JP6330261B2 - ポリマー多孔質膜の製造方法及びポリマー多孔質膜 - Google Patents
ポリマー多孔質膜の製造方法及びポリマー多孔質膜 Download PDFInfo
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- JP6330261B2 JP6330261B2 JP2013113468A JP2013113468A JP6330261B2 JP 6330261 B2 JP6330261 B2 JP 6330261B2 JP 2013113468 A JP2013113468 A JP 2013113468A JP 2013113468 A JP2013113468 A JP 2013113468A JP 6330261 B2 JP6330261 B2 JP 6330261B2
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Images
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Moulding By Coating Moulds (AREA)
Description
t=0.9×(μA/μB)(−1) ・・(式1)
t=0.9×(μA/μB)(−1)・・(式1)
t=0.9×(μA/μB)(−1) ・・(式1)
溶液粘度の測定は、E型回転粘度計で行った。以下に測定手順を示す。
(i)製造例で調製したポリアミック酸溶液を密閉容器に入れ、25℃の恒温槽に10時間保持した。
(ii)E型粘度計(東京計器製、高粘度用(EHD型)円錐平板型回転式、コーンローター:1°34’)を用い、(i)で準備したポリアミック酸溶液を測定溶液として、温度25±0.1℃、回転数1rpmの条件で測定した。
1)膜厚
膜厚みの測定は、接触式の厚み計で行った。
2)空孔率
所定の大きさに切り取った多孔質フィルムの膜厚及び質量を測定し、目付質量から空孔率を下式(2)によって求めた。
(式中、Sは多孔質フィルムの面積、dは膜厚、wは測定した質量、Dはポリイミドの密度をそれぞれ意味する。ポリイミドの密度は1.34g/cm3とする。)
3)通気抵抗
ガーレー値(0.879g/m2の圧力下で100ccの空気が膜を透過するのに要する秒数)の測定は、JIS P8117に準拠して行った。
(ポリマー溶液(A)1、2、3の調製)
500mlのセパラブルフラスコに、N−メチル−2−ピロリドン(NMP)を溶媒として用いて、酸無水物とジアミンのモル比が1:1で、ポリマー濃度が8質量%になるように、ジアミンとして4,4’−ジアミノジフェニルエーテル(ODA)を測り取って投入した。次に、ジアミンに対する酸無水物のモル比が約1となるように、酸無水物として3,3’,4,4’−ビフェニルテトラカルボン酸二無水物(s−BPDA)を測り取って投入した。その後、撹拌羽、窒素導入管、排気管を取り付けたセパラブルカバーで蓋をし、撹拌を開始した。溶液粘度が任意の粘度となるまで、適宜s−BPDAを測りとって投入した。任意の粘度に到達して、粘度が安定したところで安息香酸をポリアミック酸100質量部に対して30質量部の量を計り取って投入して撹拌操作を継続した。30時間後に撹拌を終了し、フラスコ内のドープを加圧ろ過器(濾紙:アドバンテック東洋(株)製:粘稠液用濾紙No.60)でろ過して、ポリアミック酸溶液組成物1、2、3を得た。それぞれの粘度は230、630、880poise(25℃)であった。
(ポリマー溶液(B)1、2、3の調製)
500mlのセパラブルフラスコに、NMPを溶媒として用いて、酸無水物をジアミンのモル比が1:1で、ポリマー濃度が8質量%になり、ジアミンとしてモル比が1:1となるようにODAと1、3ビス(−アミノフェノキシ)ベンゼン(TPE−R)を測り取って投入した。次に、ジアミンに対する酸無水物のモル比が約1となるように、酸無水物としてs−BPDAを測り取って投入した。その後、撹拌羽、窒素導入管、排気管を取り付けたセパラブルカバーで蓋をし、撹拌を開始した。溶液粘度が任意の粘度となるまで、適宜s−BPDAを測りとって投入した。任意の粘度に到達して、粘度が安定したところで安息香酸をポリアミック酸100質量部に対して30質量部の量を計り取って投入して撹拌操作を継続した。30時間後に撹拌を終了し、フラスコ内のドープを加圧ろ過器(濾紙:アドバンテック東洋(株)製:粘稠液用濾紙No.60)でろ過して、ポリアミック酸溶液組成物4、5、6を得た。それぞれの粘度は240、550、820poise(25℃)であった。
表面に鏡面研磨を施したステンレス製の20cm角の基板上に、製造例2で調製したポリマー溶液(B)1を厚さ約100μmで、均一に流延塗布した。次に、1分間、温度23℃、湿度40%の大気中に放置した後、流延塗布されたポリマー溶液(B)1上に、製造例1で調製したポリマー溶液(A)1を厚さ約50μmで均一に流延塗布した。次に1分間、温度23℃、湿度40%の大気中に放置した後、凝固浴(水87質量部/NMP13質量部、室温)中に基板全体を投入した。投入後、8分間静置し、基板上にポリアミック酸膜を析出させた。その後、基板を浴中から取りだし、基板上に析出したポリアミック酸膜を剥離した後に、純水中に3分間浸漬し、ポリアミック酸膜を得た。このポリアミック酸膜を温度23℃、湿度40%の大気中で乾燥させた後、10cm角のピンテンターに張りつけて電気炉内にセットした。約10℃/分の昇温速度で150℃まで加熱し、その後20℃/分の昇温速度で380℃まで加熱し、そのまま3分間保持する温度プロファイルで熱処理を行い、多孔質ポリイミド膜を得た。
ポリマー溶液の種類、ポリマー溶液(B)を流延塗布してからポリマー溶液(A)を流延塗布するまで放置時間F及びポリマー溶液(A)を流延塗布してから凝固浴へ浸漬するまでの放置時間Sを表1に示したように変更したこと以外は実施例1と同様にして、多孔質ポリイミド膜を得た。
得られた多孔質ポリイミド膜の剥離の有無、膜厚み、通気抵抗を表2に示す。表1、表2において、(t)分は式1より算出した値である。
実施例1〜13においてポリマー溶液(A)とポリマー溶液(B)の界面における剥離は観察されなかった。
実施例1で得られた多孔質ポリイミド膜の空孔率を測定したところ78%であることを確認した。実施例5で得られた多孔質ポリイミド膜の表面を走査型電子顕微鏡で観察したところ、ポリマー溶液(A)側の表面には連通する孔を多数有する多孔質構造であり、平均孔径が10μmであり、表面開口率は40%であることを確認した。また、実施例10で得られた多孔質ポリイミド膜の断面を走査型電子顕微鏡で観察したところ、剥離界面は確認されなかった。断面には膜横方向の長さ10μm以上のマクロボイドが多数確認できた。
ポリマー溶液の種類、ポリマー溶液(B)を流延塗布してからポリマー溶液(A)を流延塗布するまで放置時間F及びポリマー溶液(A)を流延塗布してから凝固浴へ浸漬するまでの放置時間Sを表1に示したように変更したこと以外は実施例1と同様にして、多孔質ポリイミド膜を得た。
比較例1〜5において、凝固液に浸漬した際に、ポリマー溶液(A)とポリマー溶液(B)の界面において、水脹れや剥離が発生した。ポリアミック酸膜を乾燥した際、剥離が原因となる皺が多数観察され、剥離のないポリマー多孔質膜は得られなかった。
Claims (4)
- 少なくとも一方がポリアミック酸を主成分とするポリマー溶液である、2つのポリマー溶液(A)及び(B)を、ポリマー溶液(B)、ポリマー溶液(A)の順にフィルム状に積層流延し、流延後に凝固液へ浸漬して多孔質膜を得る工程、及び
前記多孔質膜を熱処理してイミド化する工程
を含むポリマー多孔質膜の製造方法であって、
ポリマー溶液(A)及びポリマー溶液(B)が、それぞれ独立に、p−クロロフェノール、o−クロルフェノール、N−メチル−2−ピロリドン(NMP)、ピリジン、N,N−ジメチルアセトアミド(DMAc)、N,N−ジメチルホルムアミド、ジメチルスルホキシド、テトラメチル尿素、フェノール、及びクレゾールからなる群から選択される1種以上の溶媒を含み、
ポリマー溶液(A)の溶液粘度(μA)及びポリマー溶液(B)の溶液粘度(μB)が、それぞれ、10〜30000poiseであり、
ポリマー溶液(A)が積層流延されてから凝固液へ浸漬されるまでの放置時間(S)分が、ポリマー溶液(A)の溶液粘度(μA)poise及びポリマー溶液(B)の溶液粘度(μB)poiseから(式1)で算出される時間(t)分以上20分以内であることを特徴とするポリマー多孔質膜の製造方法。
t=0.9×(μA/μB)(-1)・・(式1) - ポリアミック酸を主成分とするポリマー溶液が、テトラカルボン酸単位及びジアミン単位からなるポリアミック酸0.3〜60質量%と有機極性溶媒40〜99.7質量%とからなることを特徴とする請求項1に記載のポリマー多孔質膜の製造方法。
- 凝固液が水を必須成分とすることを特徴とする請求項1〜2のいずれかに記載のポリマー多孔質膜の製造方法。
- 凝固液の水濃度が40%以上であることを特徴とする請求項1〜3のいずれかに記載のポリマー多孔質膜の製造方法。
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