本文主要研究内容
作者刘小祥（2019）在《聚氨酯泡芯相变夹层复合材料的制备与性能研究》一文中研究指出：在节能降耗趋势下,新型材料逐渐向轻量化、高性能化和环保化方向发展。夹芯复合材料具有比强度高、比刚度高、吸能减振和隔音隔热等优势,在航空、建筑和民用基础等领域均有较高应用价值。本研究以玻璃纤维增强聚氨酯(GF/PU)复合材料为上下面层,聚氨酯硬泡(PUR)为芯层,并采用结构肋辅助连接,以提升力学性能,较传统夹层复合材料的胶接或机械连接方式制备工艺简便,强度可靠性更高;然后利用芯层PUR携带二氧化硅包覆相变温度为28℃的十八烷微胶囊相变粒子(MEPCMs),形成MEPCMs/PUR芯层,一体化成型制备夹层结构复合材料并赋予其调温控温功能。主要内容及结论如下:1.采用预聚体法制备面层GF/PU复合材料,当预聚体合成温度为50℃,异氰酸酯—NCO%含量为10%,玻璃纤维(GF)含量为55 wt%时综合性能最优,拉伸强度、弯曲强度和冲击韧性分别为794 MPa、846 MPa和228 kJ/m~2,损耗因子tanδ为0.59;采用环保型物理发泡剂正戊烷制备PUR硬泡芯层,当发泡剂用量为6 wt%时,压缩比强度为15.1,泡孔性能最优。2.在面层GF/PU复合材料和PUR最优工艺基础上,一体化成型制备夹芯结构复合材料,并设计肋结构以提升力学性能,其中采用四周、横向和纵向设计的肋结构性能最优,较无肋夹芯复合材料的抗弯曲和抗剪切性能提高近3倍;在5.9 kN的极限载荷时,仅6 mm挠度的变形,夹层结构复合材料的强度可靠性高。3.采用化学沉淀法制备微胶囊相变粒子(MEPCMs),重点研究了芯层十八烷/壳层硅源用料比例和乳化剂用量对相变焓值及形貌影响。芯层和硅源用料比例为1:2.5,乳化剂用量为15 wt%时,MEPCMs的熔融和结晶焓值最优,熔融焓105.4 J/g,熔融温度31.9℃,结晶焓106.8 J/g,结晶温度23.1℃,包覆率为48.1%,且有清晰的微胶囊球形轮廓。MEPCMs热稳定性较纯十八烷的初始分解温度提升近30℃,150℃时开始分解,300℃完全失重,有效提升相变材料的热稳定性。4.添加MEPCMs粒子于PUR中提高其相变焓值,添加量对发泡料体系黏度有较大影响,甚至发泡失效;MEPCMs添加量为50 wt%时最适宜,在不影响发泡工艺的前提下,且有较高相变焓值,熔融焓和结晶焓分别为56.3 J/g和53.1J/g,在此工艺参数下,PUR有效携带MEPCMs制备夹层复合材料的芯层。5.采用四周、横向和纵向的肋结构设计,在芯层PUR中添加50wt%MEPCMs后对夹层复合材料的力学性能影响较小。对泡芯相变夹层复合材料进行调温控温效率测试,在升温过程中,使环境温度维持在28℃以内的时间为1110 s,较未添加的夹层复合材料提高3倍;降温过程中,使环境温度维持在28℃以上的时长为1470 s,控温效果优异,这种新型结构材料兼具轻质高强的性能和调温控温的功能。
Abstract
zai jie neng jiang hao qu shi xia ,xin xing cai liao zhu jian xiang qing liang hua 、gao xing neng hua he huan bao hua fang xiang fa zhan 。ga xin fu ge cai liao ju you bi jiang du gao 、bi gang du gao 、xi neng jian zhen he ge yin ge re deng you shi ,zai hang kong 、jian zhu he min yong ji chu deng ling yu jun you jiao gao ying yong jia zhi 。ben yan jiu yi bo li qian wei zeng jiang ju an zhi (GF/PU)fu ge cai liao wei shang xia mian ceng ,ju an zhi ying pao (PUR)wei xin ceng ,bing cai yong jie gou le fu zhu lian jie ,yi di sheng li xue xing neng ,jiao chuan tong ga ceng fu ge cai liao de jiao jie huo ji xie lian jie fang shi zhi bei gong yi jian bian ,jiang du ke kao xing geng gao ;ran hou li yong xin ceng PURxie dai er yang hua gui bao fu xiang bian wen du wei 28℃de shi ba wan wei jiao nang xiang bian li zi (MEPCMs),xing cheng MEPCMs/PURxin ceng ,yi ti hua cheng xing zhi bei ga ceng jie gou fu ge cai liao bing fu yu ji diao wen kong wen gong neng 。zhu yao nei rong ji jie lun ru xia :1.cai yong yu ju ti fa zhi bei mian ceng GF/PUfu ge cai liao ,dang yu ju ti ge cheng wen du wei 50℃,yi qing suan zhi —NCO%han liang wei 10%,bo li qian wei (GF)han liang wei 55 wt%shi zeng ge xing neng zui you ,la shen jiang du 、wan qu jiang du he chong ji ren xing fen bie wei 794 MPa、846 MPahe 228 kJ/m~2,sun hao yin zi tanδwei 0.59;cai yong huan bao xing wu li fa pao ji zheng wu wan zhi bei PURying pao xin ceng ,dang fa pao ji yong liang wei 6 wt%shi ,ya su bi jiang du wei 15.1,pao kong xing neng zui you 。2.zai mian ceng GF/PUfu ge cai liao he PURzui you gong yi ji chu shang ,yi ti hua cheng xing zhi bei ga xin jie gou fu ge cai liao ,bing she ji le jie gou yi di sheng li xue xing neng ,ji zhong cai yong si zhou 、heng xiang he zong xiang she ji de le jie gou xing neng zui you ,jiao mo le ga xin fu ge cai liao de kang wan qu he kang jian qie xing neng di gao jin 3bei ;zai 5.9 kNde ji xian zai he shi ,jin 6 mmnao du de bian xing ,ga ceng jie gou fu ge cai liao de jiang du ke kao xing gao 。3.cai yong hua xue chen dian fa zhi bei wei jiao nang xiang bian li zi (MEPCMs),chong dian yan jiu le xin ceng shi ba wan /ke ceng gui yuan yong liao bi li he ru hua ji yong liang dui xiang bian han zhi ji xing mao ying xiang 。xin ceng he gui yuan yong liao bi li wei 1:2.5,ru hua ji yong liang wei 15 wt%shi ,MEPCMsde rong rong he jie jing han zhi zui you ,rong rong han 105.4 J/g,rong rong wen du 31.9℃,jie jing han 106.8 J/g,jie jing wen du 23.1℃,bao fu lv wei 48.1%,ju you qing xi de wei jiao nang qiu xing lun kuo 。MEPCMsre wen ding xing jiao chun shi ba wan de chu shi fen jie wen du di sheng jin 30℃,150℃shi kai shi fen jie ,300℃wan quan shi chong ,you xiao di sheng xiang bian cai liao de re wen ding xing 。4.tian jia MEPCMsli zi yu PURzhong di gao ji xiang bian han zhi ,tian jia liang dui fa pao liao ti ji nian du you jiao da ying xiang ,shen zhi fa pao shi xiao ;MEPCMstian jia liang wei 50 wt%shi zui kuo yi ,zai bu ying xiang fa pao gong yi de qian di xia ,ju you jiao gao xiang bian han zhi ,rong rong han he jie jing han fen bie wei 56.3 J/ghe 53.1J/g,zai ci gong yi can shu xia ,PURyou xiao xie dai MEPCMszhi bei ga ceng fu ge cai liao de xin ceng 。5.cai yong si zhou 、heng xiang he zong xiang de le jie gou she ji ,zai xin ceng PURzhong tian jia 50wt%MEPCMshou dui ga ceng fu ge cai liao de li xue xing neng ying xiang jiao xiao 。dui pao xin xiang bian ga ceng fu ge cai liao jin hang diao wen kong wen xiao lv ce shi ,zai sheng wen guo cheng zhong ,shi huan jing wen du wei chi zai 28℃yi nei de shi jian wei 1110 s,jiao wei tian jia de ga ceng fu ge cai liao di gao 3bei ;jiang wen guo cheng zhong ,shi huan jing wen du wei chi zai 28℃yi shang de shi chang wei 1470 s,kong wen xiao guo you yi ,zhe chong xin xing jie gou cai liao jian ju qing zhi gao jiang de xing neng he diao wen kong wen de gong neng 。
论文参考文献
论文详细介绍
论文作者分别是来自重庆理工大学的刘小祥，发表于刊物重庆理工大学2019-07-16论文，是一篇关于聚氨酯论文,夹层复合材料论文,相变材料论文,轻量化论文,调温控温论文,重庆理工大学2019-07-16论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自重庆理工大学2019-07-16论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：聚氨酯论文; 夹层复合材料论文; 相变材料论文; 轻量化论文; 调温控温论文; 重庆理工大学2019-07-16论文;