NR硫化返原动力学及主要抗硫化返原助剂

对硫化返原的动力学、抗硫化返原助剂的作用机理、不同抗硫化返原助剂在不同的配合体系中的用量及对硫化胶性能的影响进行评述。对于抗硫化返原助剂,在半有效硫化体系中Ｓｉ６９抗返原性最好。在传统硫化体系中ＨＶＡ－２最好。实际应用时不同本的配方应采取相应的抗硫化还原剂。     

提高胶料抗硫化返原性的途径

介绍了国内外提高胶料抗硫化返原性的主要方法：高速生胶和硫化体系;添加芳香锌皂、专用抗硫化返原剂（如Ｐｅｒｋａｌｅｎｋ９００,ＭＣＩ－ＭＸ,ＨＶ－２,ＨＴＳ及ＤＬ－２６８等）和其它助剂（如硅烷联剂Ｓｉ６９等）。指出添加抗硫化返原剂是提高胶料抗硫化返原性的最有效方法,它可获得地好的的综合性能,并显著提高胶料的抗硫化返原性。     

抗硫化返原剂在纯天然橡胶复合体系中的应用研究

研究了抗硫化返原剂Perkalink900（简称PK900）、AK-73对纯天然橡胶复合体系的抗硫化返原性能、物理机械性能及生热性能的影响，结果表明：无论是在普通硫化体系还是在半有效硫化体系中，加入一定量PK900、AK-73后，胶料的抗硫化返原性能均得到提高。就这2种抗硫化返原剂而言，在不同的硫化体系中，在不同的温度下，表现的结果有所不同：在半有效硫化体系中，高温过硫情况下，PK900的作用更加明显，同时，加入一定量的抗硫化返原剂后，胶料的定负荷压缩生热性能得到一定程度的改善。     

提高工程机械轮胎抗硫化返原性的措施

分析橡胶的耐热性、胶料硫化返原的机理及影响因素，讨论提高工程机械轮胎抗硫化返原性的措施。指出选择合适的硫化体系、添加抗硫化返原剂、降低胶料生热、并用耐热胶种、调整轮胎不同部位胶料硫化速度的匹配性等，以及利用计算机数值模拟的方法确定合适硫化条件是提高工程机械轮胎抗硫化返原性的有效措施。     

不同硫化体系对NR抗硫化返原性的影响

研究了半有效硫化体系（SEV）、普通硫黄硫化体系（CV）、平衡硫化体系（EC）等对NR硫化特性、力学性能、交联密度的影响。结果表明：不同硫化体系硫化的NR胶料抗返原性从大到小顺序为EC〉SEV2〉SEV1〉CV。SEV2硫化胶力学性能优异,交联密度较大。SEV1和CV硫化胶在过硫化条件下力学性能降低显著。在不同硫化条件下,EC和SEV2硫化胶横向松弛时间t2变化较小,抗返原性较好;SEV1和CV硫化胶横向松弛时间t2变化较大,抗返原性较差。     

促进剂TE在天然橡胶大型厚制品胶料中的应用

对3种不同取代基的秋兰姆类促进剂在天然橡胶中的硫化特性及物理性能进行了比较。结果发现，不论在有效、半有效或普通硫化体系中，含促进剂TE的天然橡胶胶料均具有最长的焦烧时间和较好的抗硫化返原性。对物理机械性能和抗热氧老化性能亦无不良影响，适合于在天然橡胶大型厚制品胶料中应用。     

硫化体系对V形NR弹簧胶料抗硫化返原和抗蠕变性能的影响

探讨了硫化体系对V形NR弹簧胶料抗硫化返原和抗蠕变性能的影响。结果得出，助交联剂HVA—2可较好地提高胶料的抗硫化返原和抗蠕变性能；有效硫化体系胶料的抗硫化返原和抗蠕变性能优于普通硫化体系和半有效硫化体系胶料；有效硫化体系硫化的V形NR弹簧产品的抗蠕变性能明显优于普通硫化体系硫化的弹簧产品，且好于进口产品。     

抗硫化返原剂KA9188在绿色载重轮胎中的应用

研究抗硫化返原剂KA9188对绿色载重轮胎硫化胶抗硫化返原性、生热性能、耐磨性能和撕裂强度的影响。结果表明:KA9188用量不小于1.2份时,可以体现出抗硫化返原效果;KA9188可以有效地提高硫化胶的撕裂强度;在半有效硫化体系中,KA9188替代部分硫黄且硫化胶定伸应力适当降低时,硫化胶的耐磨性能大幅提高;在有效硫化体系中,采用少量KA9188替代部分硫黄可以降低硫化胶的压缩生热,提高耐磨性能。     

抗硫化返原剂WK901在全钢载重子午线轮胎中的应用

研究抗硫化返原剂WK901在全钢载重子午线轮胎上三角胶中的应用效果,并与抗硫化返原剂Perkalink 900(简称PK900)进行对比。结果表明,与PK900一样,加入WK901可明显提高胶料的抗硫化返原性。同时对胶料的加工安全性、硫化速率没有影响;两种抗硫化返原剂对硫化胶物理性能的影响基本相同;WK901用量在0．7份时胶料的综合性价比最优。     

NR硫化返原的研究 Ⅱ.半有效硫化体系

研究了半有效硫化体系硫化ＮＲ的返原反应,对双－（γ－三乙氧基硅烷基丙基）－四硫化物（Ｓｉ６９）抗返原作用的原因进行了分析,通过测定硫化曲线,物理性能和溶胀指数,考察常见的３种工业化抗返助剂（Ｓｉ６９,Ｎ,Ｎ′－间亚苯基双马来酰亚胺（ＨＶＡ－２）和环己烷二硫代硫酸盐二水合物（ＨＴＳ）对ＮＲ硫化返原反应的抑制效果,实验结果表明,抗返原助剂可改善了ＮＲ的热氧化性能Ｓｉ６９的抗返原效果最好,用量以３份为宜     

Dynamically cured polypropylene/epoxy blends

The dynamic vulcanization process, usually used for the preparation of thermoplastic elastomers, was used to prepare polypropylene (PP)/epoxy blends. The blends had crosslinked epoxy resin particles finely dispersed in the PP matrix, and they were called dynamically cured PP/epoxy blends. Maleic anhydride grafted polypropylene (MAH‐g‐PP) was used as a compatibilizer. The effects of the reactive compatibilization and dynamic cure were studied with rheometry, capillary rheometry, and scanning electron microscopy (SEM). The crystallization behavior and mechanical properties of PP/epoxy, PP/MAH‐g‐PP/epoxy, and dynamically cured PP/epoxy blends were also investigated. The increase in the torque at equilibrium for the PP/MAH‐g‐PP/epoxy blends indicated the reaction between maleic anhydride groups of MAH‐g‐PP and the epoxy resin. The torque at equilibrium of the dynamically cured PP/epoxy blends increased with increasing epoxy resin content. Capillary rheological measurements also showed that the addition of MAH‐g‐PP or an increasing epoxy resin content increased the viscosity of PP/epoxy blends. SEM micrographs indicated that the PP/epoxy blends compatibilized with PP/MAH‐g‐PP had finer domains and more obscure boundaries than the PP/epoxy blends. A shift of the crystallization peak to a higher temperature for all the PP/epoxy blends indicated that uncured and cured epoxy resin particles in the blends could act as effective nucleating agents. The spherulites of pure PP were larger than those of PP in the PP/epoxy, PP/MAH‐g‐PP/epoxy, and dynamically cured PP/epoxy blends, as measured by polarized optical microscopy. The dynamically cured PP/epoxy blends had better mechanical properties than the PP/epoxy and PP/MAH‐g‐PP/epoxy blends. With increasing epoxy resin content, the flexural modulus of all the blends increased significantly, and the impact strength and tensile strength increased slightly, whereas the elongation at break decreased dramatically. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1437–1448, 2004     

硫化体系的变更对白炭黑填充橡胶性能的影响

文章通过对白炭黑填充橡胶的硫化体系的变更,探讨了加入MBTS（苯并噻唑）对橡胶物性及轮胎性能的影响。结果表明,在白炭黑填充的橡胶中加入MBTS,大大提高硫化速率,缩短硫化时间,橡胶物理特性差异很小,轮胎评价达到试验要求。     

不饱和酸结构对不饱和聚酯树脂固化行为的影响

通过IR分析了用顺酐和反酸与聚酯合成不饱和聚酯树脂的反应机理,讨论了二种树脂体系固化放热曲线不同的原因。     

Study of dynamically cured PP/MAH‐g‐PP/talc/epoxy composites

In the present study, an epoxy resin was dynamically cured in a polypropylene (PP)/maleic anhydride–grafted PP (MAH‐g‐PP)/talc matrix to prepare dynamically cured PP/MAH‐g‐PP/talc/epoxy composites. An increase in the torque at equilibrium showed that epoxy resin in the PP/MAH‐g‐PP/talc composites had been cured by 2‐ethylene‐4‐methane‐imidazole. Scanning electron microscopy analysis showed that MAH‐g‐PP and an epoxy resin had effectively increased the interaction adhesion between PP and the talc in the PP/talc composites. Dynamic curing of the epoxy resin further increased the interaction adhesion. The dynamically cured PP/MAH‐g‐PP/talc/epoxy composites had higher crystallization peaks than did the PP/talc composites. Thermogravimetric analysis showed that the addition of MAH‐g‐PP and the epoxy resin into the PP/talc composites caused an obvious improvement in the thermal stability. The dynamically cured PP/MAH‐g‐PP/talc/epoxy composites had the best thermal stability of all the PP/talc composites. The PP/MAH‐g‐PP/talc/epoxy composites had better mechanical properties than did the PP/MAH‐g‐PP/talc composites, and the dynamically cured PP/MAH‐g‐PP/talc/epoxy composites had the best mechanical properties of all the PP/talc composites, which can be attributed to the better interaction adhesion between the PP and the talc. The suitable content of epoxy resin in the composites was about 5 wt %. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006     

Evolution of properties of an isocyanate/epoxy thermosetting system during cure: Continuous heating (CHT) and isothermal time—temperature—transformation (TTT) cure diagrams

The present article describes a methodology for examining the evolution of the properties vs. cure of a complex thermosetting isocyanate/epoxy reactive mixture which reacts through two consecutive but separable reaction regimes. The methodology is based on the use of the torsional braid analysis (TBA) technique and the continuous heating (CHT) and isothermal time—temperature—transformation (TTT) cure diagrams. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 15–25, 1997     

Effect of polyaniline surface modification of carbon nanofibers on cure kinetics of epoxy resin

Polyaniline (PANI) “nanograss” was grown on carbon nanofibers (CNFs). The cure behavior of an epoxy resin with and without unmodified CNFs or PANI modified CNFs was studied by means of non‐isothermal and isothermal differential scanning calorimetry (DSC). CNFs accelerated the reaction of epoxy and diamine. PANI surface modification further increased the reaction rate and the extent of reaction. An autocatalytic cure kinetic model was used to fit the reaction curves. It was found that activation energies of the epoxy reaction decreased in the presence of CNFs and PANI modified CNFs. The observed catalytic effect of CNF and PANI surface coating can be very useful for low temperature cure of large epoxy composite products. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

有机硅树脂合成及其共混改性研究

通过实验筛选出合成有机硅树脂的配方，讨论了原料配比、水解温度，介质酸度和溶剂组成对有机硅树脂的影响。采用傅里叶变换红外光谱表征了聚甲基丙烯酸丁酯(PBMA)共混改性有机硅树脂前后的结构特征；采用扫描电子显微镜分析了有机硅树脂、PBMA和PBMA共混改性有机硅树脂的微观结构，进而探讨，改性有机硅树脂室温同化机理，即有机硅树脂分子和PBMA分子之间的互相介入、互相贯穿使之形成网络，具有了自由基协同效应。     

不需二次硫化的ACM胶料的研究及其配合剂的国产化

采用日本AR840胶和AR72F胶及其国产配合剂可以制作不需二次硫化的ACM胶料.     

齿科粘合剂固化体系的现状

介绍了齿科粘合剂现在所主要采用的两种固化体系;化学固化体系和光固化体系,并分析了其优缺点。     

Novel rapid‐cure adhesives for low temperature using thiirane compound

We investigated improvement of workability (viscosity), storage stability, and curing ability of thiirane resin for adhesive applications. The viscosity of bisphenol‐F thiirane resin was lower than that of bisphenol‐A thiirane resin, especially at low temperatures, thus improving ease of handling. Addition of diphenyl decyl phosphite improved its storage stability to a level similar to that of bisphenol‐A epoxy resin. The curing of bisphenol‐F thiirane resin increased three times faster by adding 2,4,6‐tris(dimethylaminomethyl)phenol (DMP‐30) as a tertiary amine. In applications of this new thiirane resin as civil and architectural adhesives, a superior curing ability at low temperature was attained. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 2953–2957, 2001