常用纺织浆料的粘附性比较和因素分析

用粗纱法测定了酸解淀粉、PVA1799、丙烯酸浆和聚酯浆料这四种常用浆料对纯棉和涤/棉的粘附力.在对实验数据分析的基础上指出纤维强度也是粗纱法粘附性的重要影响因素,分别分析了粗纱本身强力、浆膜强度和纤维强度对粘附性的影响,并进行了相互比较.     

溶剂型丙烯酸酯压敏胶基质对贴片黏附性的影响

考察了不同的丙烯酸酯压敏胶(PSA)型号、溶剂系统组成及含量、高分子添加剂类型及含量等对PSA基质黏附性的影响。通过测定180°剥离强度和持粘力探讨了干燥条件对基质黏附性的影响,并对各因素进行优化筛选。结果表明:Duro-Tak87-2677的180°剥离强度为0.88kN/m,持粘力为50h,适合作为丙烯酸酯PSA的基质;当组合溶剂中V(异丙醇)∶V(正庚烷)∶V(乙酸乙酯)=37∶37∶21、m(水)∶m(乙醇)∶m(组合溶剂)=10∶7∶(67～70)时,PSA基质的溶剂系统为均一体系;当w(RLPO)=5%、干燥温度为80℃和干燥时间为15min时,丙烯酸酯PSA基质的180°剥离强度为0.1～0.6kN/m,持粘力9h,黏附性较好。     

纸塑复膜胶粘接性的影响因素及改善粘接性的对策

通过各组分用量对纸塑复膜胶粘接力影响的讨论,提出了改良粘接性方面的对策.     

丹参酚酸盐在健康志愿者的药代动力学和药效学研究

目的: 研究丹参酚酸盐在健康人体的药代动力学,以及血药浓度与血小板粘附性和聚集率的关系。方法: 9名健康志愿者根据交叉设计,静脉滴注丹参酚酸盐200、300、400 mg,用药后不同时间采血样,用高效液相色谱法测定丹参酚酸盐血药浓度;玻球法测定血小板粘附率;比浊法测定血小板聚集率。结果: 丹参酚酸盐药动学代谢呈二室模型,消除半衰期约lh,表观分布容积较大,提示为全身分布,峰浓度约为14 mg·L^-1。血小板粘附率在用药后呈波动性下降,5 h(即用药后4 h)药效渐渐消失,可见一个药效滞后环,在停药后3 h、血药浓度在1.91 mg·L^-1时药效达峰值。血小板粘附率在静滴药物期间与药浓相关,药效峰值与药浓岭值吻合,也呈现药效滞后环。结论: 丹参酚酸盐在健康人体消除快,对血小板聚集率和粘附率均有降低作用,前者达峰时间在滴注给药末,后者在停滴后3 h,均呈现较好的滞后效应。     

丙烯酸改性氯化聚丙烯的合成和粘接性能的研究

氯化聚丙烯是聚丙烯的氯化改性产物，通过改性，其硬度、耐磨性、耐酸性、耐盐水性能比聚丙烯都好，耐热、耐老化性也优于聚丙烯。但其性能尤其是粘接性能还不能满足其在胶粘刺等方面的需要，为了进一步提高氯化聚丙烯的粘接性能，拓宽其应用领域，需对氯化聚丙烯改性。接枝共聚法是一种很好的化学改性方法。本文以丙烯酸(AA)作为接枝单体，以过氧化苯甲酰(BPO)为引发剂，以甲苯为溶刺，采用液相接枝共聚法，将丙烯酸单体接枝到氯化聚丙烯大分子链上，得到丙烯酸改性氯化聚丙烯产物。系统研究了反应温度、反应时间、引发剂过氧化苯甲酰用量和丙烯酸单体用量等因素对丙烯酸接枝改性的氯化聚丙烯产物粘接性能的影响，得出了较佳的工艺条件是反应温度T=100℃，反应时间t=3．5h，原料质量配比为100份氯化聚丙烯、3份丙烯酸和0．3份的过氧化二苯甲酰。研究还表明，丙烯酸改性的氯化聚丙烯的粘接性能优于氯化聚丙烯的粘接性能。     

Grafting of glycidyl methylacrylate onto chlorinated polypropylene and its bonding to aluminum flake

Glycidyl methacrylate (GMA) was grafted onto chlorinated polypropylene (CPP) in the molten state using benzoyl peroxide (BPO) in the presence of styrene (St) as a comonomer. The differential scanning calorimetry (DSC) results indicated that the thermodynamic curve of unpurified grafted CPP was different from the purified, and showed a new broad endothermic peak at 100°C, which may be attributed to the glass transition temperature (T_g) of remained copolymer of GMA and St. Furthermore, transmission electron microscope (TEM) showed that there were two‐phase structures in the grafted CPP. Because the grafted CPP was to be used as a hot melt adhesive, so the influence of initiator concentration, monomer concentration, and reaction temperature on peel strength was investigated. The experiment results showed that a higher degree of grafting was obtained by using two kinds of monomers, such as GMA and St. Increasing the monomer concentration led to an initial rapid increase in the peel strength. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 2515–2521, 2007     

Properties of bismaleimide resin modified with polyrotaxane as a stress relaxation material

In this study, 4,4′‐diphenylmethane bismaleimide (BMI)/2,2′‐diallylbisphenol A (DABPA) resin was modified with polyrotaxane (PR) as a stress relaxation material. Based on a dynamic mechanical analysis and various properties of the cured resin, the influence of the motion of PR on the cured properties of BMI/DABPA/PR alloy is discussed. The cyclic molecule α‐cyclodextrin (α‐CD) that is threaded onto the PR axis contains a methacryl group in its side chain that reacts with the allyl group of BMI/DABPA resin. The methacryl group of PR reacted with the allyl group of BMI/DABPA matrix resin to form a transparent and dense network structure, so that the glass transition temperature was increased with increasing PR concentration. In addition, the toughness, impact resistance and adhesiveness of BMI/DABPA resin were improved by modification with PR. These results indicate that the poly(ethylene glycol) chain, which is the axial polymer of the PR, moves in the space formed by the cavities of the threaded α‐CD and the surrounding BMI/DABPA resin matrix in the glassy state, thereby relaxing the internal stress applied to BMI/DABPA/PR resin. The range of applications of BMI/DABPA resin modified with PR may expand into fields requiring high heat resistance in addition to excellent toughness and adhesiveness. © 2018 Society of Chemical Industry     

热空气老化对芳纶/橡胶复合体系粘合性的影响研究

研究了热空气老化对芳纶／橡胶复合体系粘合性的影响，通过对H抽出力一位移曲线特征值分析考察，发现芳纶经一定条件的空气等离子体处理再结合浸胶处理，与橡胶形成的粘合体系有较好的耐热空气老化能力和抵抗粘合破坏的能力，综合性能良好。     

糖酵解途径相关基因与植物乳杆菌生理行为的相关性

研究pgm、fba、gap过表达对植物乳杆菌（Lactobacillus plantarum）LR-1的抗逆性、黏附和生物被膜形成的影响。结果表明，pgm、fba基因的过表达可提高植物乳杆菌LR-1的耐热性、耐酸性和抗胆盐性，这两个基因的过表达促进了该菌株生物被膜的形成和黏附。gap基因的转录水平对植物乳杆菌LR-1的抗逆性、生物被膜形成和黏附没有显著影响。pgm、fba、gap的上调提高了该菌株tuf、luxS的转录水平。这种增加在过表达pgm、fba的重组菌株中比在过表达gap的重组菌株中高。此外，生物信息学分析表明，pgm、fba可与多条途径相关的基因相关联。本研究揭示糖酵解途径相关基因在调节植物乳杆菌的抗逆性、黏附和生物被膜形成中的新作用。     

丙烯酸酯压敏胶基贴片制备工艺中的质量控制

以丙烯酸酯PSA(压敏胶)和乳癖消浸膏共混作为药用PSA基质,考察了载药量、过程水的加入量、环境湿度、存放时间和制备工艺等因素对PSA基质的黏附性、抗老化性能和药物释放度等影响。结果表明:药用PSA基质中,当w(中药浸膏)≈38%(相对于基质总量而言)、w(水)=8%～10%(相对于基质总量而言)且贴片密封保存时,压敏胶基质的抗老化性能得到明显提高,其180°剥离强度为0.1～0.6kN/m,持粘力超过6h,并保持良好的稳定性;以50r/min左右的搅拌速率制取的PSA基质,其贴片的芍药苷12h释放度为83.61%(相对于芍药苷总量而言);当贴片存放时间超过60d时,药物释放度基本趋于稳定。