Slide cao su hóa học và công nghệ chemistry of accelerated sulfur vulcanization

.c om cu u du o ng th an co ng CHEMISTRY OF ACCELERATED SULFUR VULCANIZATION CuuDuongThanCong.com https://fb.com/tailieudientucntt du o ng th an co ng Benzothiazole group 2- Mercaptobenzothiazole 2-bisbenzothiazole-2,2’-disulfide 2-bisbenzothiazole-2,2’-polysulfide Zinc-mercaptobenzothiazole polysufides Rubber Benzothiazole terninated polysulfidic radilcal 2-cyclohexyldithiobenzothiazole u Bt MBT or BtSH MBTS or Br-SS-Bt BTP or BtS-SX-SBt BtS-Zn-SX-SBt RH Bt-SX* CDB cu • • • • • • • • c om List of Abbreviations CuuDuongThanCong.com https://fb.com/tailieudientucntt .c om an co ng • A- ACCELERATED CHEMISTRY • B CROSSLINKING CHEMISTRY cu u du o ng th • C POST-CROSSLINKING CHEMISTRY CuuDuongThanCong.com https://fb.com/tailieudientucntt .c om A- ACCELERATED CHEMISTRY co ng • Formation of MBTS from MBS • Reaction of sulfur with MBTS and other cu u du o ng th an accelerator polysulfides • Exchange reaction among acceleratorpolysulfides • Effect of ZnO-Formation of ZincAccelerator Complexes CuuDuongThanCong.com https://fb.com/tailieudientucntt .c om B CROSSLINKING CHEMISTRY co ng • Formation of crosslink precursors • Conversion of crosslink precursors to cu u du o ng th an crosslink • Scorch delay reaction CuuDuongThanCong.com https://fb.com/tailieudientucntt .c om C POST-CROSSLINKING CHEMISTRY co ng • Crosslink desulfuration • Crosslink degradation and main- chain- cu u du o ng th an modification CuuDuongThanCong.com https://fb.com/tailieudientucntt .c om ng co an th ng du o u cu CuuDuongThanCong.com https://fb.com/tailieudientucntt .c om ng co an th ng du o u cu CuuDuongThanCong.com https://fb.com/tailieudientucntt .c om ng co an th ng du o u cu CuuDuongThanCong.com https://fb.com/tailieudientucntt .c om ng co an th ng du o u cu CuuDuongThanCong.com https://fb.com/tailieudientucntt .c om Formation of crosslink precursors • Crosslink precursors are formed when the cu u du o ng th an co ng accelerator polysulfides react with the rubber chains, resulting in structures RSX-SBt • If Zinc is complexed to the accelerator polysulfide, the crosslink precursors can be BtS-Zn-SXSBt CuuDuongThanCong.com https://fb.com/tailieudientucntt .c om Conversion of crosslink precursors to crosslinks RSY* + BtSZ* co ng RSXSBt RSYR ng th an RSY* + Rubber cu u du o BtSZ* can undergo a variety of reaction like radical recombination to yield BtSSXSBt CuuDuongThanCong.com https://fb.com/tailieudientucntt .c om ng co an th ng du o u cu CuuDuongThanCong.com https://fb.com/tailieudientucntt cu u du o ng th an co ng c om The Zinc chelation can stabilize other sulfur bonds Thus, in the presence of Zinc many of S-S bonds can break CuuDuongThanCong.com https://fb.com/tailieudientucntt ... om A- ACCELERATED CHEMISTRY co ng • Formation of MBTS from MBS • Reaction of sulfur with MBTS and other cu u du o ng th an accelerator polysulfides • Exchange reaction among acceleratorpolysulfides... om List of Abbreviations CuuDuongThanCong.com https://fb.com/tailieudientucntt .c om an co ng • A- ACCELERATED CHEMISTRY • B CROSSLINKING CHEMISTRY cu u du o ng th • C POST-CROSSLINKING CHEMISTRY. .. Effect of ZnO-Formation of ZincAccelerator Complexes CuuDuongThanCong.com https://fb.com/tailieudientucntt .c om B CROSSLINKING CHEMISTRY co ng • Formation of crosslink precursors • Conversion of