- 學位論文
SBS及SBS/PS合膠破壞強度與微結構之關聯研究
Fracture Energies and Related Microstructure of SBS and SBS/PS Blends
若您是本文的作者，可授權文章由華藝線上圖書館中協助推廣。
摘要
摘要 本論文，針對三種不同製程所得SBS試樣以及SBS/PS混摻試樣做為兩個主要研究的部份。不同製程所得SBS試樣是指由甲苯溶液成形的SBSI與直接熱壓成形的SBSII以及經塑譜儀混鍊後再熱壓成形的SBSIII。而SBS/PS混摻試樣則是指以SBS為基材，藉由塑譜儀混鍊的方式，添加不同重量比例的PS，使系統中PS與PB鏈段之比例改變。 吾人藉由撕裂測試求取各試樣之破壞能量，以動態機械性質測試與流變儀分別量測PB與PS鏈段玻璃轉移溫度及其對應的tand值，以瞭解不同製程或組成含量改變對各鏈段熱性質的影響。並經由Flory-Rhener方程式計算物理交聯點間分子量大小。再藉穿透式電子顯微鏡與小角度X光散射觀察分子形態，最終目的在於探討巨觀破壞能量與微觀分子結構間相互之關聯性。 結果發現，不同製程SBS試樣中，SBSI具有較不連續的PS domain與較規則的分子排列，而有最小的破壞能量。而SBSIII因混鍊轉矩應力作用使得SBS分子鏈在PB鏈段處斷裂，造成物理交聯點間分子量下降，所以SBSIII破壞能量小於SBSII。而對於SBS/PS混摻的各個試樣，則以SBS/PS重量組成是100/44時有最大的破壞能量。
並列摘要
ABSTRACT The objective of this study is to investigate fracture energies and related morphology of two systems. The first is specimens of neat styrene-butadiene-styrene (SBS) block copolymers and the second is SBS/polystyrene (PS) blends. The neat SBS specimens were prepared from three different methods; SBSI specimens were cast from toluene solution, SBSII specimens were prepared from compression molding and SBS III specimens were prepared from compression molding after processing in a brabender internal mixer. The specimens of SBS/PS blends with different PS contents were prepared using a brabender internal mixer as well. Fracture energies of all the specimens were measured using a trouser tear test. The glass transition temperatures and tand of PB and PS segments were measured by thermal and dynamic mechanical analyses. The average network strand molecular weight, Mc, were determined by the Flory-Rehner equation from equilibrium swelling using isooctane as a diluent. The microstructure were studied using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). For the neat SBS specimens, SBSI possesses the lowest fracture energies because of morphology with less continuous PS domain and more regular microstructure. The fracture energies of SBSIII were smaller than SBSII due to a smaller value of Mc . For the specimens of SBS/PS blends, SBS/PS=100/44 specimens possess the largest fracture energies than the others. (Keywords: SBS/PS blend; fracture energy; morphology).
參考文獻
1. C. Wang and C. -I. Chang, J. Polym. Sci., Polym. Phys. Ed., 35, 2003 (1997).
2. C. Wang and C. -I. Chang, J. Polym. Sci., Polym. Phys. Ed., 35, 2017 (1997).
3. 張志夷, 熱塑性彈性體之破壞行為, 元智工學院化工碩士論文, 1996.
4. 董士德, SBS及SBS/PS合膠經硫化交聯之破壞強度研究, 元智大學化工碩士論文, 1998.
5. 石璋彥, SBS及SBS/PS合膠經酚醛樹脂交聯之破壞強度研究, 元智大學化工碩士論文, 1998.