环氧化天然橡胶的研究与应用

环氧化天然橡胶（ENR）是由NR化学改性而成,笔者阐述了环氧化天然橡胶制备原理和方法、环氧化天然橡胶性能及应用研究、环氧化天然橡胶共混改性研究,其中包括ENR与PVC共混体系的研究、ENR其它共混体系的研究和ENR改性的研究.     

环氧化天然橡胶的基本性能

本文综述了环氧化天然橡胶的制法、结构、配合与加工及硫化胶的基本性能,分析了由环氧化天然橡胶的特殊性能带来的应用前景。     

天然橡胶的化学改性

介绍了天然橡胶的环氧化改性和氯化改性,天然橡胶的氢氯化、氢化、环化和接枝改性及热塑性天然橡胶等研究。     

轮胎橡胶复合材料的制备方法

环氧化天然橡胶是一种对天然橡胶进行环氧化改性得到的新型聚合物,具有优异的气密性、耐油性以及良好的黏着性,同时具有良好的抗湿滑性与较低的滚动阻力,在高性能绿色轮胎的应用中有广阔的应用前景。以环氧化天然橡胶复合材料为例,探究制备方法和过程。     

天然橡胶的研究与发展

论述了关于天然橡胶的研究与发展中的一些重要方面,介绍了一种具有良好耐油性能和优越耐热性的从天然橡胶衍生出的新型高性能材料－－热塑性环氧化天然橡胶（ＴＰＥＮＲ）,简要介绍了环氧化天然橡胶（ＥＮＲ）和热塑性天然橡胶（ＴＰＮＲ）的发展概况以及别外一种可能有用的天然橡胶品种－－液体天然橡胶（ＬＮＲ）,阐述在ＮＲ／ＮＢＲ和ＮＲ／ＥＰＤＭ并用体系中,控制交联分布的新技术对橡胶性能所产生的影响,列举这些并用体系     

环氧化天然橡胶多元接枝胶粘剂粘合性能的研究

环氧化天然橡胶多元接枝胶粘剂粘合性能的研究宋刚玉黄有发（华南理工大学,广州５１０６４１）环氧化天然橡胶（ＥＮＲ）是在ＮＲ主分子链的双键中引入环氧基团的新型改性聚合物。它除保留了ＮＲ的多种优异性能外,还具有一些特殊性能,因此有着广阔的应用前景［１］。由...     

环氧化天然橡胶的特性与应用

环氧化天然橡胶 (ENR)是由天然胶乳与过氧化氢 /乙酸反应制得的一种聚合物。它在保留天然橡胶 (NR)多种优异性能的基础上 ,其气密性、耐油性、粘着性均有很大提高 ,同时还具有良好的抗湿滑性和较低的滚动阻力 ,是有着广泛应用前景。本文主要介绍 ENR的特性与应用。一、天然胶乳的环氧化早期的研究首先尝试在均相溶液 (苯、氯仿 )中进行溶液环氧化 ,采用过苯甲酸类(邻单过苯二甲酸、过苯甲酸、卤化过苯甲酸 )和过乙酸等作为环氧化试剂 ,小心控制可获得高的环氧化度。由于工业化的要求 ,胶乳中直接环氧化引起人们的更大兴趣 ,显然 ,它比有…     

环氧化天然橡胶／丁基再生胸并用胶的性能

涉及环氧化天然橡胶／丁基再生胶并用体系的力学性能，着重探讨掺混丁基再胶对环氧化天然橡胶耐热氧老化性能的效应。     

环氧化天然橡胶在全钢子午线轮胎胎面配方中的应用

研究了环氧化天然橡胶(ENR-40)在全钢子午线轮胎胎面配方中的应用效果。试验表明,ENR-40部分取代NR应用到轮胎配方中具有一定的优异性,对胎面配方硫化特性影响不大,胎面胶配方的物理机械性能提高,压缩疲劳生热降低。     

白炭黑在环氧化天然橡胶中的应用

摘要：研究在不使用任何偶联剂的条件下,白炭黑在环氧化天然橡胶（ENR）中的应用。白炭黑在天然橡胶（NR）中会发生明显的团聚,而在ENR中的团聚情况可得到明显改善,且ENR的环氧化程度越高,白炭黑的分散性越好。ENR白炭黑胶料表现出良好的抗湿滑性能和较低的滚动阻力,白炭黑用量大T20份时,ENR/白炭黑胶料的压缩生热明显低于NR／炭黑胶料。     

橡胶加工分析仪研究环氧化天然橡胶的性能

用橡胶加工分析仪对环氧化天然橡胶进行了温度扫描、频率扫描和应变扫描，并和天然橡胶的响应曲线进行了对比。     

Characterization of epoxidized natural rubber by 2D NMR spectroscopy

Assignment of signals in aliphatic region of ¹H NMR spectrum for epoxidized natural rubber was carried out through NMR spectroscopy. The epoxidized natural rubber was prepared by epoxidation of purified natural rubber with peracetic acid in latex stage followed by degradation with propanal and ammonium persulfate. The resulting liquid epoxidized natural rubber was characterized through 1D- and 2D-NMR spectroscopy. The unknown signals in the aliphatic region of the ¹H NMR spectrum were assigned through ¹³C NMR and two-dimensional heteronuclear shift correlation (HETCOR) measurement. The assignments were proved by two-dimensional inverse detected heteronuclear long-range shift correlation (HMBC) and two-dimensional homonuclear shift correlation (COSY) measurements, and they were supported with epoxidized squalene as a model compound through NMR spectroscopy.     

环氧化天然橡胶贮存性能的变异

对环氧化天然橡胶 (ENR)及其胶乳 (ENRL)进行了为期 2年的贮存试验 ,考察其外观和主要物理性能的变异状况 ,探讨了这些性状变异的机理 ,了解到ENR和ENRL原材料长期贮存 ,其外观无明显变化。     

Quantitative analysis for reaction between epoxidized natural rubber and poly (L‐lactide) through 1H‐NMR spectroscopy

Reaction between epoxidized natural rubber and poly(L ‐lactide) (PLLA) was investigated quantitatively in terms of conversion of the epoxidized natural rubber. The epoxidized natural rubber was prepared by epoxidation of high ammonia natural rubber (HA‐NR) or deproteinized natural rubber (DPNR) with peracetic acid followed by depolymerization with ammonium persulfate. The resulting liquid HA‐NR having epoxy group (LENR) or liquid DPNR having epoxy group (LEDPNR) were subjected to heating at 473 K for 20 min, after blending with PLLA. The products were characterized through morphology observation, DSC measurement, and ¹H‐NMR spectroscopy. The conversions of the rubbers were estimated from intensity ratio of signals in ¹H‐NMR spectrum for the products after removing unreacted rubber with toluene. Difference in the estimated conversion between the LENR/PLLA and LEDPNR/PLLA blends was interpreted in relation to proteins present in the rubber. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

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。     

硅藻土/天然橡胶复合材料的性能研究

利用环氧化天然胶乳作为硅藻土的界面改性剂,制备了硅藻土/天然橡胶复合材料,通过无转子流变仪、电子万能材料试验机和橡胶动态压缩生热仪,研究了复合材料的硫化特性,物理机械性能和温升特性。结果表明,硅藻土/天然橡胶复合材料的焦烧与正硫化时间随着硅藻土含量的增加,先增后减;最大与最小扭矩随硅藻土含量的增加而增加;硅藻土/天然橡胶复合材料的拉伸与撕裂强度均有提高,当硅藻土含量为4phr时,拉伸强度最高,为28.5MPa;当硅藻土的含量为2phr时,撕裂强度最高,为37.9N/mm;由于硅藻土的加入,材料的内生热显著降低。     

Structure,morphology, thermal,and sorption characteristics of epoxidized natural rubber conjugated spent coffee via one-pot synthesis

The present work highlights the preparation of the epoxidized natural rubber conjugated spent coffee biocomposites (ENR-g-SC) via one-pot synthesis to control petroleum oil spills. The structural determination of the spent coffee grafted epoxidized natural rubber (ENR-g-SC) was confirmed through FTIR and ¹H-NMR spectroscopic analyses. The thermal performance, tensile tests, and morphological properties of the synthesized (ENR-g-SC) biocomposites were performed. The data revealed that ENR-g-SC biocomposite with 20 phr of spent coffee (SC) exhibited the highest tensile properties due to maximal chemical linkages of spent coffee and epoxide groups in ENR. The epoxidized natural rubber conjugated spent coffee copolymers were evaluated as oil sorbers for oil absorbency applications in chloroform, toluene, and 10% crude petroleum diluted with toluene. The data revealed that the oil absorbency increased slightly with chloroform or toluene instead of 10% crude oil diluted with toluene. Furthermore, swelling and network parameters including the maximum oil absorbency (Q_max), swelling rate constant (k), polymer-solvent interaction (χ), effective crosslink density (ύe), equilibrium modulus of elasticity (G_T), and average molecular weight between crosslinks (M_c) and theoretical crosslink density (ύ_t) were determined, and correlated to the efficiency of the synthesized epoxidized natural rubber conjugated spent coffee.     

Processability characteristics and physico‐mechanical properties of natural rubber modified with rubber seed oil and epoxidized rubber seed oil

The processability characteristics and physico‐mechanical properties of natural rubber (NR) modified with raw rubber seed oil and epoxidized rubber seed oil have been studied. The modified mixes showed higher scorch time and lower cure rate, crosslink density, and ultimate state of cure compared to an unmodified mix. The thermal stability of the vulcanizates was practically unaffected by the modification. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 1413–1418, 2000