九号彩票注册

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UV膠水收縮起因和解決方法

水固化后的收縮起因和解決方法
紫外光固化膠黏劑(UV-固化膠黏劑,簡稱UV-膠黏劑)由于固化速度快、無溶劑、生產效率高、節省能源等優點而日益受到重視,因而近10年來發展十分迅速。近年來國際上UV-固化膠黏劑的用量以每年20%的速度增長,國內由于電子工業和其他制造業的快速發展,UV-固化膠黏劑的用量增長更快。

UVJIAONIANJIANGUHUAFANYINGFENWEIZIYOUJIXINGHEYANGLIZIXING,MUQIANDE95%YISHANGSHIBINGXISUANZHIZIYOUJIXING,QITEDIANSHIGUHUAGUOCHENGZHONGTIJISHOUSUOLVYIBANBIJIAODA。YOUYUJIAONIANJISHIYONGSHISHEJIDAOLIANGGEBEIZHANJIEMIAN,XIANGBIYUTULIAO、YOUMODENGUV-CAILIAO,GUHUAGUOCHENGZHONGYOUYUSHOUSUOCHANSHENGDEYINGLIHETIJISHANGDEQUEXIANGENGJIANANYIXIAOCHU,SUOYIDUIJIANGDISHOUSUOLVDEYAOQIUGENGGAO。TIJISHOUSUODECHANSHENGBUDANYINGXIANGZHANJIEDECHICUNJINGDU,ERQIEHUIZHIJIEDAOZHIZHANJIELIXIAJIANG。DUIYUGANGXINGCAILIAODEZHANJIE,RONGYICHANSHENGWENZHUANGKONGXISHENZHIKAILIE,DUIYUROUXINGCAILIAORONGYICHANSHENGQIAOQUBIANXING。SUOYIJIANGDISHENZHIXIAOCHUGUHUAGUOCHENGZHONGDETIJISHOUSUO,DUIYUTIGAOZHANJIEDECHICUNJINGDUHEZHANJIEQIANGDU,KUOZHANUV-JIAONIANJIDESHIYONGFANWEI,JUYOUZHONGYAOYIYI。BENWENFENXITAOLUNLEUV-JIAONIANJITIJISHOUSUODECHANSHENGYUANYIN、YINGXIANGYINSU、YANJIUFANGFAYIJISHOUSUOLVHESHOUSUOYINGLIDEGUANXI,YIQIZHENDUIBUTONGDESHIYONGXUQIU,ZHAODAOJIANGDISHOUSUOLVDEYOUXIAOFANGFA。

九号彩票注册 1 SHOUSUOLVCHANSHENGJILI

UV-JIAONIANJIGUHUAGUOCHENGZHONGCHANSHENGDETIJISHOUSUO,YUANYINZAIYUGUHUAGUOCHENGYUANZIJIANDEPAILIEDEJINMICHENGDUDEBIANHUA。QIZHONGZHUYAOYUANYINSHIGUHUAGUOCHENGZHONGJUHEFANYINGDAILAIDEYUANZIJIANDEJULIDEBIANHUA,QICISHICONGDANTIDAOJUHEWUGUOCHENGZHONGCHANSHENGDESHANGDEBIANHUA,JIZIYOUTIJIDEBIANHUA。YOUYUUVJIAONIANJIREPENGZHANGXISHUZAI10-4DESHULIANGJI,SUOYIYOUYUREZHANGLENGSUODAILAIDETIJIBIANHUAHENXIAO,ZHELIBUZUOTAOLUN。

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九号彩票注册 YANGLIZIXINGUVJIAONIANJIDECAIYONGDEDANTIYIBANSHIHUANYANGHUAHEWUHUOYIXIJIMILEI(TU3)。YIXIJIMILEIGUHUASUDUJIAOMAN,YINGYONGBURUHUANYANGLEIGUANGFAN。HUANYANGLEIHUAHEWUDEGUHUAJILISHIZAIYANGLIZIGUANGYINFAJIDECUNZAIXIAFASHENGKAIHUANJUHEFANYING。CONGTU2(b)KEYIKANCHU,HUANYANGHUAHEWUKAIHUANJUHESHI,YIFANGMIANHUANYANGDANTIJIANDEJULIYOUGUHUAQIANDEFANDEHUAJULIBIANWEIGUHUAHOUDEGONGJIAJIANJULI,ZHEYIGUOCHENGZAOCHENGTIJISHOUSUO;LINGYIFANGMIANHUANYANGDANTIJUHESHIDANTISHANGDEHUANDAKAI,FENZINEIDEGONGJIAJIANJULIBIANCHENGLEISIYUFENZIJIANDEFANDEHUAJULI,DAOZHITIJIPENGZHANG,BUFENDIXIAOLECHENGJIANDAILAIDETIJISHOUSUO。ERZHEDEZONGJIEGUOSHISHIHUANYANGHUAHEWUGUHUAHOUTIJIYOUSHAOLIANGSHOUSUO,DANQISHOUSUOLVYUANXIAOYUBINGXISUANZHIZIYOUJIJUHEFANYING。

JUHEGUOCHENGDELINGYIGETIJIBIANHUAYINSUSHICONGDANTIDAOJUHEWUDESHANGDEBIANHUA,YEJIUSHIDANTIDAOXIANGYINGDEJUHEWUDEZIYOUTIJIDEBIANHUA,JIDANTIHEJUHEWUZHONGFENZIDUIJIMIDUDEBIANHUA。YOUYUFENZIZAIJUHEWUZHONGBUWANQUANJINMIDUIQI,FENZIZHIJIANCUNZAIZHUZIYOUTIJI。GUANGGUHUAQIANYETAIDANTIFENZICHUYUSONGSANDEZIYOUHUODONGZHUANGTAI,ZIYOUTIJIJIAODA。GUANGGUHUAHOUBINGXISUANZHIDANTISHENGCHENGSANWEIWANGZHUANGJIAOLIANDEJUHEWU,QIFENZIJIANJIAOLIANDIANDUO,MINGXIANDEXIANZHILELIANDUANDEYUNDONG,ZIYOUTIJIBIANXIAO,CONGERYEDAILAITIJISHOUSUO。

2 SHOUSUOLVDEYINGXIANGYINSU

2.1 GUANNENGTUANDEHANLIANG

九号彩票注册 UV-JIAONIANJIDETIJISHOUSUO,ZHUYAOYUANYINZAIYUGUHUAGUOCHENGZHONGJUHEFANYINGDAILAIDEYUANZIJIANDEJULIDEBIANHUA,SUOYIUVJIAODESHOUSUOLVDEDAXIAOZHUYAOQUJUEYUJIAOLIANMIDU,JIAOLIANMIDUYUEDA,SHOUSUOLVYUEGAO。DUIYUZIYOUJIXINGUVJIAO,BINGXISUANZHIJIDEHANLIANGSHIQIJUEDINGYINSU.BIAO1GEICHULEYIXIECHANGYONGYETAIDANGUANNENGBINGXISUANZHIDANTIDEXIANGDUIFENZIZHILIANGHESHOUSUOLV。KEYIKANCHU,SUIZHUXIANGDUIFENZIZHILIANGDEZENGDA,BINGXISUANZHIJIHANLIANGDEJIANGDI,DUOSHUCHENGSHOUSUOLVJIANGDIDEQUSHI。QIZHONGBINGXISUANYIBINGPIANZHIDESHOUSUOLVZUIDI,WEI8.2%。

九号彩票注册 BIAO2LIECHULEDUOGUANNENGDANTIDEJUNJUWUHEGONGJUWUSHOUSUOLV。QIZHONGGONGJUWUDEZUCHENGJIANBIAO3。CONGBIAO2ZHONGKEYIKANCHU,ZAIXIANGJINDEXIANGDUIFENZIZHILIANGQINGKUANGXIA,WULUNDUOSUOYIERCHUNERBINGXISUANZHIHUANSHIWANJIERYUANCHUNDEERBINGXISUANZHI,JUNJUWUDOUBIAOXIANCHUBIJIAOJIEJINDESHOUSUOLV,QIESUIZHUXIANGDUIFENZIZHILIANGDEZENGJIA,SHOUSUOLVJIANGDI。DANZAIGONGJUWUZHONG,WANJIERYUANCHUNERBINGXISUANZHIBIAOXIANCHUGENGDIDESHOUSUOLV。QIYUANYINKENENGZAIYUGONGJUGUOCHENGZHONGWANJIERYUANCHUNERBINGXISUANZHIZIYOUTIJIDEBIANHUABIYIERCHUNERBINGXISUANZHIDEYAOXIAO。

BINGXISUANZHIDIJUWUYOUYUXIANGDUIFENZIZHILIANGJIAODA,GUANNENGTUANHANLIANGJIAODI,SUOYISHOUSUOLVYIBANJIAODI。JUANZHIBINGXISUANZHIDESHOUSUOLVYIBANDIYUHUANYANGBINGXISUANZHI,ERQIEFENZIDEROURENXINGGENGRONGYISHEJIHEDIAOJIE,SUOYIJUANZHIBINGXISUANZHIBIHUANYANGBINGXISUANZHIGENGCHANGYONGYIXIE。

九号彩票注册 2.2 FENZIDEJIEGOUDEGUIZHENGCHENGDU

FENZIDEJIEGOUDEGUIZHENGCHENGDUDUIJUHEGUOCHENGDESHOUSUOLVYEYOUJIAODAYINGXIANG。DUIYUZHILIANXINGDEFENZIJIEGOU,TIJISHOUSUOJINSIZHENGBIYUDANWEITIJINEIDANTIFENZISHUMU。ZHILIANXINGDEHUOBUGUIZEDEDANTIFENZIZEBUFUHEZHEGEGUILV,ZAIJUHEHOUDESHOUSUOLVYEBIJIAOXIAO。ZAIBIAO1ZHONGJUYOUSANGEHUANZHUANGJIEGOUDEBINGXISUANYIBINGPIANZHI(IBOA)SUIRANSHUANGJIANHANLIANGGAOYUBINGXISUANERHUANWUJIYANGYIZHI,DANQISHOUSUOLVQUEXIAOYUHOUZHE。ZAIBIAO2ZHONG,NPGDAWULUNZAIJUNJUWUHUANSHIZAIGONGJUWUZHONGDOUBIAOXIANCHUBIJIAODIDESHOUSUOLV(10.8%),YUANDIYUXIANGJINXIANGDUIFENZIZHILIANGDEZHILIANXINGDEERBINGXISUANZHI(13%~14%)。QIYUANYINKENENGSHIIBOAHENPGDADEBUGUIZEJIEGOUJIANGDILEFENZIDEPAILIEGUIZECHENGDU,SHIDEZIYOUTIJIBIANDA。

九号彩票注册 3 SHOUSUOLVYANJIUFANGFA

JUHEWUDESHOUSUOLVDEYANJIUYIBANSHICEDINGGUHUAQIANHOUDETIJISHOUSUOLVHUOZHEXIANSHOUSUOLV,JINXINGDONGLIXUEFANGMIANDEYANJIUYIBANSHIGENZONGCEDINGSHUZHIGUHUAGUOCHENGZHONGDESHOUSUOLV。

九号彩票注册 TIJISHOUSUOLVDECEDINGFANGFA,KEYIANZHAOGUOJIBIAOZHUNISO3521ZHONGYOUGUANGUIDINGJINXING。YIZHONGFANGFASHICEDINGSHUZHIGUHUAQIANHOUDEMIDU,RANHOUGENJUMIDUJISUANSHOUSUOLV。SHOUSUOLV=(ρHOU-ρQIAN)/ρHOU×100%,QIZHONGρHOUHEρQIANFENBIESHIGUHUAHOUHEGUHUAQIANDEMIDU。GUHUAQIANHOUDEMIDUCEDINGKEYICAIYONGBIZHONGPINGFA,YISHUIWEICANBICEDING。YEYOURENYONGBIZHONGJICEDINGGUHUAQIANDEYETI,FULIFACEDINGGUHUAHOUGUTIDEMIDU。LINGYIZHONGFANGFASHI,CEDINGMOJUMOQIANGHEGUHUAHOUSHIYANGTIJIJISUANTIJISHOUSUOLV。WEIJIANSHAOXITONGWUCHAHEBUTONGFANGFADAILAIDEYINGXIANG,ZAICEDINGTIJISHOUSUOLVSHI,YINGCAIYONGXIANGTONGDETIJIHUOMIDUCEDINGDEFANGFA,SHISHUJUJUYOUKEBIXING。

XIANSHOUSUOLVSHIZHISHUZHIJIAOZHUTIZHONGXINXIANDUIYINGDELIANGGEDUANMIANJIANDEGUHUAQIANHOUCHANGDUCHAYUGUHUAQIANCHANGDUDEBIZHI。QICEDINGKEGENJUBUTONGYAOQIUFENBIECANZHAOISO2577REGUXINGMOSULIAOSHOUSUOFANGFA,YIJIASTMD2566DENGBIAOZHUN。WOGUOYOUGUOBIAOGB1404FENQUANSULIAOFENSHOUSUOLVSHIYANFANGFA,DANZHEXIEFANGFADOUSHIZHENDUIREGUHUASHUZHIJIANLIDEBIAOZHUN。UVSHUZHIGUHUA,SHIYOUWAIXIANGLIDEBUJUNYUNGUHUAGUOCHENG,SUOYIZHEXIEFANGFARONGYICHANSHENGBUGUIZEBIANXING,RUZAIASTMD2566ZHONGSHUZHIXIANSHOUSUOLVDESHIYONGYIGEBANYUANXINGDECAO,YONGJUSIFUYIXIMOPUZAICAODEBIAOMIANSHANG,CEDINGDUANMIANDECHANGDUBIANHUA,GUHUAGUOCHENGZHONGNANYIBAOZHENGBUGUIZEXINGBIAN。JINNIANLAIYOURENGENJUSHUZHIGUANGGUHUAGUOCHENGDETEDIAN,SHEJIYUANTONGXINGMOJU。GUHUASHI,MOJUZHILIXUANZHUAN,SHANGDUANXIANDANGGUANG,DAIZHUTIJIBENGUHUAWANQUANHOU,ZAIGUHUASHANGDUAN。ZHEYANGKEYIXIAOCHUSHUZHIDEBUGUIZEBIANXING,BINGBAOCHILIANGHAODECEDINGZHUNQUEDU。

九号彩票注册 SHUZHIGUHUAGUOCHENGDESHOUSUOLVGENZONGJIANCEKEYIYONGPENGZHANGJILAIJINXING。PENGZHANGJIFACHANGQIYILAIYIZHISHIYANJIUJUHEFANYINGDONGLIXUEDEFANGFA,KEYONGYUSHISHIJIANCEGUOGUHUAGUOCHENG。ZAOQIDEPENGZHANGJIBUSHIHEYANJIUJUHEFANYINGDEQUANGUOCHENGHUOYOUZAOQININGJIAOHUAFANYINGDETIXI。WEIKEFUZHEXIEQUEDIAN,CENGZAIPENGZHANGJIDEJIEGOUSHANGZUOGUOXUDUOGAIJIN。L.C.RubensBAODAOGUOYIZHONGSHIHEYUYANJIUGUANGJUHEDEPENGZHANGJI,QIZHUYAOGAIJINSHIBADANTIZHUANGRUJUFUYIXIBOMODAIZHONG,ZHEYANGKEYIKEFUYOUYUZHANDUDATIXINEIBUCHUXIANQIPAOHUOLIEXIYIJIJUHESULVHENDASHINANYIBAOCHIHENGWENDENGQUEDIAN。ZAICIJICHUSHANG,YEYOURENSHEJILEZIDONGJILUSHIPENGZHANGJIYONGYUGUANGGUHUAFANYINGDEJIANCE,ZHEZHONGPENGZHANGJIYANJIUMMADEGUANGJUHEGUOCHENG,YUZHILIANGFAXIANGBI,QIWUCHAZAI±2%。

4 SHOUSUOLVYUSHOUSUOYINGLIDEGUANXI

ZAIUVJIAONIANJIDEGUHUAGUOCHENGZHONG,CUNZAIZHUNINGJIAOHUADEGUOCHENG。NINGJIAOHUAZHIQIAN,TIXISUIYOUSHOUSUO,DANRENGJUYOULIUDONGXING,ERNINGJIAOHUAZHIHOU,FENZIYUNDONGSHOUDAOLEZUAI,JINYIBUDEGUHUAFANYINGSHIZAOCHENGSHOUSUOYINGLIDEZHUYAOYUANYIN。SUOYISHOUSUOYINGLIBINGBUZHENGBIYUZHENGGEGUHUAGUOCHENGDETIJISHOUSUOLV。ERSHIQUJUEYUNINGJIAOHUAZHIHOUDETIJISHOUSUOLV。FANYINGWUDEGUANNENGDUYUEGAO,FASHENGNINGJIAOHUASHI,GUANNENGTUANDEFANYINGCHENGDUYUEDI。YINCI,GUANNENGDUGAODEFANYINGTIXI,ZAIGUHUAZHIHOUJIANGCHANSHENGJIAOGAODESHOUSUOYINGLI。

SHOUSUOLVYUSHOUSUOYINGLIYOUZHUXIANGTONGDEBIANHUAQUSHI,DANBINGBUCHENGZHENGBI。PANGZHENGZHIDENGRENCAIYONGMANSHESHIPIANZHENGUANGDANYICEDINGLEGUANGGUHUATUCENGYUJICAIDESHOUSUOYINGLI,JIEHEGUANGGUHUATIJIDECEDING,YANJIULEBINGXISUANZHIDANTIGUANNENGDUJIJIEGOUDUIQITUCENGSHOUSUOYINGLIJITIJISHOUSUOLVDEYINGXIANGGUILV。JIEGUOBIAOMING(BIAO4)SUIZHUGUANNENGDUDETIGAO,GUANGGUHUATIJISHOUSUOLVHEXIANGDUINEIYINGLIDOUCHENGZENGJIAQUSHI,DANERZHEMEIYOUCHENGXIANZHENGBIGUANXI。

5 JIANGDISHOUSUOLVDEFANGFA

5.1 XUANYONGDISHOUSUOLVDANTIHEDIJUWUDI

GENJUSHOUSUOLVDECHANSHENGYUANLI,ZAIJIAONIANJIDEPEIFANGZHONGCAIYONGDISHOUSUODEDAIYOUZHILIANHUOHUANZHUANGJIEGOUDEDANTIHEDIJUWU,KEYIYOUXIAODIJIANGDIGUHUASHOUSUOLV,SUOYIERGUANNENGHESANGUANNENGDEDANTIJINGUANZAITULIAOZHONGHENCHANGYONG,DANZAIUVJIAONIANJIZHONG,XISHIDANTIYIBANYIDANGUANNENGDANTIWEIZHU。DANLINGYIFANGMIAN,GUODUODECAIYONGDIGUANNENGDUDEDANTI,CHANGCHANGHUIJIANGDIJIAOLIANMIDU,SHIDEJIAONIANJIDENAIRONGJIXINGNENGXIAJIANG,SUOYIZAISHIJIYINGYONGZHONGYINGJIANGUJIAOLIANMIDUDEWENTI。ZAIERGUANNENGDANTIZHONG,NPGDAHUOWANYANGJIHUADENPGDAYOUBIJIAODIDESHOUSUOLVYOUNENGTIGONGHESHIDEJIAOLIANMIDU,ZAIJIANGDISHOUSUOLVFANGMIANYOUYUQITAERGUANNENGDANTI。

XUANYONGDINIANDUBINGXISUANZHIDIJUWU,SHAOYONGXISHIDANTI,YESHIJIANGDISHOUSUOLVDEYOUXIAOTUJING。

5.2 TIANJIAJUHEWUHUOWUJIWUTIANLIAO

ZHELIANGZHONGFANGFADOUKEYIJIANGDITIXIZHONGGUANNENGTUANDEHANLIANG,CONGERJIANGDISHOUSUOLV。ZAIJIARUJUHEWUDEFANGFAZHONG,XINSHENGCHENGDETIXIHEYUJIARUDEGAOJUWUZHIJIANYOUSHIHUIZAIGUHUAGUOCHENGZHONGFASHENGXIANGFENLI,YEKEYIDIXIAOBUFENTIJISHOUSUO。DANZHEZHONGXIANGFENLIDEQUEDIANSHIHUIJIANGDIGUHUAWUDETOUMINGDU。JUBAODAO,ZIYOUJIJUHETIXIZHONGJIARUJUCUSUANYIXIZHI、JUYIXICHUNSUOQUAN、JUZHIDENGRESUXINGGAOFENZI,KESHITIJISHOUSUOLVXIANZHUJIANGDI。

九号彩票注册 JIARUDUOXINGDETIANLIAORUSHIYINGFENBOLIWEIQIUHUOBOLIXIANWEIDENG,YEKEJIANGDIGUHUASHOUSUO。KarrerDENGRENCAIYONGDUOKONGXINGJUBENYIXIHESHIYINGFENDUIGUANGGUHUASHUZHITIXIJINXINGGAIXING,SHUZHITIJISHOUSUOLVDADAO2%。ZHELIANGZHONGFANGFATONGCHANGHUIDAOZHIJIAONIANJIZHANDUZENGDA,JIANGDIGUHUASUDU,YINGXIANGGONGYIXING。

WEIKEFUYISHANGDEQUEDIAN,JUHEWUDEJIEGOUSHEJIYINGDAIYOUHUANZHUANGJIEGOUQIEXIANGDUIFENZIZHILIANGBUYITAIDA,BUYIXUANYONGCHANGGUIDERESUXINGSHUZHILEIXING。JUBAODAO,MEIGUODymaxGONGSICAIYONGGONGNENGHUADEXIANWEISUJIARUDAOUVJIAONIANJIZHONG,TONGSHIJIARUTIANLIAO,YOUXIAODIJIANGDILESHOUSUOLV,SHOUSUOLVDA0.05%~0.1%,DUIQITAXINGNENGBUDA。ZHEZHONGJIAONIANJIKEYONGYUGAOJINGDUBOLIYIQIDEZHANJIE。

九号彩票注册 5.3 CAIYONGYANGLIZIHUOHUNHEXINGGUHUAFANGFA

九号彩票注册 YANGLIZIXINGUVJIAO,CAIYONGDEDANTISHIHUANYANGSHUZHIHEYIXIJIMILEI,YIJINWENGYANWEIGUANGYINFAJI。YINHUANYANGSHUZHIDEYANGLIZIGUHUAFANYINGSHOUSUOLVYAOYUANDIYUZIYOUJIFANYINGDESHOUSUOLV,SUOYIKEYITONGGUOCAIYONGYANGLIZIXINGPEIFANGJIANGDIGUHUASHOUSUOLV。RUNorioDENGRENCAIYONGZHIHUANLEIHUANYANGWEIZHUTISHUZHIHEXISHIJI,YIWEIMIJIDEQIUZHUANGSHIYINGWEITIANLIAO,PEIZHIDEJIAONIANJIJUYOUJIAOHAODEZHANJIELI,QITIJISHOUSUOLVJINWEI1.2%,ZAISHIWENXIA1~5minGUHUA,SHIYONGYUJINGMIGUANGXUEJIEGOUDEZHANJIE。DANYANGLIZIXINGJIAONIANJIDEGUHUASUDUYIBANBIJIAOMAN,RONGYISHOUJIANHESHIQIDEYINGXIANG,QIEQIJUWUHEXISHIJIDEZHONGLEISHAO、YUANLIAOCHENGBENBIJIAOGAO。SUOYIMUQIANDEUVJIAONIANJIRENGYIZIYOUJIXINGWEIZHU,ZHAN95%YISHANG。

HUNHEXINGUVJIAONIANJISHIZIYOUJIXINGHEYANGLIZIXINGDEHUNHETIXI,TONGCHANGCAIYONGDESHIBINGXISUANZHIHEHUANYANGHUAHEWUHUNHEXINGSHI。ZHEZHONGHUNZAUVGUHUATIXIZAIGUANGYINFASHI,KEYITIGAOYINFAXIAOLV,CHONGFENFAHUILIANGZHEDEYOUDIAN,JIANXIAOTIJISHOUSUO,ZAIQITAXINGNENGFANGMIANYEJUYOUHENHAODEXIETONGXIAOYING。

LINGWAI,GENJUGONGYIYAOQIU,YEKECAIYONGUVYUQITAGUHUAFANGFAFUHE,RUUVYUREGUHUAHUOYANYANGXINGGUHUADEFUHEFANGFA,YEKEYIJIANGDIGUHUASHOUSUOLV。

九号彩票注册 5.4 TIANJIAPENGZHANGLEIDANTI

從陽離子聚合反應已經知道,開環聚合反應比加聚反應體積收縮率較小。對于單環單體,每有一個范德華距離轉化為共價鍵距離,就有一個共價距離轉變成范德華距離。由此產生的收縮和膨脹可以部分抵消。進一步的研究發現,開環聚合反應體積收縮大小與環的大小有關。隨著環增大,碳氧原子間打開共價鍵后,其距離越來越接近范氏距離,體積收縮因而減小。對于雙環單體,由于發生雙開環聚合反應,有兩個單鍵斷裂變為近范德華距離,有可能使聚合后體積收縮更小,不收縮甚至膨脹。另外,在開環的同時,體系的熵也變大,即自由體積變大。目前為止,已發現的膨脹單體都遵循這一開環聚合反應的機理。研究較多的膨脹類單體基本是螺環化合物,如螺環原酸酯(SOE)、雙環原酸酯(BOE)、螺環原碳酸酯(SOC)及環內酯,它們可以按陽離子和自由基等多種反應機理聚合。如,潘才元等人合成的螺環類單體陽離子固化后體積膨脹率在10.4%,添加于環氧樹脂中取得了較好的降低固化收縮率的效果。目前,螺環類單體的成本很高,所以其實際應用仍然很少,但它卻是很有前途的一個消除收縮率的根本的方法。
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