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Use of in situ generated lewis acids in crosslinking of elastomers

机译：原位生成的路易斯酸在弹性体交联中的用途

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New unconventional method of crosslinking of styrene-buta-diene rubber (SBR) and epoxidized natural rubber (ENR) was elaborated.To initiate the crosslinking process,Lewis acids generated in situ in reaction of acid precursors-chlorosulfonated polyethylene (CSM),differing in chlorine content (CSM-Table 1),and ZnO were used.The following properties of SBR/CSM/ZnO blends were determined:vulcametric moment (M),equilibrium swelling (Q_v) as well as the content of a fraction soluble in chosen solvents [2-butanone-MEK (Q_v~(MEX)),toluene-TOL (Q_v~(TOL)),or tetrahydro-furane-THE (Q_v~(THF))],the content of chlorine bounded in the blends investigated (Table 6),Mooney-Rivlin elasticity constants (2C_1~N) as well as tensile strength (TS_b) (Table 2-4,7).The effects of the type and amount of CSM (Figs.2,3) and ZnO (Fig.l) as well as SBR/CSM ratio on SBR curing rate and degree were investigated.For comparison,ZnO in SBR/CSM blend was substituted with another oxides:MnO_2,CuO,SnO or Fe_2O_3 (Fig.8,Table 7).Only in the cases of SnO or Fe_2O_3 acceptable while significantly worse results were obtained.Effect of ZnO content on ENR/CSM blend curing rate and degree has been also determined (Fig 9).Courses of SBR and ENR curing were analyzed using FTIR spectroscopy (Fig.4 and 10,Table 5),dynamic thermomechanical analysis (DMTA-Fig.6) and SEM (Fig.7).SBR curing is a result of its phenyl rings' alkylation with polymeric halide (CSM) and autoalkylation with SBR chains containing 1,2- and 1,4-cis-butadiene monomer units,catalyzed with ZnCl_2 formed in situ from ZnO and CSM.IR spectra analysis leads to the conclusion that ENR curing is a result of oxirane groups' polymerization also catalyzed with in situ formed ZnCl_2.
机译：阐述了苯乙烯-丁二烯橡胶（SBR）和环氧化天然橡胶（ENR）非常规交联的新方法。为引发交联过程，路易斯酸在酸前体-氯磺化聚乙烯（CSM）的反应中原位生成。使用氯含量（CSM-表1）和ZnO。测定了SBR / CSM / ZnO共混物的以下性质：体积模量（M），平衡溶胀（Q_v）以及可溶于所选溶剂的馏分的含量[2-丁酮-MEK（Q_v〜（MEX）），甲苯-TOL（Q_v〜（TOL））或四氢呋喃-THE（Q_v〜（THF））]，研究了共混物中结合氯的含量（表6），Mooney-Rivlin弹性常数（2C_1〜N）以及抗张强度（TS_b）（表2-4,7）.CSM的类型和数量（图2,3）和ZnO的影响（为了比较，用另一种氧化物：MnO_2，CuO，SnO或Fe_2O_3代替SBR / CSM共混物中的ZnO（图8）。 7）。只有在SnO或Fe_2O_3可接受的情况下，才能获得明显更差的结果。还确定了ZnO含量对ENR / CSM共混固化速率和程度的影响（图9）。分析了SBR和ENR固化的过程使用FTIR光谱仪（图4和10，表5），动态热力学分析（DMTA-图6）和SEM（图7）.SBR固化是苯环与聚合卤化物（CSM）烷基化的结果。由含有ZnO和CSM的ZnCl_2催化的含有1,2-和1,4-顺式丁二烯单体单元的SBR链进行自动烷基化。红外光谱分析得出的结论是ENR固化也是环氧乙烷基团聚合的结果原位生成的ZnCl_2催化。

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