بررسی میکروسکوپی تاثیر درصد اختلاط و توزیع ذرات بر روی مقاومت به پوسیدگی چندسازه خاک اره- پلی پروپیلن

نوع مقاله: مقاله پژوهشی

چکیده

در این پژوهش مقاومت به پوسیدگی چندسازه خاک اره-پلی‌پروپیلن مورد بررسی میکروسکوپی قرار گرفت. ارزیابی تاثیر درصدهای وزنی متفاوت خاک اره (45، 60 و 75 درصد)، بر روی میزان پوسیدگی در این پژوهش مورد نظر بوده است.برای انجام آزمون پوسیدگی از استاندارد 99-ASTM D1413 و قارچ رنگین کمان (Trametes versicolor) استفاده شد. پس از 12 هفته مجاورت نمونه‌ها و قارچ، طبق آزمون بلوک خاکی میزان کاهش جرم آنها تعیین گردید. داده­های به‌دست آمده با استفاده از تجزیه واریانس مورد بررسی قرار گرفت. نتایج نشان داد که افزایش درصد خاک اره با افزایش میزان کاهش وزن و پوسیدگی در چند سازه همراه بوده است. بررسی میکروسکوپی توسط میکروسکوپ نوری انجام شد. نتایج به­دست آمده از بررسی میکروسکوپی نشان داد که افزایش درصد خاک اره، منجر به روی­هم افتادگی بیش­تر ذرات، تجمع غیریکنواخت آن­­ها، کاهش میزان کپسوله شدن ذرات توسط پلیمر و نیز افزایش حفرات مابین خاک اره و پلی پروپیلن شده و چند سازه را جهت حمله قارچی مستعدتر نمود.

کلیدواژه‌ها


عنوان مقاله [English]

Microscopic Study on The Effect of Particle Content and Its Distribution on Decay of Sawdust-Polypropylene Composite

چکیده [English]

In this research, the decay resistance of sawdust–polypropylene composite has been evaluated by microscope. The scope of research was to assess the effect of different weight percentages of sawdust (45%, 60% and 75%) sawdust distribution on the fungal decay. ASTM D1413-99 test method was used to carry out decay test and Trametes versicolor was chosen as a white rot fungus.After 12 weeks exposure of the composites samples to the fungi, the weight losses were determind using Soil Block test. Analyzing the data using ANOVA one way statistical method, it has been shown that the weight losses of the composite due to decay were proportional to the sawdust weight percentages. Also, it was found that weight losses were higher in those treatments with upper sawdust percentages. In order to microscopic study, a light microscope was used.The results showed that increasing in the weight percentage of sawdust, led to particles aggregation, their nonuniform dispersion, decreasing in particles encapsulating by polymer and increasing in hollows and voids between sawdust and polypropylene which made the composite susceptible forfungi attack.

کلیدواژه‌ها [English]

  • Sawdust-polypropylene composite
  • Decay resistance
  • Soil block test
  • Trametes versicolor
  • Microscopic study
منابع

1.American Society for Testing and Materials (ASTM). 1990. Standard method for wood preservatives by laboratory soil- block cultures D 1413. Annual Book of ASTM Standards. 4. ASTM, West Conshohockon, PA, 215-221.

2.Clemons, C.M., and Ibach, R.E. 2002. Laboratory Test on Fungal Resistance of Wood Filled Polypropylene composites. Annual Technical Conference, 2: 2219-2221.

3.Kuan, H.Ch., Hung, J.M., M.Ma, Ch.Ch., and Wang, F.Y. 2003. Processability, Morphology and Mechanical Properties of Wood Flour Reinforced High Density Polyethylene Composites.Plastics, Rubber and Composites. 32, 3: 122-125.

4.Lopez, J.L., Cooper, P.A., and Sain, M. 2005.Evaluation of Proposed Test Methods to Determine Decay Resistance of Natural Fiber Plastic Composites. Forest Products Journal. 55, 12: 95-98.

5.Mankowski, M., & et al. 2005. Durability of Wood-Plastic Composite Relative to Natural Weathering and Preservative with Zinc Borate. 36th IRG Conference Bangalore, India 24-28 April.:12pp.

6.Oksman, K. and Clemons, C. 1998. Mechanical Properties and Morphology of Impact Modified Polypropylene-Wood Flour Composites, J. Appl.Poly.Sci.,67: 1503-1513.

7.Oksman, K., and Lindberg, H. 1995. Interaction between wood and synthetic polymers, Holzforschung, 49, 249-254.

8.Omidvar, A.1996. The Influence of Moisture Content on Treatability of Red Maple Wood. Ph.D thesis. The University of New Brunswick, 28-109.

9.Pendleton, D.E., Hoffard, Th. A., Adcock, T., Woodward, B., and Wolcott, M.P. 2002. Durability of an Extruded HDPE/WOOD Composite. Forest Products Journal. 52, 6.

10.Stark, N.M., and Rowlands, R.E. 2003. Effects of Wood Fiber Characteristics on Mechanical Properties of Wood/Polypropylene Composites.Wood and Fiber Science. 35, 2, 167-174.

11.Stark, N.M., and Matuana, L.M. 2007. Characterization of Weathered Wood-Plastic Composite Surface Using FTIR Spectroscopy, Contact Angle and XPS. Polymer Degradation and Stability. 92, 1883-1890.

12.Tomoyuki, F., and Te-Fu, Q.2002.Microscopic Study on the Composites of Wood and Polypropylene. Bulletin of FFPRT. 1:1, 115-122.

13.Viksne, A., Rence, L., and Berzina, R.2003. Influence of Modifiers on thePhysicomechanical Properties of Sawdust-Polyethylene Composites.Mechanics ofComposite Materials. 40:2, 169-177.