臺灣博碩士論文加值系統

對位性聚苯乙烯(sPS)歸屬於新世代工程塑膠，其應用性與其結晶性有相當大之關聯。在本研究中主要以微差掃描熱卡計(DSC)對sPS進行不同之熱處理，藉以探討sPS於不同結晶條件下之結晶行為與熔融行為。並配合廣角X光繞射儀(WAXD)及偏光顯微鏡(POM)，探討sPS於不同結晶條件下所形成晶體之結構及結晶相形態。研究結果顯示：(1) 當結晶前之熔化溫度(Tmax)或結晶溫度(Tc)愈高時，sPS的總體結晶速率及晶體成長速率愈慢；(2) sPS於DSC的升溫掃描過程中，依結晶條件之不同可具有多重熔融峰的特性；當呈現三個熔融峰時，最低溫之熔融蜂可判定為β型晶體熔化所造成，中間之熔融峰則是α型晶體熔化所引起，而最高溫之熔融峰則是不穩定晶體在升溫過程中熔化-再結晶-再熔化所導致；(3) Tmax及Tc皆對sPS結晶所形成晶體之結構有影響：Tmax及Tc愈高，β型晶體的含量愈多；Tmax及Tc愈低，α型晶體的含量愈多；(4) 不同之結晶條件，sPS可呈現不同之結晶相形態；Tmax及Tc愈高時，結晶相形態偏向於樹枝狀球晶或軸晶。此外，亦發現sPS可生成正光性與負光性球晶，惟負光性球晶之量極少。

Due to its crystalline characteristics, syndiotactic polystyrene (sPS) has been classified as one kind of engineering thermoplastics. Its versatile is well recognized. In this study, differential scanning calorimetry (DSC), polarized optical microscopy (POM) and wide angle x-ray diffraction (WAXD) techniques were used to reveal the relationships among the crystallization kinetics, melting behavior, crystal morphology and crystal structure of sPS. The results show that the overall crystallization rate and crystal growth rate increase as the pre-melting temperature (Tmax) and the crystallization temperature (Tc) decrease. The crystallization-condition dependent multiple melting peaks are observed and resolved. The lowest melting peak (peak I) represents the melting of metastable b form crystal, and the middle melting peak (peak II) is caused by the melting of a form crystal. The highest melting peak (peak III) results from the "recrystallization-remelting"mechanism of b form crystal. According to the WAXD results, the content of a form crystal in the overall crystalline region increases as Tmax and Tc decrease. The crystal morphology is crystallization-condition dependent, too. It changes gradually from spherulite-like texture to axialite-like texture as Tmax and Tc increase.

第一章 緒論1第二章 文獻回顧4 2-1 新世代(metallocene)觸媒與特性4 2-2 對位性聚苯乙烯7 2-2.1 對位性聚苯乙烯的分子結構7 2-2.2 對位性聚苯乙烯的特性與應用7 2-2.3 對位性聚苯乙烯的晶體結構9 2-2.4對位性聚苯乙烯的晶體成長速率與結晶相形態12 2-2.5對位性聚苯乙烯的熔融行為13 2-3 高分子結晶特性15 2-3.1 結晶性高分子與非結晶性高分子15 2-3.2 高分子結晶的條件15 2-3.3 結晶對高分子物性的影響16 2-4 高分子結晶原理18 2-4.1 影響結晶速率之因素18 2-4.2 結晶現象研究方式19 2-4.3等溫結晶動力學22 2-5 高分子結晶形態學26 2-5.1 結晶相形態模型26 2-5.2 結晶相形態之形成29第三章 實驗部分32 3-1 實驗材料及藥品32 3-2 實驗儀器33 3-3 實驗步驟34 3-3.1 微差掃描熱卡計(DSC)34 3-3.2 偏光顯微鏡(POM)37 3-3.3 廣角X光繞射儀(WAXD)39第四章 結果與討論41 4-1 結晶行為41 4-1.1 非等溫結晶行為41 4-1.2 等溫結晶行為42 4-1.2A 總體結晶行為42 4-1.2B 晶體成長速率46 4-2 熔融行為48 4-2.1 不同結晶條件對熔融行為之影響48 4-2.2 不同升溫速率對熔融行為之影響51 4-3 晶體結構54 4-3.1 非等溫結晶之晶體結構54 4-3.2 等溫結晶之晶體結構55 4-4結晶相形態57第五章 結論59參考文獻 60

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