphologies of neat iPP, iPP/MXene, iPP/WBG-II, and iPP/MXene/WBG-II were comparatively studied. The crystallization behavior analysis reveals that a competitive relationship exists between MXene and WBG-II when they were compounded as α and β nucleating agents. In the system, the β-nucleation efficiency (NE) of WBG-II is higher than α-NE of MXene. The β-phase has relatively low thermal stability and would transform to α-phase when cooled below a critical temperature.Keywords:isotactic polypropylene;MXene;β-nucleating agent;polymorphic crystallization behavior
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer Crystallization
·
2020
·Vol. 3
·期 3
·e10125
·
IF 0
Rong Yang,Hongwei Cao,Weilong Chen,Lv Ding,Li Chen,Xin Zhang,Jinchun Li
Polymeric β-nucleating agents (β-NAs) have the advantages of good thermal stability, low toxicity, and relatively superior compatibility with isotactic polypropylene (iPP). However, endowing polymeric β-NAs with high efficiency remains a challenge. Herein, we report a strategy that incorporates ionic monomers into polymeric β-NAs to significantly enhance their nucleation efficiency. Sodium dimethyl 5-sulfonatoisophthalate, an ionic monomer, is introduced into a liquid crystalline polyester NA (PBDPS), and the resulting ionomer is named PBDPSi. The attractive interaction between the ion pairs acts as physical crosslinks and stabilizes the active nucleation center of the ordered benzene rings. Moreover, the ionic monomer modifies the viscosity of the liquid crystalline NA and improves the dispersibility of PBDPSi in the iPP matrix. In addition, it enhances the relative growth rate of β-spherulites of iPP. When 5% sulfonate monomer is introduced into the NA, PBDPSi exhibits the optimal β-nucleation effect, and the maximum value (0.97) of the relative content of β-iPP crystals ( k β ) is obtained. Compared with PBDPS, PBDPSi shows better β-nucleation performance, especially at low concentrations. The incorporation of 0.1 wt% PBDPSi into iPP provides a k β value of 0.41, which is almost four times that obtained with PBDPS.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
ACS Omega
·
2017
·
IF 0
Yijun Li,Xinyu Wen,Min Nie,Qi Wang
Dendritic β-nucleating agent (β-NA) can readily manipulate the formation of dendritic β-crystal with a unique toughening effect on polypropylene (PP) to drastically enhance the ductility. However, by the current method, the geometric size is too large to fully perform the nucleating efficiency. In this study, by comparatively investigating the effect of molecular weight of PP and diffusion of β-NAs in a PP melt, we proposed a novel carrier strategy that selective enrichment of β-NAs in a PP carrier was followed by directed migration into polymer matrix. Accordingly, the growth of NAs was controlled by the release from the PP carrier, which decreased the available amount of β-NAs during the growth stage. In this case, the viscosity difference between PP carrier and matrix determined the interfacial movement of β-NAs. When the PP carrier and matrix had same molecular weight, the diffusion and release became favorable to facilitate the formation of the dense and fine dendritic aggregates. As a result, the relative content of β-crystals reached 92%, with a drastic increase of ∼82% in the optimal condition compared to the directed compounded PP/β-NAs sample. This study can open a new avenue to tailor the topologies of β-NAs and the ensuing β-crystals for high-performance PP products.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
POLYMER
·
2025
·
IF 4.5
Innocent Toendepi,Hongbo Dai,Wei Liu,Yaofeng Zhu
The attainment of both high mechanical strength and good toughness has always been the ultimate goal for developing viable fiber-reinforced thermoplastic composites for critical structural applications in the aerospace and automobile fields. Most sized glass fiber reinforced polypropylene composites exhibit higher tensile and flexural strengths but lower impact resistance than commercial glass fiber reinforced polypropylene composites, which limits their future utilization in industry. In this work, an amphiphilic sizing agent as the interfacial modifier and a β-nucleating agent as the added toughener were simultaneously used to improve the mechanical properties of short glass fiber reinforced polypropylene composites and addition of a β-nucleating agent improved the impact resistance of the sized glass fiber reinforced polypropylene composite without degrading the tensile and flexural strengths. Additionally, polarized light microscope and differential scanning calorimetry demonstrated that the improved mechanical properties of the composites were attributed to the improved compatibility between glass fibers and polypropylene and the enhanced crystallization ability of polypropylene. Thus, the proposed method provides a way to balance the strength and toughness of composites.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER SCIENCE SERIES B
·
2020
·Vol. 62
·期 5
·473-482
·
IF 0.976
Henglun Cheng,Shang Mengyao,He Yuan,Shentu Baoqing,Gao Zhuyi
Abstract A phenyl-substituted terephthalamide β-nucleating agent, N,N '-diphenylterephthalamide (DPTH) was synthesized and characterized by Fourier transform infrared spectroscopy (FTIR) and 1 H nuclear magnetic resonance ( 1 H NMR). DPTH’s effect on the crystallization and melting behaviors in isotactic polypropylene (iPP) was investigated by differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD) and polarizing optical microscope (POM). The results illustrated that DPTH was an effective β-nucleating agent for iPP. The relative content of β-crystal ( k β ) increased with the rise of the DPTH content and reached a maximum of 0.652 at 0.6% DPTH content. The Avrami and Jeziorny methods were used to describe the nonisothermal crystallization kinetics of iPP. Higher crystallization rate constant Z c and lower halftime of crystallization t 1/2 were obtained in iPP containing DPTH.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2025
·
IF 3.2
Haohao Hou,Yu Xue,Meng Zhang,Xin He,Hongfu Zhou,Liyang Zhang
Polypropylene homopolymer (PPH) is a highly practical and widely utilized thermoplastic polymer that finds extensive applications in automotive components, piping systems, and constructed materials. Although PPH has merits such as low cost, versatility, and exceptional corrosion resistance, its low toughness limits application in specialized engineering sectors such as high-pressure piping, aerospace components, and cryogenic environments. In this paper, the toughness of PPH was improved by blending with polypropylene block copolymer (PPB) and β nucleating agent (NP-328). The room temperature impact strength of PPH containing 30% PPB and 0.2% NP-328 was increased by 4.4 times, and its low-temperature elongation at break was improved by 87%, compared to those of the pure PPH sample. Furthermore, this paper investigated the crystallization behaviors of PPH/PPB(70/30) with varying amounts of NP-328, using crystallization kinetics studies for analysis. The crystallization rate of PPH/PPB (70/30) systems gradually adding the amounts of NP-328 improved significantly. At 140°C, the half-crystallization time of the PPH/PPB (70/30) containing 0.2% NP-328 decreased by 14.5 min compared with that of PPH/PPB (70/30) without NP-328. The high-toughness PPH material developed in this work exhibits significant potential for application across a variety of industries, including automotive manufacturing, home appliance production, and packaging sector, among others. Highlights IS of polypropylene homopolymer (PPH) increased from 19.1 to 103.2 kJ/m2. Crystallinity of β in PPH/polypropylene block copolymer (PPB) growed to 26.8%. Low temperature toughness of PPH increased by about two times. The t1/2 of 70PPH/30PPB/0.2β was 14.5 min shorter than 70PPH/30PPB at 140 °C.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2017
·
IF 2.464
Jing Cao,Na Wen,Yuying Zheng
Ca-montmorillonite (Ca-MMT) was first modified with different amount of two different kinds of surfactants to obtain organo-montmorillonites (OMMTs) directly via ion exchange between Ca 2+ and alkyl ammonium cations. Then remained Ca 2+ in OMMTs was reacted with pimelic acid (HA) to obtain CaHA-OMMTs. PP/CaHA-OMMT composites were prepared. Results of FT-IR demonstrate the existence of long-chain alkyl in OMMTs, and CaHA in CaHA-OMMTs. The reaction between HA and OMMT could lead to an increase in d-spacing value of clay. CaHA-OMMTs with high CaHA contents and obviously increased d-spacing values were obtained. Results of WAXD and TEM show exfoliated clay platelets in PP/CaHA-OMMT composites. The obviously increased T c , and the high β-phase content in PP/CaHA-OMMT composites demonstrate the high β-nucleation efficiency of CaHA-OMMTs. Composites with higher content of β-phase epitaxial crystallized on exfoliated clay platelets display largely improved impact strength .
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 12
·1-12
·
IF 3.097
Li Hui,Zhang Yue-Fei,Li Yan,Zhong Jinrong
This study reported a series of esterified lignin metal salts (EL-M, M = Na, Mg, Ca, Ba, Zn) derived from lignin as nucleating agents, which were used in isotactic polypropylene (iPP). The crystallization and melting behavior and mechanical properties of iPP/EL-M composites were studied. The results of differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) revealed that the crystallization temperature of iPP/EL-M composites increased by 5 to 8 °C compared with that of pure iPP. Simultaneously, EL-Zn, EL-Ba and EL-Ca all had strong β -crystal induction ability to iPP. Especially, when the addition amount of EL-Zn in iPP was 0.20 wt%, the relative β -content of iPP/EL-Zn reached up to 0.9277, and it was basically not affected by the cooling rate, indicating that EL-Zn was extremely active, selective and stable for iPP. For the vantage, the results of mechanical properties and SEM revealed that EL-Zn, EL-Ba or EL-Ca could improve the toughness of iPP to a certain extent.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 58
·期 14
·2022-2031
·
IF 0
Jianpeng Fang,Yue Cheng,Ling Zhang,Chunzhong Li
The interfacial interaction between glass fibers (GFs) and polypropylene (PP) resin is the key factor which affects the properties of GFs reinforced PP composites. The β-transcrystallization (β-TC) structure induced by β-nucleating agent (β-NA) at the interface is beneficial to improving the interfacial performance and comprehensive mechanical properties. However, due to the poor adhesive ability, it is difficult to introduce β-NAs onto GFs surface directly. In this work, for solving above problem, the sodium carboxymethyl cellulose (CMC) and NH 2 functionalized multiwalled carbon nanotubes (CNTs) were used to construct the network structure on GFs (CMC-CNT-GF) through plenty of active groups. Furthermore, the zinc phthalate (ZnPht, β-NA) was synthesized and coated on GFs surface by hydrogen bonds interaction with CMC-CNT and physical anchoring effect (ZnPht@CMC-CNT-GF). Finally, the hybrid GFs reinforced PP composite (iPP/ZnPht@CMC-CNT-GF) was prepared, which exhibited enhanced tensile, flexural, and impact strength by 20.1, 9.3, and 33.3%, respectively when compared with the iPP/raw GF due to the formation of β-TC and improvement of interfacial adhesion. This study provides an effective strategy to introduce β-NAs on GFs with network structure for improving interfacial properties by inducing β-TC to enhance the strength and toughness of composite, which could be applied in other fiber/semicrystalline polymer systems. Graphical The interfacial interaction between glass fibers (GFs) and polypropylene (PP) is a key factor that affects the properties of the composites. In this work, to overcome the difficulty to introduce β-nucleating agents (β-NAs) onto GFs, the zinc phthalate (ZnPht) was coated on GFs surface via hydrogen bond interactions with carboxymethyl cellulose–carbon nanotube (CMC-CNT) and physical anchoring effect in CMC-CNT-GF. The iPP/ZnPht@CMC-CNT-GF has increased strength and toughness. This study provides an effective strategy to introduce β-NAs on GFs with a network for improving interfacial properties.
研究领域:
材料科学
·
聚合物工程
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）