粘接发泡材料的聚氨酯胶粘剂

江苏工业学院与常州合成化学总厂联合推出双组分无溶剂聚氨酯界面粘接胶粘剂PUA-11,可微发泡,具有一定膨胀性,因不含溶剂,故不会导致被粘发泡材料的性能变化。PUA-11胶对多数金属和非金属材料粘接性能良好,固化时间可调节,1d后粘接强度可达80％。PUA-11胶非常适宜聚氨酯（PU）和发泡聚苯乙烯（EPS）等轻质建筑发泡保温材料与混凝土、石板、木材、陶瓷、金属等建材的界面粘接,牢固可靠。     

HFC-245fa聚氨酯硬泡的粘接性能研究

通过合成新型聚醚多元醇 ,对交联剂和催化剂的选择等试验 ,有效地改善了HFC 2 45fa聚氨酯硬泡的粘接性能 ,满足了冰箱冰柜生产对聚氨酯硬泡粘接强度的要求。研制生产的HFC 2 45fa组合聚醚发泡特性及发泡制品的性能均达到了CFC— 11型同类产品水平。     

发泡型单组分聚氨酯胶粘剂的固化过程与动态力学性能的研究

发泡型单组分聚氨酯胶粘剂是由多元醇与多异氰酸酯合成的,用水固化。本工作的单组分胶粘剂的特点是室温固化、无溶剂,低粘度、发泡性好、粘接强度高。主要是为了满足引进自动生产线的工艺要求而研制的,用于粘接PVC贴塑钢板与岩棉,是船舶和舰艇建     

热熔胶膜在发泡PVC/铝热熔胶膜在发泡PVC/铝复合板材中的粘接可靠性研究性研究

以鹿山热熔胶膜VM2008为胶粘剂,制备了铝/PVC发泡节能复合板材(AEP),通过对不同复合工艺制备的复合结构粘接强度的测试确定热熔胶膜VM2008的最佳复合工艺,研究了复合结构的粘接可靠性包括耐温差性能、耐热老化性能、耐水煮性能、耐高温高湿性能以及耐紫外老化性能。结果表明,该热熔胶膜在160℃、0.4MPa、10s工艺条件复合时能形成良好的粘接强度,使用该胶膜制备的复合结构具有良好的耐温差性能、耐热老化性能、耐水煮性能、耐高温高湿性能以及耐紫外老化性能,能够很好的适用于铝/PVC发泡节能复合板的粘接。     

运动鞋中底用高弹性聚丙烯发泡材料的研制

以共聚聚丙烯(PP)树脂为主要原料,通过热塑性弹性体、多官能团助剂改性,获得可模压交联发泡PP材料。以带极性基团的改性烯烃类树脂提高粘接性能;通过调节聚烯烃弹性体、发泡剂、交联剂用量制得不同发泡倍率和力学性能的PP发泡材料,工业化生产出适合运动鞋中底的高弹性发泡材料。     

超临界二氧化碳/乙醇共发泡制备聚砜泡沫制品

以超临界二氧化碳(scCO_2)和乙醇为共发泡剂,通过釜压发泡的方法制备特种工程塑料聚砜(PSU)珠粒泡沫制品。研究了乙醇含量、发泡温度、饱和压力对PSU泡沫材料的泡孔结构和珠粒粘接的影响,阐明了共溶剂发泡与泡沫材料泡孔结构的关系。结果表明,乙醇的引入增加了scCO_2在PSU基体中的溶解度,降低了PSU的发泡温度(最低发泡温度为150℃),拓宽了PSU的发泡温度窗口,增大了泡孔尺寸和膨胀倍率。当乙醇含量为33. 9%,发泡温度为180℃,饱和压力为8 MPa时,PSU珠粒泡沫的平均孔径可达86. 0μm,膨胀倍率可达10. 9倍,泡孔密度为9. 4×10~5个/cm~3,其泡沫制品珠粒间粘接良好,力学性能优良,压缩强度可达7. 2 MPa。     

室温快固型发泡胶粘剂的研究

以环氧树脂和丙烯酸为基本原料,合成环氧丙烯酸酯,采取氧化还原引发方式,用环氧丙烯酸酯及其它活性单体和添加剂制备出一种室温快固型发泡胶粘剂;考虑了发泡剂用量、泡沫稳定剂种类及用量对发泡倍率和粘接强度的影响。     

改性氰酸酯发泡胶膜的制备与性能

采用环氧树脂和热塑性树脂改性氰酸酯树脂的方法,研制了改性氰酸酯发泡胶膜。用示差扫描量热法研究了发泡胶膜的固化特性。研制的发泡胶膜具有良好自粘性,室温贮存期为20d。180℃固化后,膨胀比在1．5—3．5之间,200℃管剪强度大于4MPa。试验结果表明,该发泡胶膜能满足高性能雷达天线罩结构粘接要求。     

低发泡塑料鞋跟的研制

以聚丙烯及偶氮二甲酰胺(AC发泡剂)为主要原料,用注塑成型方法生产一种低发泡塑料鞋跟。着重介绍了低发泡鞋跟注塑成型模具的设计、注塑成型工艺条件及产品的性能。结果表明,所生产的聚丙烯低发泡塑料鞋跟不但具有质轻、容易钉钉、铁钉固定强度好、磨耗量小、与皮革的粘接性佳等优良性能,而且成本较低,每只鞋跟的费用比不发泡的塑料鞋跟少,0.133元     

全水发泡硬质聚氨酯泡沫塑料的研制

研制了低粘度的聚醚PE600系列和具有良好流动性的全水发泡硬质聚氨酯泡沫塑料组合聚醚。对制备中影响发泡性能的有关因素进行了探讨。依此制备的硬质聚氨酯泡沫塑料具有良好的尺寸稳定性、优异的粘接性能和较低的导热系数，已达到或超过汽车、建筑行业对全氟泡沫的要求，具有广阔的市场前景。     

用黑曜岩泡沫玻璃作紫贻贝附着基的研究

黑曜岩泡沫玻璃配合料由黑曜岩废料、玻璃粉和发泡剂组成。黑曜岩泡沫玻璃用作海水中养殖紫贻贝的附着基。紫贻贝在黑曜岩泡沫玻璃的附着比其他附着基牢固。     

Investigations on the adhesion and interfacial properties of polyurethane foam/thermoplastic materials

The adhesion and interfacial properties of polyurethane (PU) foams with thermoplastic (TP) materials were investigated using different techniques. The adhesion performance of PU foam with TP materials was evaluated using the peel test method, and the adhesion durability was checked after different climate treatments. X‐ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and contact angle measurements were used to study the surface and interface morphology of PU foam and TP material system. Three types of PU foam samples which differ in their composition and also five commercially available TP blends systems, based on poly(carbonate), poly(styrene‐co‐maleic anhydride), poly(acrylonitrile‐butadiene‐styrene), and silicone acrylate rubber have been used. The slow reacting foam shows the best adhesion properties with all the TP materials. The climate treatments strongly effected the PU foam adhesion durability with poly(carbonate) containing TP materials (70–80% loss in adhesion), but nearly no effect with poly(styrene‐co‐maleic anhydride). The samples with lowered adhesion could be separated by peeling without visible foam residues on the TP surface. AFM, XPS, and surface tension studies have shown that the surface properties of the TP material are still governed by the PU foam. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 479–488, 2007     

Foaming biocompatible and biodegradable PBAT/PLGA as fallopian tube stent using supercritical carbon dioxide

Tubal pregnancy is a common abnormal pregnancy manifestation, and the ordinary conservative treatment of tubal adhesion usually leads to the rupture of fallopian tube, which increases the risk of a second ectopic pregnancy. To avoid this symptom, it is suitable to implant a stent to separate the adhesion. Here we prepared the PBAT/PLGA foam as the stent material using supercritical CO₂ foaming technology. With uniform macroporous structure and thin-wall feature, the foam possessed low...     

EVA/EPDM/IR/IR共混发泡材料的性能研究

研究了乙烯醋酸乙烯酯共聚物（ＥＶＡ）／ＥＰＤＭ／ＩＲ三元共混和ＥＶＡ／ＥＰＤＭ／ＩＲ／ＩＲ四元共混发泡材料的性能。在ＥＶＡ中混入ＥＰＤＭ可使发泡材料的拉伸强度、撕裂强度和粘合强度提高,而收缩率和压缩永久变形降低;在ＥＶＡ中混入ＩＲ除具备混入ＥＰＤＭ同样的优点外,还可提高发泡材料的柔性;ＩＲ的混入可改善发泡材料二次热压成型制品的表面清晰度。     

A study on the anchoring orientations of foam and sandwich composites with metal

Metallic anchors are used as the load transfer components for foam and sandwich composites when they are used as structural elements in design applications. The traditional method of fixation of these components is by gluing and fastening. The anchors are in the form of inserts and are imbedded in the foam during the foaming process. In this study, flexural testing was conducted on different metal anchor/foam configurations to establish typical interaction trends. The load‐deflection response, mode of failure, and fracture stresses of the structures were elucidated. Tests were conducted on foam and sandwich composites having rectangular, cylindrical, and taper geometries with different lengths. Leaf inserts were designed, manufactured, and tested inside foam and sandwich composites. Comparisons between the taper and leaf inserts are presented. Leaf inserts had better results compared with taper inserts in terms of adhesion and failure stresses. Finite element analysis (FEA) of the interactions between the inserts and the foam and sandwich composites under different loads was carried out. The FEA modeling results were very similar to the experimental results, thus validating the model. Simulations were also run with foam and sandwich composites with closeout configuration. Foam–sandwich with inserts had better adhesion and load‐bearing properties compared with same structures with closeouts. POLYM. COMPOS., 2011. © 2011 Society of Plastics Engineers     

Control of growth and inflammatory response of macrophages and foam cells with nanotopography

ABSTRACT: Macrophages play an important role in modulating the immune function of the human body, while foam cells differentiated from macrophages with subsequent fatty streak formation play a key role in atherosclerosis. We hypothesized that nanotopography modulates the behavior and function of macrophages and foam cells without bioactive agent. In the present study, nanodot arrays ranging from 10 to 200 nm were used to evaluate the growth and function of macrophages and foam cells. In the quantitative analysis, the cell adhesion area in macrophages increased with 10- to 50-nm nanodot arrays compared to the flat surface, while it decreased with 100- and 200-nm nanodot arrays. A similar trend of adhesion was observed in foam cells. Immunostaining, specific to vinculin and actin filaments, indicated that a 50-nm surface promoted cell adhesion and cytoskeleton organization. On the contrary, 200-nm surfaces hindered cell adhesion and cytoskeleton organization. Further, based on quantitative real-time polymerase chain reaction data, expression of inflammatory genes was upregulated for the 100- and 200-nm surfaces in macrophages and foam cells. This suggests that nanodots of 100 and 200 nm triggered immune inflammatory stress response. In summary, nanotopography controls cell morphology, adhesions, and proliferation. By adjusting the nanodot diameter, we could modulate the growth and expression of function-related genes in the macrophages and foam cell system. The nanotopography-mediated control of cell growth and morphology provides potential insight for designing cardiovascular implants.     

Peel strength improvement of foam core sandwich beams by epoxy resin impregnation on the foam surface

The interfacial adhesion characteristics between foam cores and faces affect much the structural integrity of foam core sandwich structures. The peel strength between the face plate and the foam core is one of the appropriate parameters for the interfacial characteristics of sandwich structures and its peel energy is also measured for the interfacial characterization. The peel strength is the first peak force per unit width of bondline required to produce progressive separation, and the peel energy is the amount of energy per unit bonding area associated with a crack opening. In this study, to improve the peel strength between the foam core and the face plate of foam core sandwich beams, the surfaces of foam core sandwich beams were resin-impregnated. Then the peel strength as well as peel energy of resin impregnated polyurethane foam core sandwich beams were measured by the cleavage peel test and compared with those of the same sandwich beams without surface resin impregnation on the foam surface.     

Functionally graded dry adhesives based on f ilm-terminated silicone foam

A dry functionally graded adhesive (FGA) based on f ilm-terminated silicone foam was developed utilizing the foam's capacity of absorbing a large amount of energy to deliver high adhesion. The fabrication technique is based simply on sugar cube templating of common elastomers followed by film termination of the elastomer cubes using the same material. Dependences of the pull-off adhesive force and energy release rate on the preload and foam thickness were systematically investigated through a series of axisymmetric indentation/de-bonding tests. The contribution of the foam backing layer to the overall compliance and adhesion was analysed and discussed. The developed elastic f ilm-terminated structure has remarkable enhancement in pull-off force and work of adhesion, which can be employed in the transport of delicate objects as demonstrated in the pick and place of a silicon wafer. Furthermore, the proposed foam-based FGAs can be readily detached from the adherent surface by applying a slight shearing deformation. The research findings provide insights in understanding the role of mechanical graded properties in adhesion and can have technical implications in the development of a simple but effective dry adhesive material for mounting and transporting objects by automated robotic devices.     

泡沫材料对风电叶片夹层结构结合性能的影响

讨论了目前用在风力发电叶片中的交联聚氯乙烯(PVC)、苯乙烯-丙烯腈(SAN)、聚苯乙烯(PS)和聚对苯二甲酸乙二醇酯(PET)4种泡沫芯材。通过扫描电子显微镜(SEM)对泡沫芯材的微观形貌进行观察,并通过泡沫对树脂吸收量分析了每种泡沫的孔径和孔容积以及泡沫与树脂的粘接面积。研究了每种泡沫的机械性能,通过泡沫对玻璃钢的抗剥离性能测试直观考察每种泡沫与玻璃钢的结合性能。结果显示具有小泡孔和高机械性能的泡沫在与玻璃钢结合时表现出更好的抗剥离性能。