NR(natural rubber)based and its blend with BR(polybutadiene rubber)and NBR(nitrile rubber)composites were synthesized using reinforcing filler and other relevant additives.PCNSL(phosphorylated cashew nut shell liquid)...NR(natural rubber)based and its blend with BR(polybutadiene rubber)and NBR(nitrile rubber)composites were synthesized using reinforcing filler and other relevant additives.PCNSL(phosphorylated cashew nut shell liquid)modified kaolin,SRSO(sodium salt of rubber seed oil)modified kaolin and commercially available cloisite 30b were used as filler for reinforcement to achieve improved mechanical properties.Kaolin was modified with PCNSL either in two methods,by solvent treated method or sodium salt method and varying concentrations were prepared for comparison.No rate of intercalation was found with solvent treated PCNSL,but achieved with sodium salt of PCNSL.While comparing SRSO and SPCNSL,it is found that better intercalation and property improvement were achieved with only SRSO,since it possesses up to 18 carbon atoms in the side chain than the PCNSL with 15 carbon atoms side chain.展开更多
The use of organically enhanced kaolin clay as reinforcing filler for NR(natural rubber)and blends of NR with NBR(nitrile-butadiene rubber)and poly BR(butadiene rubber)system were investigated on the basis of DMA(dyna...The use of organically enhanced kaolin clay as reinforcing filler for NR(natural rubber)and blends of NR with NBR(nitrile-butadiene rubber)and poly BR(butadiene rubber)system were investigated on the basis of DMA(dynamic mechanical analysis).Kaolin clay was modified using a chemical complex of HH(hydrazine hydrate)and SRSO(sodium salt of rubber seed oil).Intercalation of SRSO into kaolin under optimized condition showed an inter-lamellar layer expansion to 4.668 nm,compared to the characteristic d001 XRD(X-ray diffraction)peak of pristine kaolin at 0.714 nm.The morphology,visco-elastic behavior,modulus property,polymer miscibility and Tg(glass transition temperature)of nano-kaolin filled NR and its blend with synthetic rubbers have been studied in detail.DMA showed a diminution in tanδpeak height and a modulus shift in correspondence with increased CLD(crosslink density).Pure NR shows only~1%increase in storage modulus(E′)while adding nanoclay rather than micron sized pristine clay under experimental conditions,because of the feeble interaction between filler and matrix,as compared to blend.An increment of~76%and~117%in E′was recognized by the addition of 4 wt%nanoclay in blends such as BR mK and NBR mK.With loss modulus(E″)pure NR shows only~7%decrease while adding nanoclay,compared to blend.A decrement of~54%and~55%in E″by the addition of 4 wt%nanoclay in BR mK and NBR mK blends were observed.As a whole,DMA was performed to figure out the effect of surface modification enabling to materialize composite.展开更多
文摘NR(natural rubber)based and its blend with BR(polybutadiene rubber)and NBR(nitrile rubber)composites were synthesized using reinforcing filler and other relevant additives.PCNSL(phosphorylated cashew nut shell liquid)modified kaolin,SRSO(sodium salt of rubber seed oil)modified kaolin and commercially available cloisite 30b were used as filler for reinforcement to achieve improved mechanical properties.Kaolin was modified with PCNSL either in two methods,by solvent treated method or sodium salt method and varying concentrations were prepared for comparison.No rate of intercalation was found with solvent treated PCNSL,but achieved with sodium salt of PCNSL.While comparing SRSO and SPCNSL,it is found that better intercalation and property improvement were achieved with only SRSO,since it possesses up to 18 carbon atoms in the side chain than the PCNSL with 15 carbon atoms side chain.
基金support to carry out the work as part of an ongoing CSIR Network project(No.CSC-0135).
文摘The use of organically enhanced kaolin clay as reinforcing filler for NR(natural rubber)and blends of NR with NBR(nitrile-butadiene rubber)and poly BR(butadiene rubber)system were investigated on the basis of DMA(dynamic mechanical analysis).Kaolin clay was modified using a chemical complex of HH(hydrazine hydrate)and SRSO(sodium salt of rubber seed oil).Intercalation of SRSO into kaolin under optimized condition showed an inter-lamellar layer expansion to 4.668 nm,compared to the characteristic d001 XRD(X-ray diffraction)peak of pristine kaolin at 0.714 nm.The morphology,visco-elastic behavior,modulus property,polymer miscibility and Tg(glass transition temperature)of nano-kaolin filled NR and its blend with synthetic rubbers have been studied in detail.DMA showed a diminution in tanδpeak height and a modulus shift in correspondence with increased CLD(crosslink density).Pure NR shows only~1%increase in storage modulus(E′)while adding nanoclay rather than micron sized pristine clay under experimental conditions,because of the feeble interaction between filler and matrix,as compared to blend.An increment of~76%and~117%in E′was recognized by the addition of 4 wt%nanoclay in blends such as BR mK and NBR mK.With loss modulus(E″)pure NR shows only~7%decrease while adding nanoclay,compared to blend.A decrement of~54%and~55%in E″by the addition of 4 wt%nanoclay in BR mK and NBR mK blends were observed.As a whole,DMA was performed to figure out the effect of surface modification enabling to materialize composite.