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

نوع مقاله : مقاله کامل علمی 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
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