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Good thermal stability and self-extinguishing behavior was observed with the cured polybenzoxazine resins. Second, furan-containing benzoxazine monomers, P-FBz, BPA-FBz, and 4FP-FBz were prepared using furfurylamine as a raw material. Formation of furfurylamine Mannich bridge networks in the polymerizations of P-FBz and BPA-FBz increased the cross-linking densities and thermal stability of the resulting polybenzoxazines. P-FBz and BPA-FBz- based polymers also exhibited high glass transition temperatures above 300℃, high char yields, and low flammability with a limited oxygen index value of 31. The dielectric (Dk3.21–3.39) and mechanical properties (high storage modulus of 3.0–3.9 GPa and low coefficient of thermal expansion of 37.7– 45.4 ppm) of the P-FBz and BPA-FBz-based polymers were superior or comparable to other polybenzoxazines. 4FP-FBz used for polybenzo- xazine modification by means of formation of benzoxazine hybridation with P-FBz.
第二部份以2-呋喃甲胺為起始物欧美一级做a影片爱橙影院,制備了P-FBz国产黄A一级毛片视频、4FP-FBz與BPA-FBz 三個(gè)含呋喃官能基之氧代氮代苯并環(huán)己烷的單體久久免费看一级毛片一级A片;BPA-FBz與P-FBz於開(kāi)環(huán)聚合中形成之Mannich bridge網(wǎng)狀結(jié)構(gòu)有效地提升聚氧代氮代苯并環(huán)己烷聚合物之交聯(lián)密度與熱安定性人人看人人干人人午夜;Poly與Poly具有大於300℃之玻璃轉(zhuǎn)移溫度无码色区、高的焦炭生成率與具有31之極限氧指數(shù)(Limited oxygen index爱情岛亚洲永久自拍品质, LOI)的難燃性特質(zhì),Poly與Poly之介電常數(shù)(Dk=3.21~3.39)與機(jī)械性質(zhì)[3.0~3.9 GPa的儲(chǔ)存模數(shù)與37.7~45.4ppm之低熱膨脹系數(shù)( Low coefficient of thermal expansion在线看黄色网站免费, Low CTE)]均較其他聚氧代氮代苯并環(huán)己烷為優(yōu)久久精品视频99;4FP-FBz具有低之介電常數(shù)(Dk=2.7),以其作為降低介電常數(shù)之反應(yīng)型改質(zhì)劑欧美精品网一区二区,與P-FBz混成免费A级毛片全免费还看,證實(shí)可有效地降低Poly的介電常數(shù)。
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It preparatorily discuss the relation between Heidegger'sthought and Aesthetics,consider the key to the ground and development of Aesthetics is the rela-tion between Truth and beauty.
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- 更多網(wǎng)絡(luò)解釋與部份性地相關(guān)的網(wǎng)絡(luò)解釋 [注:此內(nèi)容來(lái)源于網(wǎng)絡(luò)高清黄色在线视频一区二区,僅供參考]
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devastating quake:毀壞性震地
devastate 毀壞 | devastating quake 毀壞性震地 | dilapidated abode 部份毀壞的房屋
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dilapidated abode:部份毀壞的房屋
devastating quake 毀壞性震地 | dilapidated abode 部份毀壞的房屋 | earthquake belt 震地帶
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machete:砍刀
大砍刀 (machete)在過(guò)去幾世紀(jì)以來(lái),被認(rèn)為是堅(jiān)固耐用的求生工具. 利用它,你可以砍劈、剁切一级片aaa片、刨削,甚至是當(dāng)重錘敲擊免费看美国牲交毛片、或是挖土掘地的工具. 握把的部份,利用聚丙烯酸( polypropylene )樹(shù)酯模鑄而成,耐用性與防滑功能都非常得好.
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sectionalize:使具有地方性
sectionalism 地方主義 | sectionalize 使具有地方性 | sectionally 部份性地
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sectionally:部份性地
sectionalize 使具有地方性 | sectionally 部份性地 | sector entries 扇區(qū)項(xiàng)