| Summary: | 碩士 === 義守大學 === 材料科學與工程學系 === 90 === ABSTRACTS
The study was focused on the evaluation of emulsifying graft-copolymerization of ABS polymers (Acrylonitrile-Butadiene-Styrene). The following parameters were chosen to explore the effects on the reaction system as well as the product properties: (1) Ratios in surfactants, (2) Comparison on activator systems, (3) SBR Styrene-Butadiene Rubber) variety, (4) SBR contents (5) Addition of high rubber content in feed.
From the modulation of reaction parameters, we figured out the relation ship between formulation and product properties so as to get better physical properties of ABS Thus the conversion grafting efficiency and microstructure based on different reaction conditions was be discussed in detail.
The results are summarized as the following:
(1) Ratios in surfactants: The physical properties of ABS could be improved as the replacememt of rosin by 20wt％ of fatty acid,25wt％ of oleic acid, or 50％ of lauric acid.respectively.
(2) Comparison on activator systems:
(a) Upon the range of 50%~55% amount of rubber in feed : Change of the redox system SPP/DX/FES (sodium pyrophosphate/anhydrous dextrose/ferrous sulfate) to EDTA/SFS/FES (sodium ethylenediamine tetraacetate/sodium formaldehyde sulfoxylate/ferrous sulfate), the grafting efficiency of SAN on polybutadiene surface decreased as well as the Izod impact strength droped sharply.
(b) Upon the range of 60%~65% amount of rubber in feed : Replace of DX by SFS in R series, the reaction peak temperature decreased and the latter temperature did not raise again either. Replace of SFS by DX in A series led to the decreased yield of TSC (in an amount of 3%), the decrease of peak temperature, and the poor polymerization as well as the poor physical properties of the copolymer. It is obvious that the activator system can not be exchanged arbitrary.
(3) SBR variety: The replacement of SBR-B latex by SBR-A latex could improve the brightness of the final product.
(4) SBR contents: The impact strength could increase up to a limit when the amount of SBR-B latex added is up to 50%.
(5) Addition of high rubber contents in feed: The 60％ of rubber content in feed gave better grafting efficiency and the physical properties for ABS copolymer.
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