Study on polymorphism of syndiotactic polystyrene
Bu, WS; Li, YY; He, JS
AbstractThe crystallization of the alpha-and beta-form crystals of syndiotactic polystyrene (sPS) is determined by the crystallization temperature. Being crystallized at various temperatures from the melt, sPS forms the beta form crystal at high temperatures above about 230 degrees C, alpha form crystal at low temperatures below about 170 degrees C and a mixture of the alpha and beta form at intermediate temperatures. The effect of different cooling rates is considered in more details. Since the beta form crystallizes at high temperature from the melt. It will first crystallize during cooling. At low cooling rates,the crystalline phase of the beta form has almost reached the maximum crystallinity of the sample by cooling to 230 degrees C. So even the temperature for the a form formation is reached,there is no more crystallizable sPS portion remaining for the a form formation. That is the reason why the beta form is always obtained by cooling at a slow or moderate rate. If cooling rate is high enough that the beta form has almost no time to crystallize at high temperature,only the a form can crystallize at low temperature. That is the reason why only the a form crystal is obtained under quenching conditions. It clearly indicates that the crystallization temperature is the intrinsic factor controlling the formation the alpha- and beta-form crystals.
KeywordSyndiotactic Polystyrene Polymorphism
Indexed BySCI
WOS IDWOS:000089003100023
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Document Type期刊论文
Corresponding AuthorBu, WS
AffiliationChinese Acad Sci, Inst Chem, Ctr Mol Sci, State Key Lab Engn Plast, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Bu, WS,Li, YY,He, JS. Study on polymorphism of syndiotactic polystyrene[J]. ACTA POLYMERICA SINICA,2000(4):496-498.
APA Bu, WS,Li, YY,&He, JS.(2000).Study on polymorphism of syndiotactic polystyrene.ACTA POLYMERICA SINICA(4),496-498.
MLA Bu, WS,et al."Study on polymorphism of syndiotactic polystyrene".ACTA POLYMERICA SINICA .4(2000):496-498.
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