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Aging mechanism of wood-plastic composite was: light and heat break down the long molecular chains of wood flour and plastic; the free radicals reacted with the oxygen, which generated carbonyl groups, hydroperoxides and so on; the free radicals also had cross linking reaction, which generated alkoxy; Water destroyed the interface of wood flour and plastic, hydrolyzed ester additives, extracted the small molecule additives and degradation products; Microorganism degraded cellulose, semicellulose, lignin and ester additives; degradation product from different component accelerated the aging, which could be exampled by the fact that HCl from degradation of PVC accelerated the hydrolyzation of cellulose and semicellulose.
木塑復(fù)合材料的老化機(jī)理為:光和熱引發(fā)木塑復(fù)合材料中木質(zhì)組分和塑料組分大分子鏈斷裂欧美亚洲日本高清不卡,產(chǎn)生的自由基與氧氣作用www.淫荡网,發(fā)生鏈支化反應(yīng)生成羰基、氫過氧化物等0808贵妃网理论片,發(fā)生交聯(lián)反應(yīng)生成烷氧基等sese96;水分破壞木-塑界面啊啊啊用力插好舒服国产视频、水解酯類添加劑、抽提小分子添加劑和降解產(chǎn)物自拍网色;微生物分解纖維素一九九精品在线免费观看视频、半纖維素、木素和酯類添加劑玖玖视频网;木塑復(fù)合材料中各組分的降解產(chǎn)物相互促進(jìn)老化91看片午夜在线影院,PVC降解產(chǎn)生的HCl溶于水,促進(jìn)了纖維素和半纖維素的水解孕妇激情视频片。
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Pastijn left the question open whether is a congruence on the free idempotent semiring generated by two free generators. In this paper, the open question will be solved.
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In that shoreless ocean, at thy silently listening smile my songs would swell in melodies, free as waves, free from all bondage of words.
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In that shoreless ocean, at thy silently listening smile my songs would swell in melodies, free as waves, free from all bondage of words.
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By making theoretical analysis on vibration characteristics of a single slab and multi ones set in the inverted arch ring, four processes about stability failure, that is free vibration, locking, sleeking and distortion are proposed on the condition that water sealing was damaged and anchor-hold was out of action, a formula of the slab's maximum free displacement and dynamic equations in each process are obtained.
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This is how the star spangled banner was meant to be flown on the end of a pole of its own, free to wave majestically in our own free air.
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And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.
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Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.
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Hey Big Raven, The individual lies dont matter anymore - its ALL a tissue of lies in support of...
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