EFFECT OF COMPOSITION AND PROCESSING CONDITION ON MICROSTRUCTURAL PROPERTIES AND DURABILITY OF FLUOROPOLYMER/ACRYLIC BLENDS
EFFECT OF COMPOSITION AND PROCESSING CONDITION ON MICROSTRUCTURAL PROPERTIES AND DURABILITY OF FLUOROPOLYMER/ACRYLIC BLENDS
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DOI：
10.1142/s0256767909003650
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发表时间：
2009-01
影响因子：
4.3
通讯作者：
L. Sung;X. Gu;D. Ho;F. Landis;D. Nguyen
中科院分区：
文献类型：
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作者：
L. Sung;X. Gu;D. Ho;F. Landis;D. Nguyen
含氟聚合物共混物由于其优异的抗紫外线（UV）辐射性以及对许多腐蚀性化学试剂的耐受性而被广泛用作外墙涂料的基料。已知氟化组分通常具有较低的玻璃化转变温度，并且取决于共混物组成和样品退火条件而容易在最终结构中结晶。我们研究了共混物组成和退火工艺（缓慢和快速冷却）对聚偏氟乙烯/聚甲基丙烯酸甲酯（PVDF/PMMA）共混物在紫外光照射前后的表面形态和微观结构的影响。用原子力显微镜（AFM）和激光扫描共聚焦显微镜（LSCM）研究了表面和亚表面的微观结构。采用小角中子散射和光散射技术对PVDF涂层在紫外光照射前后的微观结构进行了表征。较高的PVDF含量和缓慢的冷却过程导致较大的球晶微晶结构和粗糙的表面形貌。显着有序的球晶微晶结构已被观察到的表面和散装膜紫外线照射后。
Fluoropolymer blends have been widely used as binders for exterior coatings because of their excellent resistance to ultra-violet (UV) radiation as well as to many corrosive chemical agents. It is known that the fluorinated component usually has a lower glass transition temperature and easily crystallizes in the final structure depending upon the blend composition and sample annealing condition. We investigated the effect of blend composition and annealing process (slow and fast cooling) on the surface morphology and microstructure a poly(vinylidene fluoride)/poly(methyl methacrylate) (PVDF/PMMA) blend before and after UV exposure. Surface and subsurface microstructures were studied by atomic force microscopy (AFM) and laser scanning confocal microscopy (LSCM). Bulk microstructure of PVDF-coatings before and after UV exposure were characterized using small angle neutron and light scattering. Higher PVDF content and a slow cooling process result in larger spherulite crystallite structure and rougher surface morphology. Significant ordering in the spherulite crystallite structure has been observed on the surface and the bulk films after UV exposure.