تاثير آلياژسازي رزين پلي استر غيراشباع با بوتيل اكريلات برچقرمگي ماتريس و خواص مكانيكي كامپوزيت الياف كنف و شيشه

Effect of Blending Butylacrylate with Unsaturated Polyester Resin on Toughness of Matrix and Mechanical Properties of Kenaf and Glass Fiber- based Composites

در اﯾﻦ ﺗﺤﻘﯿﻖ اﺛﺮ آﻣﯿﺨﺘﮕﯽ رزﯾﻦ ﭘﻠﯽاﺳﺘﺮﻏﯿﺮاﺷﺒﺎعارﺗﻮﻓﺘﺎﻟﯿﮏ ﺑﺎ ﻣﻮﻧﻮﻣﺮ ﺑﻮﺗﯿﻞ-اﮐﺮﯾﻼت ﺑﺮ ﭼﻘﺮﻣﮕﯽ اﯾﻦ آﻟﯿﺎژ و ﻫﻤﭽﻨﯿﻦ ﮐﺎﻣﭙﻮزﯾﺖ ﺳﺎﺧﺘﻪ ﺷﺪه ﺑﺎ آن ﺑﺮرﺳﯽﺷﺪه اﺳﺖ. در ﻓﺎز اول، آﻟﯿﺎژ ﻣﻮرد ﻧﻈﺮ ﺑﺎ دو ﺷﺮاﯾﻂ ﻣﺘﻔﺎوت و ﻫﺮ ﮐﺪام ﺑﺎ ﺗﺮﮐﯿﺐ درﺻﺪﻫﺎي 20 ،15 ،10 ،5 ،0 و 25 درﺻﺪ ﺑﻮﺗﯿﻞاﮐﺮﯾﻼت ﭘﺨﺖ و آﻣﺎده ﺳﺎزي ﺷﺪه اﺳﺖ. ﭘﺨﺖ ﺳﺮد ﺑﺎ ﮐﺎﺗﺎﻟﯿﺴﺖ ﻣﺘﯿﻞاﺗﯿﻞﮐﺘﻮن ﭘﺮاﮐﺴﯿﺪ و ﭘﺨﺖ ﮔﺮم ﺑﺎ ﮐﺎﺗﺎﻟﯿﺴﺖ ديﺑﻨﺰوﺋﯿﻞ-ﭘﺮاﮐﺴﯿﺪ. از آزﻣﻮن ﻣﻘﺎوﻣﺖ ﺑﻪ ﺿﺮﺑﻪ اﯾﺰود ﺑﺮاي ارزﯾﺎﺑﯽ ﻣﯿﺰان ﭼﻘﺮﻣﮕﯽ ﻧﻤﻮﻧﻪﻫﺎي آﻟﯿﺎژ ﺷﺪه اﺳﺘﻔﺎده ﺷﺪ. در ﻓﺎز دوم، از آﻟﯿﺎژ ﺑﺎ ﺑﺎﻻﺗﺮﯾﻦ ﻣﯿﺰان ﭼﻘﺮﻣﮕﯽ ﺑﻪ ﻋﻨﻮان ﻣﺎﺗﺮﯾﺲ ﺑﺮاي ﺳﺎﺧﺖ ﮐﺎﻣﭙﻮزﯾﺖﻫﺎي اﻟﯿﺎفﮐﻨﻒ و اﻟﯿﺎفﺷﯿﺸﻪ اﺳﺘﻔﺎده ﺷﺪ و ﺧﻮاص ﻣﮑﺎﻧﯿﮑﯽ آنﻫﺎ ﺷﺎﻣﻞ ﭼﻘﺮﻣﮕﯽ، اﻧﺮژي ﺷﮑﺴﺖ، اﺳﺘﺤﮑﺎم در ﻧﻘﻄﻪ ﺷﮑﺴﺖ، ﻣﺪول اﻻﺳﺘﯿﺴﯿﺘﻪ و دﻣﺎي اﻧﺤﻨﺎي ﺣﺮارﺗﯽ ﻣﻮرد ارزﯾﺎﺑﯽ ﻗﺮار ﮔﺮﻓﺖ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﺑﯿﺸﺘﺮﯾﻦ ﭼﻘﺮﻣﮕﯽ ﻣﺎﺗﺮﯾﺲ ﻣﺮﺑﻮط ﺑﻪ ﺳﻄﺢ 15درﺻﺪ ﺑﻮﺗﯿﻞاﮐﺮﯾﻼت در ﺳﯿﺴﺘﻢ ﭘﺨﺖ ﺳﺮد ﺑﺮاﺑﺮ ﺑﺎ 1/91 kJ/m2 ﻣﯽﺑﺎﺷﺪ. در ﻣﻘﺎﯾﺴﻪ ﺑﺎ ﮐﺎﻣﭙﻮزﯾﺖ ﺑﺎ ﻣﺎﺗﺮﯾﺲ ﭘﻠﯽاﺳﺘﺮﺧﺎﻟﺺ، ﭼﻘﺮﻣﮕﯽ در ﮐﺎﻣﭙﻮزﯾﺖ ﺑﺎ ﻣﺎﺗﺮﯾﺲ آﻟﯿﺎژ ﭘﻠﯽاﺳﺘﺮ ﺑﻪ ﻣﯿﺰان ﺣﺪود 31 درﺻﺪ اﻓﺰاﯾﺶ داﺷﺘﻪ اﺳﺖ. ﻧﺘﺎﯾﺞ ﻣﺪولاﻻﺳﺘﯿﺴﯿﺘﻪ ﮐﺎﻣﭙﻮزﯾﺖﻫﺎ ﻧﺸﺎن داد ﻣﺪولاﻻﺳﺘﯿﺴﯿﺘﻪ ﮐﺎﻣﭙﻮزﯾﺖ ﺑﺎ ﻣﺎﺗﺮﯾﺲ آﻟﯿﺎژ ﺷﺪه ﺑﺎ ﺑﻮﺗﯿﻞ اﮐﺮﯾﻼت ﺣﺪود 133 درﺻﺪ ﮐﻤﺘﺮ از ﻣﻘﺪار اﯾﻦ وﯾﮋﮔﯽ ﺑﺮاي ﮐﺎﻣﭙﻮزﯾﺖ ﺑﺎ ﻣﺎﺗﺮﯾﺲ ﭘﻠﯽ اﺳﺘﺮ ﺧﺎﻟﺺ ﻣﯽﺑﺎﺷﺪ. ﻫﻤﭽﻨﯿﻦ ﻣﺸﺨﺺ ﺷﺪ اﺳﺘﻔﺎده از ﻣﻮﻧﻮﻣﺮ ﺑﻮﺗﯿﻞاﮐﺮﯾﻼت ﺑﺎﻋﺚ ﮐﺎﻫﺶ اﺳﺘﺤﮑﺎم در ﻧﻘﻄﻪ ﺷﮑﺴﺖ و دﻣﺎي اﻧﺤﻨﺎي ﺣﺮارﺗﯽ ﮐﺎﻣﭙﻮزﯾﺖ ﻫﺎي اﻟﯿﺎف ﺷﯿﺸﻪ و ﮐﻨﻒ ﺑﺎ ﻣﺎﺗﺮﯾﺲ آﻟﯿﺎژ ﺷﺪه، ﮔﺮدﯾﺪه اﺳﺖ.

In this study, the effect of blending butyl acrylate with orthophthalic unsaturated polyester resin were investigated on toughness of the matrix and some mechanical properties of the composites with the same matrix. In the first phase, the blends, as matrix, have been fabricated by two different curing systems (cold cure with methyl ethyl ketone peroxide as catalyst, and hot cure with di-benzoyl peroxide as catalyst), each by combinations of 0, 5, 10, 15, 20 and 25 % monomeric butyl acrylate. Izod impact test was used to evaluate the toughness of blended matrix and pure matrix. In the second phase, kenaf and glass fiber-based composites were made by the blended matrix with the highest impact strength, then subjected to some mechanical tests such as toughness, failure energy, ultimate strength, modulus of elasticity, and heat deflection temperature. Test results showed that the highest value for impact strength, as 1.91 kJ m-2 was attained for cold curing system with 15% monomeric butyl acrylate. Impact strength or toughness of blended matrix/fiber composites was around 31% more than that of for pure polyester/fiber composites. In addition, modulus of elasticity of blended matrix reinforced by fibers was around 133% less than that of for pure polyester/fiber composites. Finally, the results showed that monomeric butyl acrylate had a negative effect on ultimate strength and heat deflection temperature of blended matrix/kenaf and glass fiber-based composites