碳化淀粉包覆改性白炭黑/乳聚丁苯橡胶复合材料的性能

用淀粉糊对白炭黑进行改性得到碳化淀粉包覆改性白炭黑,将其填充乳聚丁苯橡胶(SBR),制得改性白炭黑/SBR复合材料,考察了淀粉含量对SBR混炼胶硫化特性、白炭黑在橡胶中的分散性及复合材料物理机械性能、耐磨性能、抗湿滑性、滚动阻力的影响。结果表明,随着淀粉含量的增加,SBR混炼胶的加工性能提高,白炭黑在橡胶中的分散性能得到改善,耐磨性能下降,抗湿滑性能基本不变; 当淀粉质量分数为5.0%时,改性白炭黑/SBR复合材料的物理机械性能最佳; 当淀粉质量分数为10.0%时,复合材料在应变小于10%时的滚动阻力高于未改性白炭黑/SBR复合材料。     

低滚动阻力全钢载重子午线轮胎胎面胶配方的研究

研究低滚动阻力全钢载重子午线轮胎胎面胶的配方和性能。结果表明：主体材料采用天然橡胶（NR）/顺丁橡胶（BR）/溶聚丁苯橡胶（SSBR）并用,减小炭黑用量,增大高分散性白炭黑用量,胎面胶的混炼工艺和挤出工艺性能优良,耐磨性能明显提高,生热明显降低,抗湿滑性能提高,滚动阻力大幅下降;成品轮胎的耐久性能提升,滚动阻力降低。     

电泳沉积母胶法碳纳米管/天然橡胶 复合材料的性能研究

用氢氧化钠和过氧化氢改性碳纳米管（CNTs）得到氧化CNTs(OCNTs),再用硅烷偶联剂KH-550改性OCNTs得到氮掺杂CNTs(NCNTs)。采用电泳沉积法制备CNTs/天然橡胶（NR）、OCNTs/NR和NCNTs/NR母胶后,再用机械共混法制得CNTs/NR复合材料,将其与直接采用机械共混法制得的CNTs/NR复合材料进行性能对比。结果表明：电泳沉积法能够使CNTs在NR中均匀分散,提高CNTs/NR复合材料的热稳定性;OCNTs/NR复合材料的300%定伸应力和拉伸强度最大,热稳定性最好,但生热和滚动阻力较高;NCNTs/NR复合材料的300%定伸应力和拉伸强度较大,抗湿滑性能最好,生热和滚动阻力最低,综合性能最好。     

环氧化天然橡胶改性淀粉/天然橡胶复合材料性能的研究

采用环氧化度适中的环氧化天然橡胶(ENR-25)改性淀粉/NR复合材料,并对其性能进行研究。结果表明:添加ENR-25可以显著提高改性淀粉/NR复合材料的物理性能和耐磨性能,降低淀粉/NR复合材料作为胎面胶时的滚动阻力,改善抗湿滑性能;当ENR-25用量为5份时,复合材料的综合性能较好。     

偶联剂和离子液体改性白炭黑补强天然橡胶性能的研究

研究偶联剂(Si69和B-69)与离子液体溴化1-丁基-3-甲基咪唑(BMIM)单用和并用改性白炭黑补强天然橡胶(NR)的性能。结果表明:与未改性白炭黑补强NR胶料相比,偶联剂Si69、偶联剂B-69和BMIM改性白炭黑补强NR胶料的硫化速率加快,Payne效应减弱,物理性能和耐磨性能提高,滚动阻力降低,偶联剂Si69改性白炭黑的效果优于偶联剂B-69;与偶联剂单用改性白炭黑补强NR胶料相比,偶联剂/BMIM并用改性白炭黑补强NR胶料的硫化速率加快,白炭黑与NR相互作用增强,交联密度增大,物理性能和耐磨性能显著提高,滚动阻力降低,偶联剂B-69/BMIM并用改性白炭黑补强NR胶料的滚动阻力小于偶联剂Si69/BMIM并用改性白炭黑补强NR胶料,抗湿滑性能相差不大;BMIM改性白炭黑补强NR胶料的综合性能最佳。     

Si747原位改性单分散白炭黑补强天然橡胶的性能研究

采用Si747在液相体系中对自制单分散白炭黑表面进行改性,利用乳液共混技术制备了天然橡胶(NR)复合材料,并通过橡胶加工分析、动态力学分析、透射电镜等测试手段对复合材料的结构与性能进行表征。结果表明,与未改性白炭黑相比,改性单分散白炭黑所得胶料的焦烧时间和工艺正硫化时间均缩短,促进了橡胶的硫化;改性单分散白炭黑/NR硫化胶的拉伸、撕裂强度增大,回弹性和耐磨性增加,压缩生热降低;改性前后,大粒径白炭黑复合材料Payne效应均较低;改性小粒径白炭黑抗湿滑性不如改性大粒径白炭黑/NR硫化胶,但滚动阻力表现更优。     

环氧化天然橡胶复合材料性能研究

采用新方法制备环氧化天然橡胶(ENR)/白炭黑和天然橡胶(NR)/ENR/白炭黑复合材料,并对其性能进行研究。结果表明:ENR/白炭黑复合材料的热稳定性优于ENR;在NR/ENR并用胶中加入白炭黑和硅烷偶联剂KH-550,NR/ENR/白炭黑复合材料0℃时的损耗因子(tanδ)增大,65℃时的tanδ值减小,复合材料的抗湿滑性能提高,滚动阻力减小。     

环氧化溶聚丁苯橡胶用作大分子偶联剂改性白炭黑/顺丁橡胶复合材料的性能研究

制备环氧度为15%的环氧化溶聚丁苯橡胶（ESSBR）,以其作为大分子偶联剂对白炭黑/顺丁橡胶（BR）复合材料进行改性,研究白炭黑/ESSBR/BR复合材料的性能,并与偶联剂Si69/白炭黑/溶聚丁苯橡胶（SSBR）/BR复合材料进行对比。结果表明,白炭黑/ESSBR/BR复合材料的白炭黑分散性、拉伸性能、抗湿滑性能和耐磨性能均有不同程度的提高,滚动阻力降低,且无挥发性有机化合物的排放,该复合材料可用于轮胎胎面胶。     

白炭黑对累托石/天然橡胶纳米复合材料结构与性能的影响

采用乳液法制备累托石(REC)/天然橡胶(NR)纳米复合材料,研究白炭黑对REC/NR复合材料结构和性能的影响。结果表明:白炭黑粒子可以插入累托石片层形成网络结构。加入少量白炭黑后,REC/NR复合材料的物理性能变化不大。随着白炭黑用量的增大,复合材料的抗湿滑性能、抗切割性能和耐磨性能提高,压缩生热逐渐增大,当白炭黑用量为15份时,复合材料的耐磨性能最好;当白炭黑用量为20份时,复合材料的抗切割性能和抗湿滑性能较好。     

高苯乙烯溶聚丁苯橡胶/高分散性白炭黑复合材料在电动汽车轮胎胎面胶中的应用对比

对比研究4种高苯乙烯溶聚丁苯橡胶（SSBR）/高分散性白炭黑复合材料在电动汽车轮胎胎面胶中的应用。结果表明：SSBR KC3737T/白炭黑9100GR复合材料的填料分散性最好;SSBR F3438K/白炭黑9100GR复合材料的耐磨和抗湿滑性能最好,滚动阻力最低,以此复合材料生产的轮胎的高速和耐久性能均满足国家标准要求,滚动阻力系数、通过噪声和抗湿滑指数分别达到了ECE R117法规的B,Ⅱ和B级。     

聚乙二醇400对水性复膜胶合成及性能的影响

将聚乙二醇(PEG)作为空间位阻型乳化剂、润湿剂和增塑剂引入到原水性干法复膜胶的反应体系中,讨论了PEG的相对分子质量(M_n)和用量对乳液的合成及使用性能的影响。结果表明:当w(PEG-400)=1.15%(相对于总单体而言)时,聚合反应的稳定性最佳,乳液的粘接性能和机械适应性明显提高。     

PEG-400 Partitioning in the HCCD/PEG Process for Cs and Sr Recovery

Abstract

The properties of the chloro-protected cobalt bis(dicarbollide) anion in the acidic form (HCCD), and in the presence of polyethylene glycol (PEG-400), are well known for the recovery of Cs and Sr from acidic radioactive streams. In the early development of HCCD/PEG extraction processes, questions were raised regarding the ability to control the concentration of PEG-400 in the organic phase due to its high solubility in the aqueous process solutions relative to HCCD or the diluent. The purpose of this study was to quantify the partitioning behavior of PEG-400 under a wide variety of relevant process conditions. PEG distribution ratios (D _PEG ) were measured by equilibrium batch contacts between the organic and aqueous phases over a wide range of conditions using radiometric techniques with ¹⁴C labeled PEG-400 to monitor the behavior of the bulk material. The results vary dramatically from 0.1 < D_PEG < 50, indicate that the PEG phase transfer kinetics are rapid, and that the aqueous phase nitric acid concentration has minimal impact on PEG solubility. The molar concentration ratio of [HCCD]:[PEG] in the organic phase has the greatest impact on PEG solubility. This ratio should be maintained at [HCCD]:[PEG] greater than or equal to approximately 6 to minimize PEG losses from the organic phase.     

竹材酚醇液化及其甲醛树脂的FT-IR分析

采用傅立叶红外光谱法分析了竹刨花在苯酚与聚乙二醇-400溶剂作用下酸催化液化产物的化学结构,以及液化物甲醛树脂的结构特征。分析表明:在液化过程中木质素、纤维素和半纤维素都发生了不同程度的降解,产生了很多的小分子物质;并且同时加入两种液化试剂,可以使竹刨花发生两种不同的液化反应。     

Simple and efficient CuI/PEG-400 system for hydroxylation of aryl halides with potassium hydroxide

This work reports a simple and efficient CuI/PEG-400 system for hydroxylation of aryl halides with potassium hydroxide. This protocol offers a direct transformation of aryl iodides or bromides to substituted phenols in great diversity. A very wide variety of functional groups are tolerated on aryl halides partners such as carboxyl, aldehyde and hydroxyl group.     

PEG-400促进的硝酸铈铵氧化安息香合成二苯基乙二酮

PEG-400作为绿色反应溶剂能有效地促进硝酸铈铵氧化安息香为二苯基乙二酮。产物结构用IR和1H NMR光谱对其进行了表征。该方法具有反应时间短,产率较高,操作简便,环境友好等优点。     

Microporous polyvinylidene fluoride hollow fiber membrane contactors for CO2 stripping: Effect of PEG-400 in spinning dope

In order to develop the structure of microporous PVDF membranes, PEG-400 was introduced into the polymer dope as a non-solvent additive. The hollow fiber membranes were prepared via a wet phase-inversion process and then used in the membrane contactor modules for CO₂ stripping from water. By addition of different amounts of PEG-400, cloud points of the polymer dope were obtained to examine phase-inversion behavior. From FESEM analysis, the membrane structure changed from a finger-like to an approximately sponge-like morphology with the addition of 4 wt.% of PEG-400. The prepared membranes presented smaller mean pore size (0.13 μm) and significantly higher wetting pressure (550 kPa) compared to the plain membrane. From CO₂ stripping test, at water velocity of 0.4 m/s, the PVDF membranes prepared by 4% PEG-400 demonstrated an approximate CO₂ stripping flux of 4.5 × 10⁻⁵ (mol/m² s) which is 125% higher than the flux of the plain membrane. It could be concluded that structurally developed hydrophobic PVDF hollow fiber membranes can be prepared by a controlled phase-inversion process to enhance the performance of gas–liquid membrane contactor.     

聚乙二醇(200)双甲基丙烯酸酯的合成

以PEG-200和甲基丙烯酸为主要原料,同时加入阻聚添加剂FA03,合成PEG-200双甲基丙烯酸酯。通过正交实验考察了原料配比、催化剂用量、阻聚剂用量、反应时间等因素对产率的影响,最佳工艺条件为PEG- 200与甲基丙烯酸摩尔比为1:2．1;催化剂对甲苯磺酸用量为醇酸总质量的2％;阻聚剂FY51用量为甲基丙烯酸质量的0．2％;反应时间为5 h;阻聚添加剂FA03用量为醇酸总质量的0．2％。最终产品酸值小于0．5 mg KOH／ g,w(固体分)>98％(105℃,20 min),产率大于82％。     

Synthesis of 2-Organylchalcogenopheno[2,3-b]pyridines from Elemental Chalcogen and NaBH4/PEG-400 as a Reducing System: Antioxidant and Antinociceptive Properties

An alternative method to prepare 2-organylchalcogenopheno[2,3-b]pyridines was developed by the insertion of chalcogen species (selenium, sulfur or tellurium), generated in situ, into 2-chloro-3-(organylethynyl)pyridines by using the NaBH₄/PEG-400 reducing system, followed by an intramolecular cyclization. It was possible to obtain a series of compounds with up to 93 % yield in short reaction times. Among the synthesized products, 2-organyltelluropheno[2,3-b]pyridines have not been described in the literature so far. Moreover, the compounds 2-phenylthieno[2,3-b]pyridine ( 3 b ) and 2-phenyltelluropheno[2,3-b]pyridine ( 3 c ) exhibited significant antioxidant potential in different in vitro assays. Further studies demonstrated that compound 3 b exerted an antinociceptive effect in acute inflammatory and non-inflammatory pain models, thus indicating the involvement of the central and peripheral nervous systems on its pharmacological action. More specifically, our results suggest that the intrinsic antioxidant property of compound 3 b might contribute to attenuating the nociception and inflammatory process on local injury induced by complete Freund's adjuvant (CFA).