A Facile Approach toward Thermoplastic Triple-Shape Memory Polymers

In this work, a ternary blend of polyolefin elastomer (POE), lauric acid (LA), and poly(ε-caprolactone) (PCL) with triple-shape memory effect (triple-SME) is reported. LA and PCL exhibit distinct thermal transitions and construct two reversible switching networks capable of fixing and releasing different temporary shapes under a mild condition. The ternary blend shows excellent triple-shape memory properties and good toughness. Besides, the permanent shape can be reconfigured by a simple thermal treatment. These particular features make the novel blend a competitive candidate for diverse applications. And the creative combination of crystalline small molecule and semicrystalline polymer expands the freedom for producing triple-shape memory polymers (triple-SMPs).     

Pressure Response through Valve for Continuous Oil-Water Separation Based on a Flexible Superhydrophobic/Superoleophilic Thermoplastic Vulcanizate Film

Highly efficient oil-water separation shows urgent demand in industrial applications, especially in oil-spill accidents and organic solvent separation. Herein, a novel method is proposed for continuous oil-water separation by a pressure response through valve, which is loaded in a flexible convolute superhydrophobic/superoleophilic film based on low-density polyethylene (LDPE)/ethylene-propylene-diene terpolymer (EPDM) thermoplastic vulcanizate (TPV). The superhydrophobic/superoleophilic LDPE/EPDM TPV film (with contact angles of oil and water are 0° and 161.9°± 2.2°) is prepared only via a molding process where sandpaper is used as the template. The superhydrophobic/superoleophilic property of the TPV film shows robust performance in the activity endurance test. More importantly, the flexible LDPE/EPDM TPV film can be easily rolled up and loaded in through valve, which is the pressure response channel in oil-water separation. The typical separation pressure of oil and water is 3.01 and 6.17 kPa, which means the oil can be completely separated from the oil-water mixture under proper pressure in the pressure response through valve.     

Thermoplastic Starch Nanocomposites Reinforced with Cellulose Nanocrystal Suspensions Containing Residual Salt from Neutralization

Sulfuric acid-catalyzed hydrolysis of cellulose commonly isolates cellulose nanocrystals (CNCs). Neutralizing the reactant solution with sodium hydroxide facilitates efficient downstream processing, but residual salt remains in the product. This study examines the reinforcing effects of CNCs from suspensions that contain residual salt on the mechanical properties of thermoplastic starch nanocomposites. By reinforcing starch films with up to 5 wt% CNCs, stiffness and strength are improved by 118% and 79%, respectively, indicating a good dispersion of CNCs in the starch matrix. Compared to nanocomposites incorporating salt-free CNCs, the remaining salt has no significant impact on the material's mechanical performance. The results indicate great potential of CNCs containing residual salt as biobased, low-cost nanofiller in hydrophilic polymer matrices.     

国内外ABS市场及应用概况

概述了ABS树脂在世界各区域及国家 (或地区 )的生产、供需及市场应用情况     

PP／mPE／无机填料三元复合材料的形态结构和力学性能

采用刚性无机填料对茂金属聚乙烯（mPE)弹性体增韧聚丙烯（PP）二元共混体系进行增强，从而制得PP／mPE无机填料三元复合材料。分别探讨了CaCO3用量对复合材料拉伸性能和低温冲击性能影响，并考察了不同填料的增强效果。实验结果表明，由于弹性体的存在，无机填料的增强作用减弱；共混物的低温冲击强度也因填料的加入而大幅度下降，但经过表面处理的高岭土体系的冲击强度反而提高。SEM断裂形貌显示，未经表面处理的填料和基体的界面结合较弱，而改性高岭土则以层状结构分散于基体中，并呈现牢固的界面结合。     

国内动态硫化技术产业化的探讨

根据国外动态硫化技术的发地趋势，结合国内科研情况．对ＴＰＶ推广应用的可能性进行了分析，并对今后的发展提出了建议。国内ＴＰＶ的主要应用市场是轿车及电线电缆行业。顶计２０００年，轿车行业对ＴＰＥ的需求量达３２５０ｔ／ａ。国内ＥＰＤＭ／ＰＰＴＰＶ工厂成本不超过１．７万元／ｔ．售价将远低于Ｓａｎｔｏｐｒｅｎｅ。     

热塑性聚氨酯弹性体加工成型技术及应用

研究和介绍热塑性聚氨酯弹性体原料的生产，制品的热加工成型过程。尤其对制品加工过程中材料准备、着色剂填加、回收料使用、注射模塑、挤出、压延、粘接及成品的后处理等作了较详细的论述。最后给出了挤出，注射两大主要成型制品在工业上的一些主要应用。     

大分子表面改性剂在聚合物表面的富集行为

简述了大分子表面改性剂添加到聚烯烃基体中时接触介质的诱导作用和聚烯烃基体结晶的异质排斥作用及其相对分子质量、链节的柔顺性和与基体的相容性对其表面富集的影响。提出大分子表面改性剂设计合成的基本原则:化学结构和使用环境相匹配、憎水基功能团和亲水基功能团相适应、使用效率和功能持久性相平衡。介绍了大分子表面改性剂合成的主要方法。     

聚氨酯/聚丙烯酸酯复合弹性体的力学性能研究

采用预聚体法合成了一系列聚氨酯／聚丙烯酸酯复合弹性体，研究了组成比例对PU／PA复合弹性体的力学性能的影响。结果表明：聚丙烯酸甲酯的比例在一定范围内时，可以较大程度地提高材料的力学强度和断裂伸长率，而将丙烯酸甲酯和甲基丙烯酸甲酯混合加入聚氨酯中，形成的复合弹性体的力学性能无明显改善。     

热塑性复合材料用混纤预浸料特征

本文对热塑性复合材料用预浸料的结构及其在复合材料成型加工中的浸渍性能进行分析.