The crystallinity and miscibility of syndiotactic polystyrene blends after mixing with low molar mass liquid crystal or commercial lubricant |
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Authors: | Pichet Pahupongsab Supakanok Thongyai Sirirat Wacharawichanant Piyasan Prasertdham |
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Institution: | (1) Institute of Polymer Science, Chemistry College, Xiangtan University, Xiangtan, 411105, Hunan Province, People’s Republic of China;(2) Shanghai Research Institute of Petrochemical Technology, Shanghai, 201208, People’s Republic of China; |
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Abstract: | The quantities of the crystallinity of syndiotactic polystyrene (SPS) blended with another polymer in the group of poly(α-methyl
styrene), poly(n-butyl methacrylate) or poly(cyclohexyl acrylate) with or without the additives were measured by X-ray diffraction and calculated
by Ruland’s method. The SPS was synthesized by using metallocene catalyst and modified-methylaluminoxane as cocatalyst. The
additive of low molar mass liquid crystal chemical (cyclohexyl-biphenyl-cyclohexane (CBC33)) or lubricant (glycerol monostearate
(GMS)) was individually added to the blends of SPS in order to investigate the effects on the crystallinity of the blended
SPS. From the experimental results, it was found that the percent crystallinities of the blends decreased with decreasing
the percent of SPS in the blend because of the dilution of SPS. The depression of the percent crystallinity was in the order
of PaMS > PCHA > PBMA according to the compatibility with SPS. The addition of GMS or CBC33 slightly decreased the percent
crystallinity of the pure SPS. The addition of GMS impeded the depression of the SPS crystallinity in the blends, because
their percent depression from pure SPS is similar (at around 25%) regardless to the components of the blends. The blends with
added CBC33 have the similar depression of crystallinity as the pure blends because of the low concentration of CBC33 and
the good compatibility of CBC33 with the SPS. |
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