差示掃描量(liang)熱(re)儀(yi)是(shi)壹(yi)種測(ce)量(liang)參(can)比端(duan)與(yu)樣(yang)品(pin)端(duan)的熱流(liu)差與(yu)溫(wen)度(du)參(can)數(shu)關(guan)系的熱分(fen)析(xi)儀(yi)器，主要(yao)應(ying)用(yong)於(yu)測量(liang)物(wu)質(zhi)加熱或冷卻(que)過程(cheng)中(zhong)的各(ge)種特(te)征參數(shu)：玻(bo)璃(li)化(hua)轉(zhuan)變溫度(du)Tg、氧(yang)化(hua)誘(you)導期OIT、熔融溫度(du)、結(jie)晶(jing)溫(wen)度(du)、比熱(re)容(rong)及熱(re)焓等(deng)。

主要特點:

1.全新(xin)的爐體結構，確保解析(xi)度(du)和(he)分(fen)辨(bian)率的基線(xian)穩定(ding)性

2.數字式(shi)氣體質(zhi)量(liang)流(liu)量(liang)計(ji)，控(kong)制(zhi)吹(chui)掃(sao)氣體流(liu)量(liang)，數(shu)據直接(jie)記(ji)錄(lu)在(zai)數(shu)據庫(ku)中

3.儀(yi)器可(ke)采用(yong)雙向控(kong)制(zhi)（主機控(kong)制(zhi)、軟(ruan)件(jian)控制），界(jie)面友(you)好，操(cao)作簡(jian)便

技術參數:

什(shen)麽(me)是(shi)玻璃(li)化(hua)轉(zhuan)變溫度(du)？

玻璃(li)化(hua)轉(zhuan)變是非(fei)晶(jing)態(tai)高(gao)分(fen)子(zi)材(cai)料(liao)（即(ji)非(fei)晶(jing)型聚(ju)合(he)物(wu)）固(gu)有(you)的性質(zhi)，是高分(fen)子(zi)運(yun)動(dong)形(xing)式(shi)轉變的宏觀體現，它直接(jie)影(ying)響(xiang)到(dao)材料(liao)的使(shi)用(yong)性能(neng)和(he)工藝(yi)性能(neng)，因(yin)此(ci)長期以來(lai)它都是高分(fen)子(zi)物(wu)理(li)研(yan)究的主要內容(rong)。

絕大多數聚(ju)合(he)物(wu)材(cai)料(liao)通(tong)常(chang)可(ke)處(chu)於(yu)以下(xia)三種物(wu)理(li)狀態(tai)(或稱(cheng)力(li)學狀態(tai)):玻(bo)璃(li)態(tai)、高(gao)彈(dan)態(tai)（橡(xiang)膠(jiao)態(tai)）和(he)粘流(liu)態(tai)。而(er)玻璃(li)化(hua)轉(zhuan)變則(ze)是高彈(dan)態(tai)和(he)玻(bo)璃(li)態(tai)之(zhi)間(jian)的轉變，從分(fen)子(zi)結(jie)構上(shang)講(jiang)，玻璃(li)化(hua)轉(zhuan)變溫度(du)是(shi)高(gao)聚(ju)物(wu)無(wu)定(ding)形(xing)部分(fen)從凍(dong)結(jie)狀(zhuang)態(tai)到(dao)解凍(dong)狀(zhuang)態(tai)的壹(yi)種松(song)弛現象(xiang)。

以DSC為例(li)，當溫(wen)度(du)逐(zhu)漸升高(gao)，通過高(gao)分(fen)子(zi)聚(ju)合(he)物(wu)的玻璃(li)化(hua)轉(zhuan)變溫度(du)時(shi)，DSC曲線(xian)上(shang)的基線(xian)向吸(xi)熱方(fang)向移(yi)動(dong)（見(jian)圖(tu)）。圖(tu)中A點是(shi)開始偏離(li)基線(xian)的點。將(jiang)轉(zhuan)變前後(hou)的基線(xian)延(yan)長，兩(liang)線(xian)之(zhi)間(jian)的垂直距(ju)離(li)為階差ΔJ，在(zai)ΔJ/2 處(chu)可(ke)以(yi)找(zhao)到(dao)C點，從C點作切線(xian)與(yu)前(qian)基(ji)線(xian)相交於(yu)B點，B點所(suo)對應的溫度(du)值(zhi)即(ji)為玻璃(li)化(hua)轉(zhuan)變溫度(du)Tg。

常(chang)見(jian)的結晶性塑(su)料(liao)有(you)：聚(ju)乙烯PE、聚(ju)丙烯PP、聚(ju)甲(jia)醛(quan)POM、聚(ju)酰(xian)胺PA6、聚(ju)酰(xian)胺PA66、PET、PBT等(deng)

非(fei)結(jie)晶塑(su)料(liao)有(you)：聚(ju)碳(tan)、ABS、透苯、氯乙烯等(deng)（如(ru)塑(su)料(liao)表殼、電(dian)視(shi)外(wai)殼(ke)等(deng)）

什(shen)麽(me)是(shi)氧(yang)化(hua)誘(you)導期？

氧(yang)化(hua)誘(you)導期（OIT）是測(ce)定(ding)試樣(yang)在(zai)高(gao)溫(wen)（200攝(she)氏度(du)）氧(yang)氣條件(jian)下(xia)開始發(fa)生自動(dong)催(cui)化(hua)氧(yang)化(hua)反應(ying)的時間(jian)，是評價(jia)材料(liao)在(zai)成(cheng)型(xing)加工、儲存、焊(han)接(jie)和使(shi)用(yong)中(zhong)耐(nai)熱(re)降解能(neng)力的指標。氧(yang)化(hua)誘(you)導期（簡(jian)稱(cheng)OIT）方(fang)法(fa)是(shi)壹(yi)種采用(yong)差(cha)熱(re)分(fen)析(xi)法(fa)（DTA）以(yi)塑料(liao)分(fen)子(zi)鏈斷(duan)裂(lie)時(shi)的放熱反應(ying)為依據，測試塑(su)料(liao)在(zai)高(gao)溫(wen)氧(yang)氣中(zhong)加速(su)老(lao)化(hua)程(cheng)度(du)的方(fang)法(fa)。其(qi)原理(li)是：將(jiang)塑(su)料(liao)試(shi)樣(yang)與(yu)惰性參(can)比物(wu)（如(ru)氧(yang)化(hua)鋁(lv)）置於(yu)差熱(re)分(fen)析(xi)儀(yi)中(zhong)，使(shi)其在(zai)壹(yi)定(ding)溫度(du)下(xia)用(yong)氧(yang)氣迅(xun)速(su)置(zhi)換(huan)試樣(yang)室(shi)內(nei)的惰性氣體（如氮氣）。測(ce)試(shi)由(you)於(yu)試樣(yang)氧(yang)化(hua)而(er)引起的DTA曲線(xian)（差(cha)熱(re)譜(pu)）的變化(hua)，並(bing)獲(huo)得氧(yang)化(hua)誘(you)導期（時間(jian)）OIT（min)，以評定(ding)塑料(liao)的防(fang)熱(re)老(lao)化(hua)性能(neng)。

和(he)晟差(cha)示掃(sao)描量(liang)熱(re)儀(yi)在(zai)部(bu)分(fen)高(gao)校研(yan)究所(suo)應(ying)用(yong)實(shi)例(li)

部(bu)分(fen)使(shi)用(yong)我(wo)司(si)差(cha)示(shi)掃(sao)描量(liang)熱(re)儀(yi)客(ke)戶(hu)SCI論文

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